Z direction thickness control when using fluentMeshToFoam to extrude 2D mesh

wei_wu · January 31, 2009, 14:52

Hi, all

I'm using the fluentMeshToFoam to extrude the 2D fluent mesh into 3D foam mesh. The aspect ratio is way too high for the boundary layer cells. I think the high aspect ratio comes from the Z dimension because when I check the 2D mesh in the gambit they are fine, but when I used the checkMesh after it's converted into 3D it reported the high ratio problem. I'm using 0.0001m for the thickness of first the boundary layer cell , but the thickness in the Z direction is 1.442m, which is automatically generated after fluentMeshToFoam. My question is how can I control the Z direction dimension when I'm converting the 2D mesh to a 3D?

Thank you

maruthamuthu_venkatraman · February 1, 2009, 04:43

Hello,
The quick alternative can be you shall extrude the mesh in GAMBIT for a small z distance and export it to OPENFOAM. Since OpenFoam works with 3d geometry, may be the default size is set as some specific number.. If you have time for it you shall fix it...

may be it helps you...

juho · February 1, 2009, 05:15

I think you could use transformPoints to change the Z-thickness after the extrusion. For example scale (1 1 0.1) would result in Z-thickness of 0.1442m on your mesh.

January 31, 2009, 14:52	Hi, all I'm using the fluen	#1
wei_wu New Member wei wu Join Date: Mar 2009 Location: us Posts: 14 Rep Power: 17	Hi, all I'm using the fluentMeshToFoam to extrude the 2D fluent mesh into 3D foam mesh. The aspect ratio is way too high for the boundary layer cells. I think the high aspect ratio comes from the Z dimension because when I check the 2D mesh in the gambit they are fine, but when I used the checkMesh after it's converted into 3D it reported the high ratio problem. I'm using 0.0001m for the thickness of first the boundary layer cell , but the thickness in the Z direction is 1.442m, which is automatically generated after fluentMeshToFoam. My question is how can I control the Z direction dimension when I'm converting the 2D mesh to a 3D? Thank you

February 1, 2009, 04:43	Hello, The quick alternative	#2
maruthamuthu_venkatraman Member Maruthamuthu Venkatraman Join Date: Mar 2009 Location: Norway Posts: 80 Rep Power: 17	Hello, The quick alternative can be you shall extrude the mesh in GAMBIT for a small z distance and export it to OPENFOAM. Since OpenFoam works with 3d geometry, may be the default size is set as some specific number.. If you have time for it you shall fix it... may be it helps you...

February 1, 2009, 05:15	I think you could use transfor	#3
juho Member Juho Peltola Join Date: Mar 2009 Location: Finland Posts: 89 Rep Power: 17	I think you could use transformPoints to change the Z-thickness after the extrusion. For example scale (1 1 0.1) would result in Z-thickness of 0.1442m on your mesh. Saideep and zp_chem like this.

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