CFD Online Discussion Forums

CFD Online Discussion Forums (
-   CD-adapco (
-   -   Making program run faster (

Konstantinos March 7, 2006 09:12

Making program run faster
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

Mork March 7, 2006 10:09

Re: Making program run faster
Decrease the number of cells, use simpler or less models, buy more and faster computers....

What are you trying to do?

Konstantinos March 7, 2006 12:52

Re: Making program run faster
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?

Mac March 7, 2006 23:29

Re: Making program run faster
You need to re-mesh the car model again, to decrease the number of cells.

John Luo March 8, 2006 06:09

Re: Making program run faster
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.

Konstantinos March 8, 2006 06:35

Re: Making program run faster

Konstantinos March 8, 2006 06:39

Re: Making program run faster
I dont know how many cells the problem is... Anyway I will try running it on two processors then, thanks!

matej March 8, 2006 06:53

Re: Making program run faster
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' :o) which is usually good advice in 99% of cases

Zamir Rashid March 8, 2006 10:53

Re: Making program run faster
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.

Ben March 8, 2006 12:58

Re: Making program run faster
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.......!

All times are GMT -4. The time now is 20:41.