[balrog_f]

I am learning ICEM at the moment and really don't this tolerance. What is the difference between triangulation tolerance and topo tolerance? Can someone please explain the topo tolerance in simple words? I really don't get it. I figured out that when i am changing the triangulation tolerance my mesh is following curves "better".
Furthermore, is a triangulation tolerance of 1e-06 bad or needs more computational effort during calculation? How does it affect simulation time or even solution?

[bluebase]

Hi balrog,


triangulation tolerance seems to be relevant for the geometry only. With decreasing triangulation tolerance, the approximation of a curve/surface, such as for a circle, improves.
In ICEM this might lead to higher load on memory on graphics. But there is no direct impact on downstream processes.



The topology tolerance is a property of the mesher; a tolerance which determines how far a line/face of an element is allowed to deviate from the (approximated) geometry.



Triangulation tolerance usually improves "the fit" of a mesh because the mesher needs a discrete geometry (that's what i assume). Even though, a circle can be defined analytically, the mesh probably still need discrete entities.


Best regards,
Sebastian

[balrog_f]

Thank you very much!