June 10, 2021 at 8:29 pmJOELGEORGESubscriber
- Model: Standard K-omega.
- Reynolds No: 18.63e^-06
- Boundary Conditions:
Inlet - 22.22m/s Outlet - pressure outlet and gauge pressure set to 0 Pa. Bus body - wall, stationary non-slip condition. Rest of the zones are set as symmetry.
4.Solution methods: Scheme - Coupled and rest as default.
Can anyone help me this. Thanks in advance.June 11, 2021 at 6:45 amaitor.amatriainSubscriberOn the one hand, you get a varying Cd because the solution is not converged.
Could you please show us a picture of the residuals? I guess that there will be various peaks and the mean values will be far from the converged values.
On the other hand, you have a very poor mesh. Maximum orthogonal quality is 1 (the worst possible value) and the maximum aspect ratio is of the order of 10^(12). You should start working on this
June 11, 2021 at 7:29 amJOELGEORGESubscriberOk thank you, I will work on my meshing. My geometry is imported and it needs surface repair. I am new to geometry clean up. Can you suggest any tutorials that might help me.
June 11, 2021 at 8:33 amaitor.amatriainSubscriberWhat kind of problems do you have with your geometry? Could you post some pictures?
June 11, 2021 at 8:43 amRobAnsys EmployeeThere are some tutorials if you click on "Help" and navigate to SpaceClaim or Fluent Meshing. The former lets you fix the CAD, the latter allows you to ignore some of the errors. Given a bus is more-or-less a box on wheels you may also have a transient eddy shedding issue to deal with.
June 11, 2021 at 9:48 amJune 11, 2021 at 9:54 amaitor.amatriainSubscriberWhy are you meshing the interior of the bus? This is not necessary for your case.
In any case, I would recommend you to use Fluent Meshing. ANSYS Meshing is obsolete for CFD applications (with the exception of 2D meshing, as Fluent Meshing is not available in 2D).
June 11, 2021 at 9:56 amDrAmineAnsys EmployeeANSYS Meshing is still good for CFD Applications. You can use it or rely on Fluent Meshing Workflows to have a good mesh.
June 11, 2021 at 10:31 amJOELGEORGESubscriberFor meshing I did create a mesh with tet. elements (Patch conforming algorithm), body sizing for the body of influence, face sizing for all the faces of the bus, and finally created a prism layer around the bus boundary.
I would like to know how I could make orthogonal quality value in between 0.1 and 1.
June 11, 2021 at 11:02 amRobAnsys EmployeeHave a look at the regions with poor skew. What is the cause of the poor skew? Post images and we (the community) may be able to give you some pointers.
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