<![CDATA[GoldSim Wiki - Page Updates]]>http://www.GoldSim.com/Wiki/Thu, 20 Jun 2013 04:06:03 GMTScrewTurn Wiki RSS Feed Generator<![CDATA[Simulating Multiple Catchments in a Watershed]]>http://www.GoldSim.com/Wiki/Model Library.Simulating-Multiple-Catchments-in-a-Watershed.ashx (jlillywh)Simulating Multiple Catchments in a Watershed (Webinar)

Model Description

This webinar introduced some ways to model the rainfall runoff process in a watershed using multiple catchments. Much of the webinar focused on GoldSim features and GoldSim centric design concepts that are aimed to help users modeling watersheds. This course is not intended to teach you about hydrology but rather how it might be approached in a GoldSim model.

The accompanying model demonstrates 3 different approaches to simulating a watershed with multiple catchments:

  • Localized Containers
  • Cloned Containers
  • Array Functions

Download the Model


Model Screen Shots

The following screen shots are the plots from the model.

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See Also

]]>Fri, 17 May 2013 17:03:38 GMT5BAC9EFEDED09A124EE46A3ED1DFF45C<![CDATA[Introduction to Discrete Event Modeling]]>http://www.GoldSim.com/Wiki/Model Library.Introduction-to-Discrete-Event-Modeling.ashx (jlillywh)Introduction to Discrete Event Modeling (Webinar)

Model Description

Discrete event tools rely on a transaction-flow approach to modeling systems. These kinds of models consist of entities (units of traffic), resources (elements that service entities), and control elements (elements that determine the states of the entities and resources). Discrete simulators are generally designed for simulating processes such as call centers, factory operations, and shipping facilities in which the material or information that is being simulated can be described as moving in discrete steps or packets. They are not meant to model the movement of continuous material (e.g., water) or represent continuous systems that are represented by differential equations.

This Webinar provided a brief introduction to discrete event modeling in GoldSim by first introducing the concepts and then working through a simple example.



Download the Model






Model Screen Shots

The following screen shots are the plots from the model.

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See Also

]]>Fri, 17 May 2013 15:57:29 GMT077777AC46D27AD291242FAA66DB8A05<![CDATA[Modeling Flow Networks in GoldSim ]]>http://www.GoldSim.com/Wiki/Model Library.Modeling-Flow-Networks-in-GoldSim.ashx (jlillywh)Modeling Flow Networks in GoldSim (Webinar)

Table of Contents [Hide/Show]


Model Description

Many customers have asked questions about modeling flow networks that involve moving water in and out of reservoirs and to other locations and we have also seen some users struggle with concepts related to building networks of flows. A Webinar was provided to help users better understand how flow networks are built in GoldSim, how to work with Reservoir elements, and managing the components in an efficient way. The model file and video recording of the Webinar are provided below.

Model Files


Screen Captures

Main model view: Image

Flow Network Model Logic Image

Time History Chart of the Three Ponds: Image



See Also

]]>Mon, 29 Apr 2013 18:20:38 GMTF958093F95CE3813C005EFFC048A9FEC<![CDATA[Recurring Annual Forecast Using a Submodel]]>http://www.GoldSim.com/Wiki/Model Library.Recurring-Annual-Forecast-Using-a-Submodel.ashx (jlillywh)Recurring Annual Forecast Using a Submodel

Table of Contents [Hide/Show]


Model Description

This model demonstrates the use of a submodel to perform an annual forecast in order to allocate water supply at the beginning of each year. The main model simulates a reservoir that delivers water to both downstream water demands and to fulfill instream flow requirements. This model runs for many years. At the beginning of each year (each October), a forecast submodel runs to find out if the demand should be curtailed to prevent draining the reservoir too far. When the forecast predicts a low minimum storage level, the demand is cut in half for the year. Another forecast is done the following October and the process is repeated, each year of the main model. The logic in the submodel is essentially an exact duplication of the logic in the main model.

Realization 1 = with forecast

Realization 2 = without forecast

Note this model assumes perfect foresight on the coming year's streamflow. For a real project, you might run a probabilistic forecast to use risk as the factor for defining the next year's water supply allocation.

Model Files

  • GoldSim version the model is saved in: Version 10.5 SP3
  • file name: Annual Demand Projection Submodel.gsm
  • Download: GoldSim Model File

Screen Captures

Main model page: Image

Forecast model results chart:

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See Also

]]>Thu, 18 Apr 2013 15:14:12 GMT26E7E6783AF5168698B3423A573D5788<![CDATA[Depreciation Methods]]>http://www.GoldSim.com/Wiki/Model Library.Depreciation-Methods.ashx (goldsim)Depreciation Methods

Description

This simple model depreciates an asset using three different methods: straight line, double-declining balance, and MACRS (Modified Accelerated Cost Recovery System).

Download the model file


See Also

Other Business and Financial models

]]>Wed, 17 Apr 2013 23:31:59 GMTB755E1DD9C51775B57738F76FC5A722A<![CDATA[Indexing Historic Records]]>http://www.GoldSim.com/Wiki/Model Library.Indexing-a-Historic-Record.ashx (jlillywh)Indexing Historic Records

Table of Contents [Hide/Show]


Model Description

The purpose of this model is to demonstrate the time-shifting capability of a GoldSim time-series element. A time-series element contains nearly 90 years of streamflow data from the USGS Provo River gauge located in Provo, Utah (modified USGS gage data 1923-2010). The model was set up with a simulation duration of 1 year, repeated 100 times for Monte Carlo, probabilistic simulation. As the model iterates through each realization, the Provo River time-series record is re-sampled at a random year always starting at the day and month set in the simulation settings of the model. This type of model makes it easy to show summary statistics like exceedence probability of annual peak flow rate or mean annual flow rate.

Download the Model





Model Screen Shots

The following screen shots are the plots from the model.

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See Also

]]>Wed, 17 Apr 2013 23:04:42 GMT41FE605BCB65D8DDDBA5E8D2B1F10030<![CDATA[Discrete Simulation of Profit Made from Shipping Cargo]]>http://www.GoldSim.com/Wiki/Model Library.Discrete-Simulation-of-Profit-Made-from-Shipping-Cargo.ashx (jlillywh) Discrete Simulation of Profit Made from Shipping Cargo

Model Description

This model simulates the process of cargo shipments entering a port, purchasing the cargo, shipping the material to another port and then selling the material to be exported. Material moves through this system as discrete amounts with delays at each point. Delays are used for material handling and for transport. Material can be shipped via train or semi truck at different unit costs and load capacities.

Also, the cost of purchasing imported material and shipping material is accounted for. The sales revenue of exports is used to track the cash flow. Once per month, deposits are made to an investment fund to maximize profits. The model is run as a Monte Carlo simulation to determine the profits probabilistically.

Uncertainty is defined at the imports and exports to/from the ports and also the interest rate applied to the investment fund.

Download the Model




Model Screen Shots

The following screen shots are the plots from the model.

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See Also

]]>Wed, 17 Apr 2013 22:58:16 GMT6EAA22E1926C0ADA762A40424067D2E0<![CDATA[Pollution Caused by Leachate from Spoil Heap]]>http://www.GoldSim.com/Wiki/Model Library.Pollution-Caused-by-Leachate-from-Spoil-Heap.ashx (jlillywh) Pollution Caused by Leachate from Spoil Heap

Model Description

This model simulates the process of rainfall runoff through a spoil heap leaching pollutants to a recieving water body. The rainfall runoff process is calculated using very simplistic assumptions that should be modified for use on a real project.

The amounts of water and spoil sediments, along with associated contaminants are calculated as the material moves from the spoil heap to a river. The model is run as a Monte Carlo simulation to determine the probability of peak concentration and contaminant loading amounts in the downstream river.

Download the Model




Model Screen Shots

The following screen shots are the plots from the model.

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See Also

]]>Wed, 17 Apr 2013 22:56:38 GMT9681C26A3163C82832EA0B391B653AB2<![CDATA[Test Page]]>http://www.GoldSim.com/Wiki/ (jlillywh)Mon, 15 Apr 2013 15:04:10 GMT851406FF2E8D392D214E8D6C66C3BCD0<![CDATA[Modeling with Time Series Data in GoldSim]]>http://www.GoldSim.com/Wiki/Model Library.Modeling-with-Time-Series-Data-in-GoldSim.ashx (jlillywh)Webinar: Modeling with Time Series Data

Model Description

This model was created during a webinar that covered an introduction to the time series element. Time Series elements provide a very flexible and powerful way to input external time histories of data into GoldSim. You can use a Time Series element to input the predefined histories of things like interest rates, commodity prices, temperature, rainfall rates, sales rates, cash flows, or the condition (reliability, strength) of a machine or a material. A Time Series element represents an exogenous (external) “driver” that can directly or indirectly influence the dynamic behavior of the system being modeled.

The time series element is feature rich and thus has the potential to cause confusion if not fully understood. It is important that our users learn how to use this element before implementing time series elements in project models. This webinar will introduce you to the basic features of time series element, followed by the more advanced features, including the items shown in the list below:

  • Data sources
  • Defining how the data is represented
  • Defining the primary output
  • Rate of change
  • Time shifting
  • Enable multiple series
  • Importing time series from another model
  • Referencing time series output

Download Files




See Also


]]>Wed, 03 Apr 2013 21:28:55 GMT46BDBCF350A84CF820D8076BEFDC39E4<![CDATA[Linking GoldSim to Excel Spreadsheets]]>http://www.GoldSim.com/Wiki/Model Library.Linking-GoldSim-to-Excel-Spreadsheets.ashx (jlillywh)Linking GoldSim to Excel Spreadsheets Webinar

Model Description

This webinar served as an introduction to the Spreadsheet element. A Spreadsheet element allows you to dynamically exchange data with a Microsoft Excel spreadsheet file. You can transmit data into specified cells in the spreadsheet, have the spreadsheet recalculate, and copy data from "result" cells back into your GoldSim model. Alternatively, you can simply use a spreadsheet as a source of input data to GoldSim, or as a repository for output data.

The following concepts were covered in this webinar:

  • Defining the Spreadsheet element properties
  • Exporting data to a spreadsheet
  • Importing spreadsheet data to GoldSim
  • Defining offsets and shifting ranges in a spreadsheet
  • Locking onto a file
  • Controlling when GoldSim exchanges data with the spreadsheet
  • Exchanging date information with a spreadsheet

Download Files




Screen Captures

Model Screen Capture: Image



See Also

]]>Wed, 03 Apr 2013 20:53:25 GMT4FFA1E2C63A528339AF41151CEA8AB2D<![CDATA[Script Element - Advanced Functions]]>http://www.GoldSim.com/Wiki/Model Library.Script-Element-Advanced-Functions.ashx (jlillywh)Script Element - Advanced Functions Webinar

Model Description

This model was created during a webinar that covered an introduction to the script element, followed by writing more advanced scripts in GoldSim using the Script element. The following concepts were covered in this webinar:

  • Variable definition and assignment
  • IF-ELSE statements
  • Looping structures: FOR, DO, WHILE
  • BREAK and Continue statements
  • Comments
  • Logging warnings and messages
  • Using Scripts in context of real projects

Download Files




Screen Captures

Model Screen Capture: Image

See Also

Example Models in the Model Library


Related Topics in the Forum



]]>Wed, 03 Apr 2013 20:12:54 GMTAC6A8FFB2E6C2D6A51F9C66E282FBE54<![CDATA[Linking a Lookup Table to an ASCII Text File]]>http://www.GoldSim.com/Wiki/Model Library.Linking-a-Lookup-Table-to-an-ASCII-Text-File.ashx (jlillywh) Linking a Lookup Table to an ASCII Text File

Model Description

The purpose of this model is to demonstrate the Lookup Table data source function that imports data from a text file. The data is imported at the beginning of the simulation. This topic is well documented in the GoldSim Help File. Find this information by clicking on the Help button and typing the keywords “lookup text” in the search field or by browsing the Contents to the following location:

  • Using the GoldSim Elements
  • Using Basic Function Elements
  • Lookup Table Elements
  • Defining Lookup Table
  • Linking a Lookup Table to External Data Source
  • Linking a Lookup Table to a Text File

In this model, the lookup table data represents a time series. Note - the best way to represent time series data is with a Time Series element but since that element cannot import directly from a text file, the Lookup Table is the second best option for doing this.

Model Files


See Also


]]>Wed, 03 Apr 2013 16:32:35 GMT798FEF5736276B78137B56168F05AB1D<![CDATA[Linking a Lookup Table to an ASCII Text File]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Link Lookup Table to Text File.docx]]>Wed, 03 Apr 2013 16:27:46 GMT62360E1BB9542E57760C0E5DE2AA66F1<![CDATA[Mass Balance Accounting for a Reservoir]]>http://www.GoldSim.com/Wiki/Model Library.Accounting-of-Inflows-Outflows-and-Change-in-Storage-at-a-Reservoir.ashx (jlillywh)Mass Balance Accounting for a Reservoir

Model Description

It is important that you correctly account for flows in and out of reservoirs in GoldSim models, especially when events are occuring between time steps (for overflows, etc.). The approach used in this model accounts for all flows that occur on and off the scheduled time step change. If the flows are not balanced, a runtime error is issued to inform the modeler.

A simple reservoir model is used to employ the mass balance checking functions (see the container called "MassBalance_Check". The Mass Balance container includes the functions that account for flows and volumes to ensure there is mass balance. If the mass balance error exceeds a criteria specified, then an error message is displayed and the simulation is interrupted. You should expect to see a very small amount of error.

Download the Model




Model Screen Shots



Image



See Also

  • http://en.wikipedia.org/wiki/Mass_balance

]]>Wed, 27 Mar 2013 19:46:23 GMT72C580C479B6EAE19C0E24CED8E7FC48<![CDATA[Accounting of Inflows, Outflows, and Change in Storage at a Reservoir]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Mass Balance Checking.docx]]>Wed, 27 Mar 2013 19:34:08 GMT39F12FE40D8E26562E6E0B5790E29DD7<![CDATA[Population Growth - “Aging Chain” Model]]>http://www.GoldSim.com/Wiki/Model Library.Population-Growth-Aging-Chain-Model.ashx (jlillywh) Population Growth - “Aging Chain” Model



Model Description

This example shows how GoldSim can be used to model the dynamics of a population of individuals or cohort groups. Each 1-year age group of a population of individuals (ages 0 to 99) is modeled using a vector of discrete amounts added to an Integrator element. The discrete amounts (MaleAnnual and FemaleAnnual) are used to replace the contents of their associated Integrator elements, which are also defined as vectors of age groups. Every time the Discrete Changes are updated, they replace the contents of the Integrators with the value of the Integrator but using the previous row of the vector. The very first row of the Integrator vector is given the value of the number of births for males and females.

This process allows the population of each group to be passed from one row to the next during the simulation, which can be thought of as an aging chain model. The female population provides births that are entered into the Discrete Change elements that eventually work their way into the population as well. Populations are reduced using a survival rate input, which decreases as the group aproaches age 100. The age groups are aggregated into cohort groups of “Young Dependents”, “Working Age”, and “Retired Age”.

To edit initial population data or survival rates press the 'Edit Initial Population' button or the 'Edit Survival Rates' button to the left. In either case, the properties dialog for a data element will be displayed. You can press the 'Edit...' button and enter new values. Fertility rates can be edited by pressing the 'Edit Fertility Rates' button. This will display the data entry table of the fertility rates lookup table where you can enter new values.

After running the simulation by pressing the 'Run Simulation' button at the top of the dashboard, you can view various results by pressing the buttons to the left. You can view time histories for total population, total population by decade, and female/male populations by decade.

Download the Model File

  • GoldSim Version the model is saved in: 10.5 SP3





Model Screen Captures

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See Also


]]>Tue, 26 Mar 2013 18:59:25 GMT0ED48FF23DC5A5DAED672B14F032054F<![CDATA[Population Growth - “Aging Chain” Model]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from AgingChainModel_Description.docx]]>Tue, 26 Mar 2013 18:55:43 GMT4033D8D2757E5DF6868DD7709C73BB13<![CDATA[Examples of GoldSim's New Script Element]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Examples of GoldSim's New Script Element.docx]]>Fri, 22 Mar 2013 21:32:20 GMT81E3DBE571C3E31C452873A2DDE8E080<![CDATA[Shifting Time Series Data - Using Historic Data in Predictive Models]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Shifting Time Series Data.docx]]>Fri, 22 Mar 2013 19:41:25 GMT118B1902FDE1C68AD8E2CD273E564952<![CDATA[An introduction to Resources]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from An introduction to Resources.docx]]>Fri, 22 Mar 2013 19:24:26 GMT8E4763C64B3265A032F542621F650AEF<![CDATA[Little-Known Tricks for Quickly Inserting Links]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Time Saving Tips for Inserting Links.docx]]>Fri, 22 Mar 2013 19:15:03 GMT18EA3CA1651DB0999D4E1F7C02A43375<![CDATA[A-Surfacing-Diving-Bell ]]>http://www.GoldSim.com/Wiki/ (jlillywh)Fri, 22 Mar 2013 18:32:02 GMT9B53B13399BCB6DA9802FEE556A3A982<![CDATA[Learn How To Use GoldSim]]>http://www.GoldSim.com/Wiki/ (jlillywh)Fri, 22 Mar 2013 18:28:44 GMT2EA2E21B953D89AB86BAA016A624201B<![CDATA[Using the Script Element to Manipulate Vector Data]]>http://www.GoldSim.com/Wiki/Model Library.Using-the-Script-Element-to-Manipulating-Vector-Data.ashx (jlillywh)IntroductionIn this article we will demonstrate how to use the script element to create a new vector from a segment of a host vector. We will use a similar method to carryout mathematical operations on the data inside a vector to create a new results vector. The conceptual operations contained in this article are illustrated in the figure below. 

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Model Description

In this example we will extract a range of 1,000 values from a host vector containing 10,000 values. Using the extracted values, we will sequentially sum every 100 items to calculate a summary vector containing the results of each of the 10 sum operations. The first step of extracting a range of values is very simple, only requiring the input or host vector and a starting index.

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Looking inside the script element shows a simple for-loop copying each item in the specified range. Less obvious is that the script size defines the upper bound of the vector.The script logic is essentially saying: start at a specific index position and stop when the vector is full. Note the values in the script element are initialized to zero using a vector constructor shown in the Initial Value field of the figure below.  

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The next step is to perform sum operation for each group in the extracted vector. This is done by adding another script element which will perform the operation and connect it to the existing script element as the input.  

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Looking inside the new script element shows a nested for-loop used to first break the extracted vector in groups or blocks and a second loop to perform the mathematical operation and store the calculated values.

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Model Limitations

Vectors cannot be created during run-time and as such must be statically predefined using array labels.  Labels must be created for the extracted and results vectors. The number of items in the summary vector must divide evenly into the number of items in the extracted vector.  

Related Model Library Articles


Related Topics in the Forum


See Also


Other Resources

]]>Fri, 22 Mar 2013 18:21:26 GMT13CF54952EFDB2445571F61B495AD7EC<![CDATA[How To Post a Model ]]>http://www.GoldSim.com/Wiki/Model Library.HowToPostAModel.ashx (jlillywh)How to Post a Model in the Model Library Thank you for considering a contribution to the GoldSim Model Library! Your contribution will benefit the modeling community with a unique and valuable model example. It will also benefit your modeling career by further establishing your name as a resource for other modelers in the community.

When you post a new model to the Model Library, you need to accomplish two things: 1. Write a brief article with a title, description, references, and screen capture images (optional), and 2. Upload your model. These two things comprise a basic model library article.

To contribute a model to the Model Library, please follow the instructions below:

Prepare Your Model for Publication

The goal is to prepare a fully functional GoldSim model along with a player version of the model, including any supporting files required for your model to run (i.e. spreadsheet files, external files). These files will then be made available to the public for download and use.

It is best that you consider good design practices when developing and documenting your GoldSim models. Try to organize your model so that major themes are organized into categories. An example is shown with the following categories:
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  • Input data
  • Functions
  • Results
  • User interfaces (dashboards)

If your model includes supporting files such as spreadsheets and external files, document what these files are and how they are used in the model. One way to document supporting files is to write a summary inside the GoldSim model using text editor components.

In the main page of the GoldSim model, provide a summary of the model or a link to a page that provides a basic summary. The summary should include the purpose of the model, the model assumptions, criteria, basic methods used, and a short description of the results. This model summary can be used for the summary in the wiki model article as well.

Go through the model and make sure it would be understandable to other users that have not seen your model before. Descriptions within the model elements are always helpful and sometimes additional commentary outside the element is helpful. Use the graphical editor in GoldSim to draw a basic schematic drawing of the system you are modeling if you think this will add value to the documentation.

Wait until all editing is complete before creating the Player version of the model to ensure the models are identical.

If you have support files that support your GoldSim model, zip the files into a single file (one for the fully functioning model and another for the player model).



Sign into the GoldSim Wiki and Create a New Page

Browse to the GoldSim Wiki and sign in.
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In order to register for an account or upload model files to the GoldSim Wiki, you must be a Certified User. If you do not have this status yet, email us at  and we can help you with the application process. You can create a new account by first clicking on the Login button then follow instructions to create a new account.  Once you are logged into your account, you should see the Welcome statement say, Image

You should now see your user name appear where it used to say "Welcome Guest,...". Now that you are logged in, navigate to the Model Library, where you can upload a new model. To do this, click on the drop down selector next to your user name and select "Model Library". Currently, the selection should say "root". Whenever you are searching the model library or uploading your own model, you should always be in the "Model Library" namespace. You should now see a screen with the heading,

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Once inside the Model Library, it is recommended that you spend some time perusing the models in the Model Library to see the types of models already uploaded and also to get a feel for how these articles are formatted and organized. On the left side of the page, there is a Navigation box with a list of options, including one to create a new page. Click on "Create a new page". A new web page will appear with a dialogue box for the page title and the model summary article (see image below).
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Fill in the Page Title using a name that adequately and succinctly describes your model. By default, the Page Name (used for linking from other pages) is a modified version of the Page Title (spaces are removed). You can change the Page Name by clicking on "Specify page name manually... " and specify a custom Page Name. This Page Name will not be visible to users but is just used as a bookmark for linking pages. This is only recommended for article names that are very long.

You are now ready to compose the body content of your wiki article.

Write the Page Content

You can either write your article using WikiMarkup or Visual formatting. Switch to one or the other by clicking the tab at the top of your editor. Sometimes, it is easier to use the WikiMarkup formatting option during composition because you can enter information consicely and simply. Once you have some information in the editor, you can view the contents by clicking the "Visual" tab or the "Preview" tab. After the basic structure of your article is developed, it might be easier to edit using the "Visual" formatting mode. For the purposes of this tutorial, it is assumed that it will be written in the WikiMarkup formatting mode. WikiMarkup is a specific language used to write wiki pages on the internet. Certain characters represent formatting displayed on the website. Below is a list of some major formatting types created using WikiMarkup:

  • surround text with 3 apostrophes creates bold font 
  • surround text with 1 apostrophe creates italicized font
  • surround text with 5 '=' signs creates =====heading level 4=====
  • a single asterisk will create a bullet

For more information about the WikiMarkup syntax, refer to WikiMarkup documentation

Typically, there are 4 sections in the article, which include:
  • Table of Contents (and author name and email address)
  • Model Description
  • Screen Grab Images
  • References

Before you begin editing, make sure the "WikiMarkup" tab is highlighted by clicking on it. 

First, add a title for the article in the main editor window by typing the words of the title then highlighting the text and hitting the H2 button located above the editor. As an example, if you type the words, "Municipal Demand Model" then change the text to a level 2 heading, you should see three '=' signs be added to either side of the text to become: "===Municipal Demand Model===". The three equal signs surrounding the text indicate H2 heading in WikiMarkup language. By clicking on the "Preview" tab, you can see how this would look after the page is published.

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To add a table of contents, click the "special tags" button that looks like this: {-}.  A list of options should appear, including {'TOC}. Click on that option and the characters {'TOC} will appear in your editor. The {'TOC} statement will auto-generate a table of contents for you based on your headings entered into the article. Your article should appear as shown in the image to the right. Alternatively, you could just type the characters "{'TOC}" (without the apostrophe before the T) into the WikiMarkup editor.





Click the Save button at the top right (above the editor) and the page will appear as it will be published for the world to see. You should see something similar to the image shown below:
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Add the model description to your page content by typing the words "Model Description" and then changing the formatting of this text to Heading level 3 by clicking on the "H3" button above the text editor. Following the Model Description heading, begin typing your model description or copy and paste the text from another editor. After you finish this, click Save and preview the results. The revised article should look something like this: Image

Add a Model Download Section

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Before adding a link to your model files, you need to first upload the files to the web server. To do this, go to the section at the bottom of the page (below the wiki text editor) and click on the "Browse" button and find the file you would like to upload. If you have files linked to your GoldSim model (i.e. spreadsheet file), make sure to zip them up into a single file before uploading to the site. Once you find your file and enter it, you need to hit the upload button to save it to the server. Once this is done, the name of your file will show up under the Page Attachments Management section, showing the name, size, and the option to rename or delete the file.

Once you have the file uploaded, the link can be made. Create a new section called, "Download the Model" using Heading level 3 "H3" style. Typically, the following information is included in this section for each model that is uploaded:
  • GoldSim Version:
  • File size:
  • File name:
  • Download link:

To add bulleted information, it is best to switch to Visual formatting and click on the "bullets" button. Fill out the first three by hand then paste the link to the model file by clicking on the link file button above the text editor. Image

When you click this button, a new window pops up with a check box titled, "Browse Page Attachments". After checking the box, the filename of the file you uploaded will appear in green. Click on the name and the file path will automatically appear in the File Path dialog box. You can enter an alternative title for the file in the "Link Title" dialog box if you wish. Do this for a player version and full version of the model.

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Click "OK" and the file link will appear in the text editor for your article. If you click Preview, you should see your page look similar to the example shown below. Image

If you would like your model title and link to be included in the "Most recently added models" section of the Model Library Main Page, email the and let GoldSim staff know that you have added a model article.



Add Model Screen Capture Images

It is usually helpful to include a couple of screen capture images of the model and/or result plots to give people a quick idea of what to expect from your model. Adding an image is similar to adding a link to your uploaded model files. The first step is to capture the model screen image using a screen capture software or the "Print Screen" option on your keyboard. If the latter is used, crop the image so that only the window showing relevant information is visible then re-save the image file. Upload a new image to the web server by clicking on the "Browse" button below the text editor in the "Page Attachments Management" section. After your image is uploaded, the file name will be added to the list of files.

Add a sub-heading (level 3, H3) called, "Model Screen Capture Images". You will then add image file(s) just below this sub-heading.

Go to the location in the text where you would like to add the image file and click the "Insert Image" button. Image A new window will appear with a check box called "Browse Page Attachments". Check that box and the filenames of any images you have uploaded will appear in this window. Select the image you would like to include and hit "OK". The link to your image will appear in the text editor. Your new article section should appear similar to the image below.

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Add References

It is helpful to add references so other people can learn more about the methodology implemented in your model and/or see related articles and models. Create this section by writing the name of the section, "See Also" with the H3 formatting applied.

To add a link to related wiki articles, click on the "insert wiki link" button. Image

To add a link to another website, click on the "insert internet link" button Image

For More Information

For more information about how to edit the Wiki, please refer to: ]]>Fri, 22 Mar 2013 18:18:41 GMTC085F32160646CFE25D86AB2929143D5<![CDATA[Run GoldSim from the Windows Command Line Using a Batch File]]>http://www.GoldSim.com/Wiki/Model Library.Batch-File.ashx (jlillywh)Batch File Example

Description

This example file includes two simple batch files. They are both saved in .txt extensions so that you can look at the commands in any text editor.

RunGSExamples.bat

This batch file opens two model files in the General Example folder in Program Files (installed together with the application), run and close them without saving them.

To run this file, delete .txt from the file name, and double click on it.

BatchFileExample.bat

This batch file runs BatchfileExample.gsm, found in the same zip file, three times with different input data and export the results to three separate spreadsheets.

To run this file, open the BatchFileExample.bat.txt using Notepad. Modify the file location in the second command line (underlined below) and save the change.

start /wait goldsim.exe -sv R1.gsm -x "C:\Users\xxxxxx\Desktop\Batch file Example\BatchfileExample.gsm"

Delete .txt extension from the file name, and double-click it to run the batch file.

Download the model file


See Also

]]>Fri, 22 Mar 2013 18:18:11 GMTBF534E7A5DE7ED7E28A7C331FECF1F2A<![CDATA[Municipal Demand Model]]>http://www.GoldSim.com/Wiki/Model Library.test_page.ashx (jlillywh)Municipal Demand Model

Table of Contents [Hide/Show]


Model Description

The consumption of water (a.k.a. water demand) is the driving force behind the dynamics occuring in many water resources systems. Two basic questions need to be answered when building a water resources model that includes municipal water demand: 1. How much water is being used and 2. How does the usage change as a function of time? Water demands are often quantified using a unit of demand per capita applied to a seasonal factor. In this model, indoor and outdoor water demands are calculated using per unit water demands and a seasonal factor that is applied using a lookup table.

Download the Model

  • GoldSim Version: 10.5
  • File size: 92 KB
  • File name: sample_demand_module_wiki.gsm
  • Download link: Municipal Demand Model


Model Screen Capture Images

The following screen shots are the plots from the model. Image

See Also

FAO Penman-Monteith Crop ET

USGS Public Water Supply ]]>Fri, 22 Mar 2013 18:12:22 GMT1734F0618B5D5298C60FFC2E3E232490<![CDATA[Vector and Matrix Constructors]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Vector and Matrix Constructors.docx]]>Fri, 22 Mar 2013 17:38:51 GMT8AFD6F7995B3DB45128894EC8C89DF76<![CDATA[Demystifying Triggering]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Demystifying Triggering.docx]]>Fri, 22 Mar 2013 17:26:28 GMTEF0993B607E58D756D9F8A24BA28B820<![CDATA[Using Importance Sampling to Model High-Consequence, Low-Probability Outcomes]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Importance Sampling for High-Consequence, Low-Probability Outcomes.docx]]>Fri, 22 Mar 2013 17:08:21 GMTD1E46C80D4D4AEF728557BB870FE00B2<![CDATA[Using the Status Element to Track Boolean State Variables]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Using the Status Element to Track Boolean State Variables.docx]]>Fri, 22 Mar 2013 16:56:56 GMTCC25714FDC8C631A35B5CE4561BF6867<![CDATA[Private_wiki_Page]]>http://www.GoldSim.com/Wiki/ (GoldSim)Fri, 22 Mar 2013 16:30:36 GMT300DACB00E09BFDB981C5C31ED45226A<![CDATA[User-Defined Fonts on Dashboard Controls]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Fonts in Dashboard Controls.docx]]>Fri, 22 Mar 2013 16:22:58 GMTDD8A395205CBBC854F91BABC8A1618BF<![CDATA[Running Models Using Calendar-Based Timesteps ]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Running Models Using Calendar.docx]]>Fri, 22 Mar 2013 00:22:59 GMTB8BDA98A33B8B6473BE2FF258CC7F3CC<![CDATA[Time Shifting Values in a Time Series with User-Defined Functions]]>http://www.GoldSim.com/Wiki/Model Library.Time-Shifting-Values-in-a-Time-Series-with-User-Defined-Functions.ashx (jlillywh)Time Shifting Values in a Time Series with User-Defined Functions
The time series element in GoldSim version 10.5 SP2 provides the ability to perform time shifting of data using Monte Carlo realizations. On each realization, GoldSim will pick a random starting point in the data set.

Many users have requested the ability to perform time shifting using user-defined functionality instead of letting GoldSim pick randomly. A model example demonstrating a couple of approaches is proved below. The two approaches are:

  • Use a time series element to randomly choose a start date
  • Use a 2D lookup table to select the value based on a random start year and the current month

Download the model file

  • GoldSim version the model is saved in: Version 10.5 SP3
  • file name: Index Historic Records Using 1D or 2D lookup tables
  • Download Model File
  • Download Player Model File



See Also

]]>Thu, 21 Mar 2013 23:31:37 GMTE9FC5AF76A567572A7CE6A97DE4763A6<![CDATA[Pollution Caused by Leachate from Spoil Heap]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Spoil Heap Runoff.docx]]>Fri, 08 Mar 2013 19:45:31 GMT5449B5CF1902C6DE60B9B425A955F656<![CDATA[Simulating a Water Conservation Program]]>http://www.GoldSim.com/Wiki/Model Library.Simulating-a-Water-Conservation-Program.ashx (jlillywh) Simulating a Water Conservation Program

Model Description

This model simulates the reduction of water deliveries under a water conservation implementation plan. It is assumed that conservation measures are funded by the water supplier using funds driven by water demands, which creates a feedback loop in the model. Water demands drive the income for the supplier to provide the conservation measures. Increases in conservation also causes the net revenues used to pay for conservation to decrease.

Estimating Housing Growth

This subroutine estimates growth in population as a measure of housing units, which are divided into types of dwellings like single family houses and various sizes of apartment buildings. The growth is estimated using a History Generator, which generates stochastic time histories of variables. A stochastic time history is a random time history that is generated according to a specified set of statistics. This history generator is set to use a "random walk" to generate a random time history of housing demand, which influences the growth of units.

Estimating Cash Flow for a Conservation Program

This subroutine keeps track of the cash flow for a governing entity that is providing conservation vouchers to the populace at a cost to the entity. It is assumed that revenues are generated using a tax structure on the population and is suplemented by a 3rd party (to further promote conservation). If the cash flow approaches zero, conservation measures are reduced in the water conservation routine.

Estimating Water Conservation

This subroutine simulates the rate of implementation of conservation measures, which is partially a function of the cash flow of the governing entity that oversees conservation. It is assumed that these measures have an expiration, which means that eventually, a home owner could revert back to a non-conservation type fixture in the future causing the total number of accumulated measures to be reduced in the population. Additional measures must be added to overcome the expiration losses. This is done using a reservoir element.

Estimating Water Demand

This subroutine estimates the total water demand before and after conservation measures are applied. Water demand is a function of an assumed unit demand rate and the current population size.



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Model Screen Shots

The following screen shots are the plots from the model.

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See Also

]]>Fri, 08 Mar 2013 17:28:14 GMTD3CB77E57DBA829AA18FD2A2DAFC7EDC<![CDATA[Test Page]]>http://www.GoldSim.com/Wiki/ (goldsim)Imported from Water Conservation Model Description.docx]]>Fri, 08 Mar 2013 17:06:52 GMTD2A500D6C01DB7E3FA9391E0BB45010A<![CDATA[Simulating a Water Conservation Program]]>http://www.GoldSim.com/Wiki/ (jlillywh)Fri, 08 Mar 2013 16:51:29 GMT03764B94D32BE6C68FC53795E1EFBAC3<![CDATA[Discrete Simulation of Profit Made from Shipping Cargo]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Shipping Cargo Model Description.docx]]>Fri, 08 Mar 2013 01:10:52 GMT74D536D6A9C8B4997F50419DCE08417F<![CDATA[FAO Penman-Monteith Crop ET]]>http://www.GoldSim.com/Wiki/Model Library.FAO-Penman-Monteith-Crop-ET.ashx (jlillywh)FAO Penman-Monteith Crop ET

Table of Contents [Hide/Show]


Model Description

This model uses a weather generator to develop a time series of meteorological variables necessary for crop evapotranspiration (ET) demand calculation. The weather generator runs, then ET reference is calculated, then ET_crop is calculated based on the relative ET demands of different crops. The output, a daily time series of crop ET rates, which can be used to calculate irrigation requirements. The calculations, without the weather generator, follow those outlined in the FAO Crop evapotranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage paper 56 (http://www.fao.org/docrep/x0490e/x0490e00.htm).

Instructions

1) Enter the \Weather_Generation\WGEN_Temp_Rad_Precip\Inputs container and fill out the inputs for the WGEN weather generator. These are inputs necessary to simulate precipitation, solar radiation, and maximum and minimum temperature.

2) Enter the \Weather_Generation\Relative_Humidity_Inputs container and enter the most likely relative humidities for dry days and wet days. These are used in simulating relative humidity from a triangular distribution.

3) Enter the \Weather_Generation\Wind_Generator_Inputs container and enter the daily mean wind speed. This is used in generating daily wind speeds from an exponential distribution.

4) Enter the FAO_ET_Inputs container and enter the elevation of the site and the height at which wind was measured in coming up with the daily mean value. Elevation of the site is used for an approximation of pressure, and wind measurement height is used to come up with an estimate of wind speed at 2 m high.

5) Enter the Inputs_for_ETCrop container. These are the variables that need to be adapted to calculate the evaporative demand of different crops. The variables are the times in different growth stages and the Kc factors during those stages. This is currently a demonstration model with two crops. You will likely have more crops and will have to edit the Crops array label set to include all crops of interest.

Download the Model


Model Screen Shots

The following screen shots are the plots from the model.

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See Also

]]>Fri, 01 Mar 2013 22:11:00 GMT8B31CACC2DABC427D1AF82C5BE616DA1<![CDATA[Hydraulic Grade Line Through Adjustable Outlet Works]]>http://www.GoldSim.com/Wiki/Model Library.Hydraulic-Grade-Line-Through-Adjustable-Outlet-Works.ashx (jlillywh) Hydraulic Grade Line Through Adjustable Outlet Works

Model Description

This model is used to simulate a reservoir with an outlet tower containing 4 outlets at various elevations and sizes, which can be opened or closed in any combination. In addition, discharge water is released through a long pipe that is terminated by a cone valve, which discharges to atmosphere. This model uses a Script element to calculate the flow rate through the following hydraulic structures:

  • Adjustable orifices in parallel
  • Pipe segment
  • Cone valve

The flow rate is calculated as a function of the total head on the system, which is a function of the flow, so this is a coupled problem that requires an iterative solution. A binary search DO loop is employed to solve for the flow at each point in time during the simulation. The hydraulic grade line elevation (HGL) at the outlet is the boundary condition for this problem and is assumed to be the invert of the pipe at the outlet. An initial guess flow rate is also used at the beginning of the DO loop. From the outlet working upstream towards the reservoir, the headloss at the cone valve is calculated, followed by pipe friction loss through the pipeline, then the headloss through a combination of parallel orifices at the outlet tower. Refer to the images below for an illustration of the system components and how they interact.

At the outlet, we have to look at each one to determine how much water can flow through it and also determine whether the orifice is submerged or not. Once this is determined, we calculate the total loss through the parallel orifices and then sum up all losses from start to finish. Given the total headloss calculated, we now calculate the resulting flow through the orifices. The binary search function will then step closer to the correct flow rate based on how the guess flow compares to the flow calcuated based on total head.



Download the Model


Model Screen Shots

The following screen shots are the plots from the model.

Dashboard for the model:
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Time History Chart of the Head in the Tower Over Time Compared to the Outlet Levels
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Discharge Hydrograph at the Outlet of the System
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See Also

]]>Thu, 28 Feb 2013 23:20:27 GMT9283B00706168E67B51C114C76D5D844<![CDATA[Hydraulic Grade Line Through Adjustable Outlet Works]]>http://www.GoldSim.com/Wiki/ (jlillywh)Imported from Hydraulic Grade Line Through Adjustable Outlet Works.docx]]>Thu, 28 Feb 2013 23:16:51 GMT998C816373EDB2557A01667E0F8707B7