Meshing for multiphase flow
I am trying to mesh a rectangular channel using Ansys workbench that will be used for multiphase flow using VOF method with oil and water. However, the mesh I create constantly results in high courant number in Fluent. I am using variable steeping in Fluent with the courant number set to 1 and minimum time step of 1e -07 and maximum time step of 1e -04. The courant number greatly exceeds 1 and the results become unrealistic. I created an automatic mesh by Ansys workbench which gives satisfactory results but I couldn't make the mesh finer near the wall. So to fix that I am manually meshing the channel in Ansys workbench by defining the number of edge divisions but it just isn't working. I have tried coarsening and refining the mesh but it doesn't work either. I have attached my mesh picture, can someone please help me??? My boundary condtions are velocity inlet, pressure outlet, and a contact angle at the wall. The flow is incompressible and laminar. Thank you very much for the help. If you need any more info then please let me know.
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