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Increasing mesh resolution yields big difference in pressure? |
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September 24, 2014, 07:58 |
Increasing mesh resolution yields big difference in pressure?
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#1 |
New Member
Join Date: Sep 2014
Posts: 12
Rep Power: 12 |
Hey everyone
I am quite new to CFD and to OpenFOAM so please bear with me if this is a stupid question. I have been looking at the cavity tutorial and when I increase the mesh resolution there is a pressure increases in the top left of the cavity and decreases at the top right. The increase and decrease of the pressure will continue as the mesh resolution gets better. I can basically obtain any pressure by changing the mesh resolution. I use the pressure legend in Paraview to determine the upper and lower pressure values. How can this be right? Shouldn't OpenFOAM/Paraview try to depict the actual pressures regardless what the resolution is? |
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September 26, 2014, 08:53 |
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#2 |
Senior Member
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Hi Wizze,
This is due to the fact that there is a singularity right at those corners. On one side there is a moving lid on the other side a stagnant wall. No-slip conditions on those sides make that there is no actual solution for the pressure in the corner. When refining the mesh this will cause the behavior you see. So it is actually the correct behavior. Regards, Tom |
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September 26, 2014, 09:15 |
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#3 |
New Member
Join Date: Sep 2014
Posts: 12
Rep Power: 12 |
Thank you very much Tom :-)
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