I am running into a problem while adapting a 2D U-channel flow into 3D. I am using this NS solver and the
buildlayers command to ‘extrude’ the previously used 2D geometry. When checking the results it seems as if there is virtually no flow between the inlet and outlet.
I have noticed that the mesh refinement (including the amount of layers set in the
buildlayers command) influence the result in an unexpected manner, with a higher refinement causing a seemingly more turbulent flow at the in- and outlet.
I have attached the correctly working 2D script and the faulty 3D script, as well as a reference image from the 2D result and two images of the 3D result with
buildlayers set to 10 and 30 layers, respectively, here (Sorry, I cannot attach anything here yet since I am a new user).
Any help is highly appreciated. Thank you!