Low-Re Boundary Conditions for K-omega SST (aerodynamics)
Hi all,
Noob here, having a simple question. Let's take the Motorbike tutorial, that is included in OpenFOAM: Code:
/opt/openfoam7/tutorials/incompressible/simpleFoam/motorBike I have already seen this post, but it is quite old and I am not sure if it is still valid: https://www.cfd-online.com/Forums/op...m-1-5-dev.html I will include for your convenience the code of the k, nut, omega, p, U.orig files. k Code:
#include "include/initialConditions" Code:
boundaryField Code:
#include "include/initialConditions" Code:
#include "include/initialConditions" Code:
#include "include/initialConditions" |
I assume that the boundary layer is already refined so that y+<1. If not then try to refine the boundary layer using the command:
refineWallLayer 'patchNmae' 0.5 Then type omegaWallFunction; value $internalField; automatically switches to a low Re in case y+<1 and it resolve the boundary layer without using any wall function and switches to wall function when y+ is large. No need to modify anything |
Bassam, thanks for your answer.
Quote:
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For omega wall function I am sure! You can revise the theory behind this wall function which switch automatically.
However, the k and nut should be: kLowReWallFunction nutLowReWallFunction I just realised that they were not a LowRe Please revise page 27 from this report that support my claims: A Thorough Description Of How Wall Functions Are Implemented In OpenFOAM - Chalmers |
Thank you very much for your help and time, I will modify accordingly!
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So did it work with you? I tried the approach in another case and compared the results to experiment which was satisfactory
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Hi, right now I am trying to replicate in OpenFOAM a Simscale case that investigates the Ahmed body, using the boundary conditions that you suggested. I will get back to you as soon as possible and send you the outcomes when the solver will be done; it will take ~ 1 day because the mesh is pretty fine (18M cells and I am using a server with 8 cores only). Thank you again for your dedication ;)
https://www.simscale.com/projects/gs...ni/ahmed_body/ |
Wow 18M :eek: that definitely needs a cluster computer to handle the case. All the best in your simulations!
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