[certyfikat]

Hello.

I have following problem.
I would like to make a flow simulation on a muti-body 3D model.
The data is imported form CATIA. It is a CATPart with 3 bodies, one of the body has few domains.



after import into CFX it looks like this:



now, how the mesh should be performed? I know that it should be conformal, the contact faces have been generated automatically.



Solver crashes on such mesh.

I would like to have these body separated, because my intent is to measure velocity in each pipe and mass flow rate.

I would be very grateful for help.

Regards,
M.

[ghorrocks]

If the meshes do not match up then you need to connect them with GGI interfaces.

But this geometry is simple and there should be no need for interfaces. You should easily be able to make this design a single body and mesh it as a single body. Having GGI interfaces at critical parts of the flow is to be avoided if possible.

To get the flow rate in each pipe you can either put a interface in the middle of the pipe (away from the critical entry/exit regions), or get it in post processing (then you can measure the flow rate across any cross section with no need to specify a mesh boundary).

And this mesh is very coarse and there is no way you are going to get an accurate simulation from it. It will need to be much finer. But I suspect that is just a simple mesh to get it working before you use a proper mesh to get accurate answers.

[singer1812]

Pipe this geometry through Design Modeler first and in Design Modeler combine all the geometery into a single part (FORM NEW PART in Design Modeler with all the parts highlighted). When you do this, Ansys will make the mesh conformal.