thx for you're answer but I dont understand. So since the flow of the 360 degree is axisymmetric, I thought I will use something like a symmetry Plane at 180 degree and declare this symmetry plane as a mirror, so that the results are transferred to the other 180 degrees, so that I just have to simulate the half of my annulus. But yes, setting the hub and shroud as a mirror would have been wrong. But maybe also the keyword periodic boundary condition is in my case relevant.
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