About mesh used in thermal analysis 1

[xuxxx679]

Hi,

I've been told that hex meshing is always better than tet in mechanical simulations (stress, contact, etc). I'm wondering if the same thing is true in thermal analysis? Also, is it required to use hex20 instead of hex8 for transient thermal analysis since for transient the heat equation is second order? I'd really appreciate it if someone can share his/her thoughts with me on this.

Thanks,
Danny

 

[corus]

In general it's better to use quadrilateral elements but you can use linear tet elements for thermal analyses if you refine the mesh enough. In all cases refine the mesh towards surfaces where the transient will be most severe.

 

[cjvs]

It is very useful to run the models, or similar sample models, both ways to learn how much difference it makes.
Cheers