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Forum: CFX

August 6, 2014, 08:30

Replies: 8

Multi-domain divide by zero

Views: 1,621

Posted By ghorrocks

Yes - if the mesh motion is rotation or...

Yes - if the mesh motion is rotation or translation then the volume should not change. But it will change a tiny bit due to numerical noise, and the solver marches to convergence with the potential...

Forum: CFX

August 5, 2014, 18:51

Replies: 8

Multi-domain divide by zero

Views: 1,621

Posted By ghorrocks

1) You can use expert parameters to turn the...

1) You can use expert parameters to turn the solvers off, then the simulation will run quickly as the mesh motion is the only thing happening. This FAQ has some tips on doing this:...

Forum: CFX

August 5, 2014, 00:37

Replies: 8

Multi-domain divide by zero

Views: 1,621

Posted By ghorrocks

1: Yes, mesh diffusion can and does create inside...

1: Yes, mesh diffusion can and does create inside out elements. When you get these it is reported as negative volume elements. But before you get to this stage you have very poor quality elements...

Forum: CFX

August 4, 2014, 18:14

Replies: 8

Multi-domain divide by zero

Views: 1,621

Posted By ghorrocks

Have you done a run where you save an output file...

Have you done a run where you save an output file on every time step (including the mesh) and checked that the mesh is not doing some weird movement?

Can you post a picture of what you are...

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