Usually when you get this error, it is related to the geometry of the model (assuming the boundary conditions are done correctly).
There are two things you can check in the model:
1. Look for “edge-edge” or “point-face” contacts as they are considered invalid contacts under Flow Simulation.
2. Make sure the lids fully enclose the internal volume. The concept above applies here as well. If the lid is created with edge-edge contact to the main body, this is a problem. This is why the default “create lids” command in Flow Simulation will generate a lid body interfering with the opening.
If you are using FloXpress, you won’t see the error message if your geometry is not properly setup. Most likely FloXpress just won’t start.
The “check geometry” tool is actually very useful. I check it before I apply any boundary conditions (too bad FloXpress doesn’t have this capability).
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