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Solution diverges at high Reynolds numbers and fine grid in COMSOL

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Old   September 1, 2019, 18:00
Default Solution diverges at high Reynolds numbers and fine grid in COMSOL
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Hi, I'm using COMSOL to simulate heat transfer of a flow over a series of cylinders.
When I use Reynolds numbers bigger than 100, the solution only converges with normal mesh and it diverges with finer meshes!

It diverges with following grid at Re=200 and converges with Re=100!

And It will be converged with this grid:

And it makes me unable to check mesh dependency.

Is there any reason?
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