Conformal Mesh with FreeCAD, Salome and later gmsh

CFD2DXY · May 17, 2023, 15:53

Hello everyone,

I have a little project and that will help us all here in our forum!
I want to create a multibody mesh with opensource programs like FreeCAD and Salome and later with GMSH.

I found this article: http://onelab.info/pipermail/gmsh/2015/010110.html

I used before Star CCM+ and it was no problem for making conformal multibody meshing but I don’t want to use it anymore. With CFMesh+ it’s also possible and I tried it, it works fine! But as I said I want to use opensource programs��!

I tried something:
I made a reactionzone (inner pipe) and a pipe which have a bigger diameter at the same point (on XY Plane). Like in this picture:
FreeCAD before boolean operations —>https://i.imgur.com/gNWLMJj.png

As I said I made many conformal mesh in my life and knows it’s better to make a differenz between the reactionzone+sweep and the reactionzone. So the result is only the sweep which is around the inner pipe (reactionzone). After I did a bollean operations —> FreeCAD after boolean oprations: https://i.imgur.com/VQwWLWD.png

Than I exported booth step files and import it into Salome.
Salome before partitioned:
https://i.imgur.com/J89FvOM.png
Than I did the partition but is it right with solid? Or maybe shell?
Salome partition:
https://i.imgur.com/ffSQDE6.png
After partition it’s looks like so —> Salome after partitioned:
https://i.imgur.com/abnXe41.png

This is my effort from today after using first time both softwares��. I am sure that we can fix the case.

My desired result: a multibody region where I can define two different physics and the boundary layer to the next region not will be merged. The most conformal mesh tutorial make two geometries one, but I want two separate from each other but where the nodes meet.

Thanks a lot �� and I hope we will solve this case.

Big regards

CFD2D

PS: after it works in Salome, I want to try it in GMSH (after partitioned in Salome). Than write a Pythonskript that make all automatically and all in this forum can use it.

Edit: here I found two very usefull videos:
https://youtu.be/U4qTv7UFFdA
https://youtu.be/pdlUbAUb1GY

But how I can put it on a cylinder and a hole-cylinder who including the first one like in my picture?

May 17, 2023, 15:53	Conformal Mesh with FreeCAD, Salome and later gmsh	#1
CFD2DXY New Member Madrigal Join Date: Oct 2020 Location: Germany Posts: 19 Rep Power: 5	Hello everyone, I have a little project and that will help us all here in our forum! I want to create a multibody mesh with opensource programs like FreeCAD and Salome and later with GMSH. I found this article: http://onelab.info/pipermail/gmsh/2015/010110.html I used before Star CCM+ and it was no problem for making conformal multibody meshing but I don’t want to use it anymore. With CFMesh+ it’s also possible and I tried it, it works fine! But as I said I want to use opensource programs��! I tried something: I made a reactionzone (inner pipe) and a pipe which have a bigger diameter at the same point (on XY Plane). Like in this picture: FreeCAD before boolean operations —>https://i.imgur.com/gNWLMJj.png As I said I made many conformal mesh in my life and knows it’s better to make a differenz between the reactionzone+sweep and the reactionzone. So the result is only the sweep which is around the inner pipe (reactionzone). After I did a bollean operations —> FreeCAD after boolean oprations: https://i.imgur.com/VQwWLWD.png Than I exported booth step files and import it into Salome. Salome before partitioned: https://i.imgur.com/J89FvOM.png Than I did the partition but is it right with solid? Or maybe shell? Salome partition: https://i.imgur.com/ffSQDE6.png After partition it’s looks like so —> Salome after partitioned: https://i.imgur.com/abnXe41.png This is my effort from today after using first time both softwares��. I am sure that we can fix the case. My desired result: a multibody region where I can define two different physics and the boundary layer to the next region not will be merged. The most conformal mesh tutorial make two geometries one, but I want two separate from each other but where the nodes meet. Thanks a lot �� and I hope we will solve this case. Big regards CFD2D PS: after it works in Salome, I want to try it in GMSH (after partitioned in Salome). Than write a Pythonskript that make all automatically and all in this forum can use it. Edit: here I found two very usefull videos: https://youtu.be/U4qTv7UFFdA https://youtu.be/pdlUbAUb1GY But how I can put it on a cylinder and a hole-cylinder who including the first one like in my picture? Last edited by CFD2DXY; May 18, 2023 at 07:26.