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Forum: OpenFOAM Running, Solving & CFD

June 27, 2009, 09:22

Replies: 10

How can deltaT exceed the limitation of courant?

Views: 1,810

Posted By lakeat

There are 2 reasons for choosing a small time...

There are 2 reasons for choosing a small time step:
1. For stability;
2. For accuracy;

Do use a small time step, I mean small enough, to get a "good" result.
A good test is to compare deltat1...

Forum: OpenFOAM Running, Solving & CFD

June 27, 2009, 04:51

Replies: 10

How can deltaT exceed the limitation of courant?

Views: 1,810

Posted By lakeat

No, I think all CFD codes works under the same...

No, I think all CFD codes works under the same rule, CFL condition cannot be broken, or the results would be unphysical.

Keep Courant number below 1, or even 0.1.

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