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Forum: Main CFD Forum

November 30, 2013, 12:27

Replies: 8

Minimum Time Step with Navier Stokes

Views: 1,867

Posted By Atreides

I will investigate. Thanks very much for the...

I will investigate. Thanks very much for the help.

Forum: Main CFD Forum

November 30, 2013, 11:52

Replies: 8

Minimum Time Step with Navier Stokes

Views: 1,867

Posted By Atreides

Well perhaps I have other errors in my code but...

Well perhaps I have other errors in my code but this produces a far larger time step than I have been using and it is immediately unstable. From where did you derive this equation for stability?
...

Forum: Main CFD Forum

November 30, 2013, 10:40

Replies: 8

Minimum Time Step with Navier Stokes

Views: 1,867

Posted By Atreides

I am using an Explicit Time Advance scheme. ...

I am using an Explicit Time Advance scheme.

I calculate the combination of the advective and viscous terms and its divergence from the initial velocity field.

I solve Poisson's equation for...

Forum: Main CFD Forum

November 30, 2013, 10:18

Replies: 8

Minimum Time Step with Navier Stokes

Views: 1,867

Posted By Atreides

Yes, yes, my mistake. I am using CDS for all...

Yes, yes, my mistake. I am using CDS for all discretizations as per my instructions. My Reynolds number is only 100 (mu is 0.01, rho is 1, velocity is 1).

I'm not sure exactly what you mean by...

Forum: Main CFD Forum

November 29, 2013, 23:48

Replies: 8

Minimum Time Step with Navier Stokes

Views: 1,867

Posted By Atreides

Minimum Time Step with Navier Stokes

Hello,

I am a bit of a newbie at CFD. I am trying to determine what the minimum time step would be when solving the N-S equations for a lid-driven cavity flow (2D) in order to achieve stability. ...

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