Learning Forum

[kipratam]

Hello, I am trying to do convergence test. I am simulating UAV wing using CFX. I created the mesh with ICEM CFD, structured mesh, and in my last variation of fluid domain grid, I tried to simulate it but the result was not as expected. Several times the simulation results showed convergence in the second iteration, but other mesh variation gave a good results, and several times the simulation showed results that do not show tendency to converge. When I simulated it in Fluent, it worked with the results in line with my expectations. Is there anything that I can do? Thank you.

Model information:

Minimum orthogonal quality: 0.2

Minimum quality: 0.24

Maximum mesh expansion factor: 39

[Amine Ben Hadj Ali]

Mesh quality alone is not a warranty for converging case if setup and numerical methods are off.
In ICEM CFD: Test what happens when either Settings>Meshing Options>Hexa Meshing>Project to bisplines is enabled or a tighter (e.g. 1e-5/1e-6) value for Settings>Model>Triangulation Tolerance has been set

In Ansys CFX run with laminar blending limit the SST model.

[Amine Ben Hadj Ali]

Also you are just plotting a couple of iterations: did you run the case further?

[kipratam]

Hello DrAmine, thank you for your reply. I managed to solve the problem recently, but I will try your suggestions. Thank you very much.

[Amine Ben Hadj Ali]

Welcome! It is good habit on the forum to summarize any solutions :)

[kipratam]

Hello DrAmine, I just want to inform you that your suggestions helped me to solve my problem, even though there are several simulation that is not converging smoothly, but it really helped and still got good results. Thank you very much.