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Unphysical peaks in the pressure field at sharp corners – why?

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Old   March 5, 2016, 06:35
Default Unphysical peaks in the pressure field at sharp corners – why?
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Josef Camilleri
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Hello,

I am simulating the water impact of plate inclined at an angle of 10 degrees, in Star CCM+, see geometry and mesh in figure 1. Around the sharp edges of the plate, in a few prism layer cells, I am getting very high negative pressures, which are unphysical, see Figure 2.

At first I thought that this is occurring because at the corner I have two cells attached to two different boundaries (no-slip wall condition) and the common face gets information from these two cell centres, so it tried the mesh in Figure 3 (which is very bad mesh but I wanted to test this) however the problem still happens.

I also tried refining the mesh around the corners to limit the aspect ratio of the cells but it did not help.

I have read that sharp corners are points of singularity in CFD. But why? Is it the boundary conditions? Or because Star CCM+ uses the cell-centred Finite Volume method? I am more looking for a 'technical' answer to why this happens with the methods used in Star CCM+ in mind.

Thank you for your time.

Regards,
Josef
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File Type: png Figure 2.png (41.3 KB, 22 views)
File Type: png Figure 3.png (33.2 KB, 15 views)
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