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How to improve mesh to get a more accurate result?

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Old   November 23, 2020, 02:58
Default How to improve mesh to get a more accurate result?
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Aarib Irfan
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Hello everyone!
I'm designing a 2D nozzle with exit flow of mach 5. By reducing the element size I get an output of 4.784. If I decrease the cell and face size then the mesh becomes finer but the solutions starts diverging. Can anyone tell me how can I get an accurate mesh? The image of the mesh attached gives 4.78 mach. If i try to increase its quality or size of face cells or elements then the solution diverges.
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Old   November 23, 2020, 07:07
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Manolis Theofilos
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You haven't attached an image so I can't comment on your mesh. However, assuming your y+ is within the proper range for the turbulence model you are using, I wouldn't worry about refining the mesh more manually. I would try to use mesh adaptation as this approach will add more cells where needed (big pressure gradients) and not in the whole domain.

Also bear in mind that your mesh might be ok as it is. Try using second order upwind for solution formulation, or even one of the third order methods, and also try playing with solution relaxation. Reduce the values for density and pressure, this might solve your convergence issue but will add computational time.
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