# Cell determinant (wellposedness)

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 September 27, 2010, 13:04 Cell determinant (wellposedness) #1 New Member   Oscar Join Date: Jun 2009 Location: Murcia, Spain Posts: 14 Rep Power: 8 I'm pretty sure there isn't a single thread in the forum dealing with this thema and I hope that somebody can shed some light on this. checkMesh says my mesh is OK, but if I run "checkMesh -allGeometry -allTopology" I get a huge number of cells with small determinant that are written to a faceSet undeterminedCells. I guess I need to change my numerical schemes, but in order to do that I need to understand how this small determinant values affect my simulations. Can anybody please comment on that? Thanks! PS.- I know I could re-build the mesh and get rid of the low determinants, but this is not the point. I would like to understand their effect on the numerics.

 April 5, 2011, 04:23 #2 Senior Member   Andrea Ferrari Join Date: Dec 2010 Posts: 275 Rep Power: 7 I have the same problem. Did you find any solution? andrea

 August 30, 2011, 08:40 #3 Member   Join Date: Nov 2009 Location: Germany Posts: 96 Rep Power: 7 I'm also interested in this. Has anyone some experience with this issue? Does this even effect the simulation? __________________ "When I meet God, I am going to ask him two questions: Why relativity? And why turbulence? I really believe he will have an answer for the first." Werner Heisenberg

 April 17, 2012, 12:26 #4 Member   ms Join Date: Mar 2009 Location: West London Posts: 44 Rep Power: 8 I'm interested too and can't find anywhere on this site that helps! and then...... I realised the cells in question were extruded triangles; the extrusion resulted in all nodes of the wedges being in contact with a boundary condition: symmetry on one side, no slip on the other two: all nodes in each wedge are on a defined boundary. Perhaps that's the issue. They don't seem to be affecting solution too much. holodeck10 likes this.

 Tags determinant, mesh, pressure, quality, scheme

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