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Getting started with the Simile System Dynamics simulator on DICE

Running SIMILE


The easiest way to run Simile on DICE is to use my installation:
Before you start you need to get set up with Simile. Create a folder to work in on your DICE account, say "cmgcr" (you will need 4MB disk space). Execute the following commands (all are single-line commands):

# change to the working direcotry
cd cmgcr
# copy Simile runtime files to your own space
cp -r /afs/inf.ed.ac.uk/user/n/ngoddard/public/Simile-cmgcr Simile
# put the Similer executable on your path
export PATH=`pwd`/Simile/Run:$PATH

Now you you can run Simile with:


simile

Note if you log out and log in again, you will need to do the export command again. Or you could put the export command in your .bashrc or .cshrc file so that it happens automatically when you log in.

You can also download an evaluation version of Simile from the Simulistics website:


http://www.simulistics.com

Getting started with SIMILE models

Start with the tutorial models. These are available from the Help menu on the Simile interface. Three are also available on the web here. You can also print these three out using the PDFs at the same location.

ECCO modelling with SIMILE

Create the basic industry production model according to the following diagram:

Simile industry diagram

Set the initial values and equations as follows:


industrial_HMC = 1000
industry_depreciation_rate = 0.2
industry_productivity = 1.5
investment_in_industry = 100
industry_depreciation = industry_depreciation_rate * industrial_HMC
industry_output = industry_productivity * industrial_HMC

Use Model|Run to get the runtime dialog. Add a time series plot for industrial HMC and run the model for 40 timesteps. Shat happens to the level of industrial HMC and where does it settle. Why is the curve of this form, and why does the level settle where it does?


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