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Time Steps gets smaller and smaller

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Old   July 17, 2009, 13:28
Default Time Steps gets smaller and smaller
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Antonio Martins
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Hi Foamers,

I am trying to model the flow of a complex fluid where extra tension terms can be significant. I am trying to do the simulations imposing a limit maximun value for the courant number, in this case 0.001, and from there estimate the time step. I am using PISO.

The simulations starts O.K, but then the time steps go down very fast. Is there any way of controlling the mininum time step. The maximum step can be controlled in the controlDict Dictionary, but not the minimum time step.

How I can do it?


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Old   July 22, 2009, 08:19
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just have look User Guide page number U-62 (dam break) example,
here u can get answer for u r question.

may be i am wrong also!

good luck,
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