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Instability with Riemann BC, possibly coupled with periodics? #2218
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I am trying to simulate a 2.5D airfoil set-up (though the example I show has a cylinder currently). I am trying to reduce the cell count by having the inlet and outlet relatively close to the airfoil (3 and 5 chords respectively). To prevent reflections I'm trying the Riemann BC. The rest of the patches of the box are periodic in such a way that the upper and lower, and front and back patches are communicated.
I get what seems to be a strange even-odd decoupling at the inlet (see screen grab attached). I thought it would be related to #1090, but changing the front and back periodics to symmetry does not fix it, so I assume it must be a problem with the Riemann.
I attach 2 cfg files (one with a steady state with symmetry planes, used to get the initial solution for the unsteadyc, but it also develops the same instability if I set them periodic ) and the gmsh geo file that generates the mesh.
su2bug.zip
System info:
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