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Forum: CFX

November 23, 2016, 23:32

Replies: 9

Problem with Mesh Independent Convergence

Views: 2,616

Posted By ghorrocks

As a general rule, derivatives increase noise,...

As a general rule, derivatives increase noise, integrals decrease noise. Your function D uses the shear strain rate which is a derivative twice over (once in space, once in time). Fortunately you...

Forum: CFX

November 23, 2016, 17:37

Replies: 9

Problem with Mesh Independent Convergence

Views: 2,616

Posted By ghorrocks

kastarkas: I do not understand your second...

kastarkas: I do not understand your second question, but if you have not achieved mesh insensitive results by 7.3M nodes then you might have to go finer. Brian's point is important - you don't want...

Forum: CFX

November 16, 2016, 16:58

Replies: 9

Problem with Mesh Independent Convergence

Views: 2,616

Posted By ghorrocks

It is common for convergence to be harder to...

It is common for convergence to be harder to achieve as you refine the mesh. Finer meshes have less numerical dissipation, so the flow is less damped - and this allows little flow instabilities (such...

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