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Converge in Dense meshe, Diverge in less mesh, but correct answer in less mesh!?!?

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Old   December 23, 2009, 14:22
Default Converge in Dense meshe, Diverge in less mesh, but correct answer in less mesh!?!?
Join Date: Dec 2009
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Hi again,

I am working flow over cylinder 2D with fluent and my purpose is that show the vortex shedding behind the cylinder.

I meshed the domain 2 times. First I meshed dense and my solution converged but i couldnt see the vortex shedding. I should mention the my fluid is air and the velocity is 0.002 so that my Re=137.

The solver is Laminar, steady and etc.

next time, I changed my meshing and change to less mesh than before after that my solution didnt converge but i saw the vortex shedding behind the cylinder.

I attached the figures of my solution in both cases and my meshes in both cases.

does anyone know the reason of that?

Thanks in advance.
Attached Images
File Type: jpg question.jpg (98.0 KB, 9 views)
File Type: jpg dense.jpg (99.7 KB, 7 views)
File Type: jpg less.jpg (101.0 KB, 6 views)
File Type: jpg Re137_particle.jpg (99.1 KB, 7 views)
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