Hello:

I have read some quotes on meshing schemes and corressponding problems and accuracy.

However, I have observed in my studies that for pure tetrahedral meshes, there exists a threshold beyond which the solution will be further away from the analytical value than the previous or coarser mesh.

1. Do you think that is possible?

2. do you think that this happens due to the fact that numerical error for tetrahedral cells increases exponentially leading to a condition that any further discretization will only take you away from the analytical solution? (in other words the numerical error due to the tetrahedral cells is much higher than the improvement in the solution due to further discretization in the form more tet cells)

Kindly reply and thank you for yout time and thoughts.

Best regards Sam

search for cell Peclet number, some authors call it local Reynolds number.