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Making program run faster

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Old   March 7, 2006, 09:12
Default Making program run faster
  #1
Konstantinos
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Are there any easy alterations that u can do on a model so that the iterations rus faster? Because its moving really slow... Im using star-cd 3.26
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Old   March 7, 2006, 10:09
Default Re: Making program run faster
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Mork
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Decrease the number of cells, use simpler or less models, buy more and faster computers....

What are you trying to do?
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Old   March 7, 2006, 12:52
Default Re: Making program run faster
  #3
Konstantinos
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Modelling the flow around a formula car... (Not a formula 1 obviously, its a formula student car). So i cant use a different model. Computers are quite fast because they r university computers! How do i decrease the number os cells?
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Old   March 7, 2006, 23:29
Default Re: Making program run faster
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Mac
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You need to re-mesh the car model again, to decrease the number of cells.
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Old   March 8, 2006, 06:09
Default Re: Making program run faster
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John Luo
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how many cells you are using. To simulate a 3D car body, it would be advisable to run in parallel mode using as many processors as you can grab. It is usually true if you use 2 processors, time reduced by half, and so on.
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Old   March 8, 2006, 06:35
Default Re: Making program run faster
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Konstantinos
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Thanks!
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Old   March 8, 2006, 06:39
Default Re: Making program run faster
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Konstantinos
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I dont know how many cells the problem is... Anyway I will try running it on two processors then, thanks!
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Old   March 8, 2006, 06:53
Default Re: Making program run faster
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matej
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Konstantinos, obviously if you want some reasonable results, you NEED and MUST read something about CFD (you'll find some references in the CFD-onine book section situated on the top of this page - right hand side). Additionally you MUST check the manuals. I know its a lot of reading, but STAR-CD is not MS Excel. Wait for your advisor and make him to get the training for you.

good luck matej

ps: RTFM stands for 'read the f*** manual' ) which is usually good advice in 99% of cases
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Old   March 8, 2006, 10:53
Default Re: Making program run faster
  #9
Zamir Rashid
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Are you using tets or hex for the case?

If you're using tet mesh (as I always do) I think it would help to use the command TETALIGN ALL which will reorder the vertex numbering and increase uniformity for tet meshes. This in turn would help to reduce memory requirements and computer time.

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Old   March 8, 2006, 12:58
Default Re: Making program run faster
  #10
Ben
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I have to agree with matej unfortunately it seems that you dont know a great deal about the subject, "how can I make my simulation run faster" is in the same bracket of questions of "how many cells do I need", "how big should my cells be", "I am studying X and my results are wrong, why" and so on and so forth.......!
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