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Forum: Main CFD Forum

October 27, 2009, 13:18

Replies: 5

Courant number in 2D and 3D

Views: 6,069

Posted By harishg

The criterions are usually derived by using Von...

The criterions are usually derived by using Von Neumann stability analysis. The use of the above criterion covers most of the methods. You can find detailed information on the stability criterion in...

Forum: Main CFD Forum

October 27, 2009, 12:39

Replies: 5

Courant number in 2D and 3D

Views: 6,069

Posted By harishg

For diffusion you can use \mu * dt / dx^2 =0.5.

For diffusion you can use \mu * dt / dx^2 =0.5.

Forum: Main CFD Forum

October 26, 2009, 18:39

Replies: 5

Courant number in 2D and 3D

Views: 6,069

Posted By harishg

You can use c0={sqrt[u^2+v^2+w^2]+c}dt/dx < 1...

You can use c0={sqrt[u^2+v^2+w^2]+c}dt/dx < 1 (assuming dx=dy=dz). If they are not equal you can try using dx=sqrt(dx1^2+dx2^2+dx3^2). For some schemes used for incompressible flows you might need c0...

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