[Netgen] Importing mesh for complex 2D cases

edvardsenpriv · December 5, 2005, 17:12

As I understand OpenFOAM solves cases in 3 dimensions by default, but can be instructed to solve in 2 dimensions by specifying the "empty" boundary condition on boundaries normal to the (3rd) dimension. When using Netgen the only elements that seem to be possible to convert is tet-elements, for which the "empty" boundary condition can not be used (I assume). I had an idea that it maybe was possible to import a surface-mesh, which then could be extruded, but haven't succeded so far. Anyone has good experience in running 2D cases on imported automesh (netgen / other meshers)? sometimes even a 2D geometry gets complex...

Lars

eugene · December 6, 2005, 04:07

If you have a 2D surface and want to make a 2D mesh, you want to use extrudeMesh followed by autoPatch. Of course, tetrahedral elements cannot form a 2D mesh.

edvardsenpriv · December 6, 2005, 05:23

Thanks,
but are you able to import any 2D surface to OpenFOAM (from which mesher?), or do you use blockmesh? I have mainly used Netgen (which can also mesh 2D surface mesh), but in the netgenNeutralToFoam converter, 2D surface seems not yet to be supported.

Lars

December 5, 2005, 17:12	Importing mesh for complex 2D cases	#1
edvardsenpriv New Member Lars Edvarsen Join Date: Mar 2009 Posts: 14 Rep Power: 17	As I understand OpenFOAM solves cases in 3 dimensions by default, but can be instructed to solve in 2 dimensions by specifying the "empty" boundary condition on boundaries normal to the (3rd) dimension. When using Netgen the only elements that seem to be possible to convert is tet-elements, for which the "empty" boundary condition can not be used (I assume). I had an idea that it maybe was possible to import a surface-mesh, which then could be extruded, but haven't succeded so far. Anyone has good experience in running 2D cases on imported automesh (netgen / other meshers)? sometimes even a 2D geometry gets complex... Lars

December 6, 2005, 04:07	If you have a 2D surface and w	#2
eugene Senior Member Eugene de Villiers Join Date: Mar 2009 Posts: 725 Rep Power: 21	If you have a 2D surface and want to make a 2D mesh, you want to use extrudeMesh followed by autoPatch. Of course, tetrahedral elements cannot form a 2D mesh.

December 6, 2005, 05:23	Thanks, but are you able to i	#3
edvardsenpriv New Member Lars Edvarsen Join Date: Mar 2009 Posts: 14 Rep Power: 17	Thanks, but are you able to import any 2D surface to OpenFOAM (from which mesher?), or do you use blockmesh? I have mainly used Netgen (which can also mesh 2D surface mesh), but in the netgenNeutralToFoam converter, 2D surface seems not yet to be supported. Lars

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