SOLIDWORKS Flow Simulation Error: “Face is not laying on the boundary between the solid and fluid region.”

Article by Wayne Chen, CSWP updated September 12, 2011

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Usually when you receive the SOLIDWORKS Flow Simulation Error:

Face is not laying on the boundary between the solid and fluid region

It is related to the geometry of the model (assuming the boundary conditions are done correctly).

There are two things you can check in your model:

  1. Look for “edge-edge” or “point-face” contacts as they are considered invalid contacts under SOLIDWORKS 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 SOLIDWORKS Flow Simulation will generate a lid body interfering with the opening.

If you are using SOLIDWORKS 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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Wayne Chen, CSWP