Hex-dominant meshes and tetrahedral meshes yield different results?

[michaelscwu]

Hi,

I have a set of tetrahedral meshes and a set of hex-dominant meshes of the same model. Importing them into ANSYS mechanical APDL and performing a simple analysis on them, I found that tetrahedral solutions converge as mesh density increased. However, the hex-dominant meshes seem to jump all over the place as mesh density increased, and the solution is nowhere similar to the tetrahedral solutions. Does anyone have any idea what is wrong with the hex-dominant meshes?

I also ran the same analyses on the same model in Autodesk, and tetrahedral solutions and hex-dominant solutions converged nicely with the ANSYS tetrahedral solutions.

Thank you!

 

[Stanum]

Probably something is wrong elsewhere, with constraint or load application thus there can be problems. But you should be more specific with your problem and the model you are solving.