[Salome] Meshing strategy in SALOME

giorgianig · March 30, 2023, 10:31

Does anyone have any tip to generate large meshes (~50M elements) in SALOME?

I am trying to mesh a filtering grid with tetra elements and viscous layers, to be used in OpenFoam (pisoFoam). The mesh take ages to be computed and most of the time the quality is too low to be used. I have already splitted the geometry in 3 volumes, one containing the grid and the others for the inlet and outlet. I use NetGen for the mesh of the volume containing the grid, with viscous layers, and extrusion for the rest. The meshing of the grid volume is the one giving problems.

I am quite new to Salome, I am wondering if there is a procedure to obtain large quality meshes (for example, mesh the 2d wall first, then computing the 3d mesh maybe?, decreasing the size little by little?)

Thanks in advance.

ps. I wanted to put a picture of the grid but I am not sure how to do it....

klausb · September 14, 2023, 06:07

Did you try Gmsh within Salome?

Have a look at page 40 in this presentation https://gmsh.info/doc/course/general_overview.pdf . It seems to be very fast when it comes to generating large meshes.

I am also looking into Salome in the context of large meshes including boundary layers at the moment.

Alczem · September 14, 2023, 09:14

Hey!

Have you tried cfMesh? It is relatively fast and handle boundary layers and complex geometries quite well in my experience. If you have a single fluid region and no baffles, I would give it a try

March 30, 2023, 10:31	Meshing strategy in SALOME	#1
giorgianig Member Giorgio Join Date: Mar 2023 Posts: 46 Rep Power: 3	Does anyone have any tip to generate large meshes (~50M elements) in SALOME? I am trying to mesh a filtering grid with tetra elements and viscous layers, to be used in OpenFoam (pisoFoam). The mesh take ages to be computed and most of the time the quality is too low to be used. I have already splitted the geometry in 3 volumes, one containing the grid and the others for the inlet and outlet. I use NetGen for the mesh of the volume containing the grid, with viscous layers, and extrusion for the rest. The meshing of the grid volume is the one giving problems. I am quite new to Salome, I am wondering if there is a procedure to obtain large quality meshes (for example, mesh the 2d wall first, then computing the 3d mesh maybe?, decreasing the size little by little?) Thanks in advance. ps. I wanted to put a picture of the grid but I am not sure how to do it....

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September 14, 2023, 06:07		#2
klausb Senior Member Klaus Join Date: Mar 2009 Posts: 280 Rep Power: 22	Did you try Gmsh within Salome? Have a look at page 40 in this presentation https://gmsh.info/doc/course/general_overview.pdf . It seems to be very fast when it comes to generating large meshes. I am also looking into Salome in the context of large meshes including boundary layers at the moment.

September 14, 2023, 09:14		#3
Alczem Senior Member Join Date: Dec 2021 Posts: 221 Rep Power: 5	Hey! Have you tried cfMesh? It is relatively fast and handle boundary layers and complex geometries quite well in my experience. If you have a single fluid region and no baffles, I would give it a try