Thank you for your reply. I have used watertight workflow to genetate polyhedral mesh with 5 boundary layers. The mesh size is 1mm in the wake region and recirculation zone. The computational domain is 10D long and the gas is fully expanded.
I have then re-generated poly-hex core mesh and the results were similar to the polyhedral mesh.
Could you please advise that is there a meshing problem or something else? Many thanks
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