[Kosch]

Hi,

I have a problem.

Background:
I try to simulate a multispecies flow through a perforated pipe.
I can make the simulation with a tet-mesh and it does work but I want to reduce the cell number and therefore want to use the multizone method to generate an hex-mesh.

Problem:
The faces of the inlet holes (where the mutispecies flow leaves the pipe) make the geometry unsweepable. If I remove the holes (in spaceclaim or via virtual topology) the multizone method does work and creates a mesh with good quality and low cell number.

Of course I need the inlet for the simulation though . Is there a way to tell the mesher to "ignore" the faces and have them still available in the simulation? Or what would be a common practise for this kind of challenge?

Kind Regards

PS: I attached a picture of the troublesome part. The yellow slits are the mentioned holes, the blue face is the wall of the pipe. The simulation is symmetric in the XY plane and periodic in X direction (shouldnt matter for the meshing though).

[Kosch]

If anyone finds it on google on wonders about a solution:

There is no easy solution. One could split the element into smaller pieces which can be meshed with the Hex-Mesh. Disadvantage is that one ends up with a lot of elements.

In my case, I made a small scale simulation showing that the shape of the pipe is not relevant in the large scale of the simulation and simplified the pipe all together and avoided the issue at the end.