I have calculated an y(distance wall to node)=5.1e-7m and therefore the height of my first cell to my understanding is yh=2*y=1e-6m. I attached two imagesof my mesh. I can't say if I have enough resolution to pick up the streamwise flow gradients. The angles of my cells are >27°, the aspect ratio is very very big due to the resolution near the boundary layer. I also can't say if the boundaries are far enough away from my area of interest.
I hope this information is informative in order to understand my problem.
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