[thezack]

Hi, I am having an error in my simulations that I cannot seem to fix. I have a turbine (DFBI 1 axis rotation) rotating inside of another larger mesh. The purpose of the simulation is to simulate a gravitational vortex turbine (water enters from the top of a funnel and swirls down the funnel creating a vortex, and a turbine is placed at the bottom to rotate a shaft). The simulation is 3D. Mesh 1 is the polyhedral mesh of the funnel volume, and mesh 2 is the overset mesh of the turbine completely enclosed within mesh 1. Both are polyhedral mesh, mesh 2 has prism layer mesher, surface remesher, and surface wrapping meshing models. Mesh 1 has polyhedral, prism layer, and surface remesher.

I keep trying varying levels of mesh size for mesh 1 and mesh 2, and I keep getting this error message:


Updating indirect region interface Overset Mesh 1 between Turbine and SwirlyMarch5NoDamEntrance.
Failed to cut hole in region SwirlyMarch5NoDamEntrance.
This might be due to an overlapping of overset regions or due to invalid mesh configuration!

Am I using the wrong meshing models? Should mesh 1 or mesh 2 be finer? Should they be roughly the same mesh size or should 2 be much finer? I am new to this, and I have no idea how to proceed. I keep messing around with the mesh properties and nothing seems to work. I am not sure if there is something specific I should be changing. The documentation on Star CCM+ has a troubleshooting section, but it does not say how to fix those kinds of errors. Ive tried setting up the scalar overset mesh type scene, but of course it is in 2-D when my simulation is 3-D, so I cannot see where on the mesh the error is. I am pretty stumped here and would greatly appreciate any help. Thanks!