[Davide93]

Hi all,
i have just started working with Ansa for CFD applications and at the moment i'm having issues creating the mesh for a fluid domain which consists in the union of three cubic regions.

In the middle cube i have to obtain a volume mesh by "volume mesh--> extrude" command and in the outer two cubes a simple Tetra CFD mesh.
For Tetra cfd mesh i create two volume scenarios in Batch mesh and all it's ok.

The problems for me starts when i generate the middle mesh by extrude command; infact when i export mesh in Fluent the faces(pids) which are related to extruded volume disappear from the boundary conditions of Fluent menu.

Please, may you help me? Thank you very much and sorry for my bad English

[vangelis]

Hi Davide
Here are some tips

1) Ensure the three cubes are topologically connected.
The CONS should be yellow and only the CONS of the two inner
Faces should be cyan, indicating connectivity of 3 Faces.
2) Ensure you do not have duplicate Faces, Check Faces>RM.Double Same Side

3) Create a surface mesh of map quads in the inside cube

4) Mesh the inner volume with Volumes>Map. Do not use Extrude as the resulting mesh will not be connected topologically with both outer cubes.

5) Finally surface mesh the outer Faces, use Volumes>Define AutoDetect
and mesh them with TetraRapid (not TetraCFD which is an older slower algorithm)

Hope this helps.

Seek more help in
ANSA for CFD Brief User Guide.pdf from Help>ANSA documentation
or watch this getting started video
https://www.youtube.com/watch?v=4n-GbgyOG4o&t=9s

[Davide93]

Thank you very much for the tips.
Your reply helped me a lot.