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September 28, 2021, 12:55 |
no vortex shedding - flow over a cylinder
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#1 |
Member
Gabriel
Join Date: Aug 2021
Posts: 37
Rep Power: 5 |
Hi, im trying to simulate flow over a cylinder at Re =1.02e4 with simplefoam, komega sst, no vortex shedding appears, i used pimplefoam and its the same, no shedding, why this happens? i should be getting vortex shedding but nothing shows.
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September 28, 2021, 13:01 |
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#2 |
New Member
Marco Müller
Join Date: Feb 2013
Location: Germany
Posts: 23
Rep Power: 13 |
Hi, just looking at your picture I guess your mesh is way too coarse. Also the domain is too small.
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September 28, 2021, 15:34 |
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#3 |
Member
Gabriel
Join Date: Aug 2021
Posts: 37
Rep Power: 5 |
ok im going to fix that, thanks.
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September 28, 2021, 21:55 |
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#4 |
Member
Gabriel
Join Date: Aug 2021
Posts: 37
Rep Power: 5 |
i made a finer mesh and got better results, but if i make a more finer mesh simplefoam gives floating point exception, im using gmsh to make the mesh
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September 29, 2021, 09:53 |
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#5 |
Member
Join Date: May 2017
Posts: 31
Rep Power: 9 |
Check your timestep size / CFL number? CFL should normally be below 1 if you want to capture unsteady flows accurately.
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September 29, 2021, 13:58 |
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#6 |
Senior Member
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