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AnswerCross post. Pin
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QuestionA Modelling Question Pin
Roger Wright21-Aug-12 13:01
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GeneralRe: A Modelling Question Pin
Peter_in_278021-Aug-12 16:08
memberPeter_in_278021-Aug-12 16:08 
The good thing about simulation is that if it blows up, no physical damage is done! (Just as well, given some of the simulations I've run in the past!)
At each event, you need to update the state of the world (pump 1 is running, so the level in tank 23 is going down at 1000gpm, the pressure in the pipe at point X is ... ) then predict what "nonlinear" events are going to happen and when (tank 23 will reach lower limit switch level in 18 minutes, tank 28 will start filling at 1000gpm in 7 minutes ...) then plug them in as future events. All the continuous stuff (like solving DEs Poke tongue | ;-P ) is hidden in the 'prediction' phase of event handling.

I must admit, the first few serious simulations I wrote, the system behaviour stuff was hard-coded. The event handling skeleton and utility functions were reused, and slowly morphed into a more general purpose beast that could actually be described as a 'package'. Sadly, it's all faded into history. Last seen in the bucket "things I might port from Fortran77 to C".

The size of your system is NOT an issue for getting a simulation running. If you can model one station, then adding five more (even with different parameters) is trivial.

If you want to continue this conversation offline, feel free.

Cheers,
Peter
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012

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Generalalgorithmic approach to calculating number of full moon since a certain date ? Pin
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