Gmsh - 2D mesh Extrusion Boundary Conditions

heitorvitorc · May 7, 2019, 09:22

Dear Community,

Good afternoon,

Is there a way to convert a "physical line" boundary condition into a "physical surface" one? I have a very complex geometry of a real porous media, and I am capable of generate a 2D mesh for Ansys and/or FENIcS, but I must compare the values with finite volume method, which will require OpenFOAM simulation.

I can extrude the mesh easily, but I cannot automatically create all the physical surfaces and the physical volume for the single-layered extruded mesh.

Best regards,

Vitor Cardoso

Flowkersma · May 14, 2019, 08:36

Hi Vitor,

You could import the same mesh to OpenFOAM that you used in Ansys/FEniCS simulations. OpenFOAM supports several mesh formats such as Ansys/Fluent (.ans/.msh). Otherwise, extrude your GMSH surface mesh one cell in the third direction. The extrusion function returns an array with the surface indices which you can use to define the physical surfaces.

Best, Mikko

May 7, 2019, 09:22	Gmsh - 2D mesh Extrusion Boundary Conditions	#1
heitorvitorc New Member Vitor Heitor Cardoso Join Date: Jan 2019 Location: Rio de Janeiro Posts: 10 Rep Power: 7	Dear Community, Good afternoon, Is there a way to convert a "physical line" boundary condition into a "physical surface" one? I have a very complex geometry of a real porous media, and I am capable of generate a 2D mesh for Ansys and/or FENIcS, but I must compare the values with finite volume method, which will require OpenFOAM simulation. I can extrude the mesh easily, but I cannot automatically create all the physical surfaces and the physical volume for the single-layered extruded mesh. Best regards, Vitor Cardoso

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May 14, 2019, 08:36		#2
Flowkersma Senior Member Mikko Join Date: Jul 2014 Location: The Hague, The Netherlands Posts: 243 Rep Power: 12	Hi Vitor, You could import the same mesh to OpenFOAM that you used in Ansys/FEniCS simulations. OpenFOAM supports several mesh formats such as Ansys/Fluent (.ans/.msh). Otherwise, extrude your GMSH surface mesh one cell in the third direction. The extrusion function returns an array with the surface indices which you can use to define the physical surfaces. Best, Mikko