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Internal 2D steady simulation results depend on turbulence models strongly. |
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May 2, 2022, 04:31 |
Internal 2D steady simulation results depend on turbulence models strongly.
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#1 |
New Member
Březňák
Join Date: Jun 2020
Location: Prag
Posts: 21
Rep Power: 5 |
Hello,
Internal 2D steady simulation results depend on turbulence models strongly. You can see the geometry in the attachment. Let's think the flow direction is in plus. Flow is incompressible. y+ on the wall is between 1 and 2. The used solver is FLUENT and the residual targets are default values. 1. For case of RMS: >> the velocity x-component in plus is dominant near the wall in Zone 1. >> I can detect relatively huge detachment(Correct English word for Ablösung?) in Zone 2. 2. k-omega-SST: >> the velocity x-component in plus on the wall is smaller than the case of RMS in zone 1. >> Detachment in Zone 2 also smaller than in the case of RMS. 3. k-epsilon: >> the velocity x-component in plus on the wall can be found only in the half length of zone 1. >> Detachment in Zone 2 is barely to detected. For each three models, I also tested different meshes (coarse, moderate, dense), but the results seem like that turbulence models have more effect on the different flow results. In the case of k-omega-SST with more dense mesh, the results show bigger detachment in zone 2 than results with k-omega-SST and coarser mesh. Which turbulence model will be best in this problem? With kind regards Breznak Last edited by breznak; May 2, 2022 at 07:21. Reason: geometry |
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May 2, 2022, 12:36 |
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#2 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
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Could you show the comparison of the results (for example the 1d velocity profiles) for all cases only for the finest mesh (number of final nodes in x and y?)?
If you are working without wall-modelled BCs you should use some more nodes at y+<1. |
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May 4, 2022, 17:24 |
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#3 | |
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Join Date: Jun 2011
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Quote:
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May 9, 2022, 07:42 |
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#4 |
New Member
Březňák
Join Date: Jun 2020
Location: Prag
Posts: 21
Rep Power: 5 |
Thank you so much for your answer, but unfortunately I cannot upload detailed geometry in public.
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