As an Ansys employee, we can't download any files attached to this post. However, I'll try to put my thoughts here:
1. Make sure the direction of the assigned gravity is correct. 2. Is this a steady case? I suggest extending the simulation further (currently at 94 iterations). It's normal to see a reversed flow at the beginning, but it should gradually improve with more iterations if everything is set up correctly. 3. I'm curious about the purpose of simulating two phases. Can you share more details on how did you set up the multiphase flow?
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