Converting Salome hybrid mesh to OpenFOAM

Arnoldinho · December 7, 2010, 07:34

Hi all,

I have to convert a combined tetrahedron/hexahedron mesh created in Salome into the OpenFOAM mesh format. For not-mixed meshes, the UNV format can be used as export in Salome and ideasUnvToFoam to convert it for OpenFOAM. For mixed meshes this does not work, as Salome does not save pyramids in their UNV files. Message "During export mesh to UNV pyramid's elements will be missed".

I read about a workaround using the MED format and gmesh with med support, but this is not straight forward at all.

Is there any converter for MED to OpenFOAM mesh? If not, what could be the starting point for me to create such a converter?

Until now I used blockMesh, SHM and snapEdge, but it's not working very well for the quite complex geometries I'm using at the moment. Also, boundary layer generation either using SHM or refineWallLayer is not working as it should...

Best regards,
Arne

thanz · March 27, 2012, 06:50

Has anyone knows a way to convert those mixed-meshes from salome to openfoam?

elvis · March 27, 2012, 07:16

Hi,

do you know pythonflu? => SALOME OpenFOAM coupling
In http://www.openfoamworkshop.org/6th_...ord_slides.pdf
on slide 18 & 19 he mentions => direct in-memory Salome to OF (vice versa) mesh writing using pythonFlu and that this way supports arbitary polyhedral meshes (and that ideasUnvToFoam does not support these).

just an idea and my 2 cents

thanz · March 27, 2012, 12:05

Hi Elvis,

Have you used to it to export mesh in readable format for openfoam? and what format was it?

Thanks

elvis · March 28, 2012, 10:24

Hi Thanasis,

I have not used it myself (now), but if you take a look at example
you see that they used the Mesh and the BC directly
=> p = volScalarField => solve( UEqn == -fvc.grad( p ) )
=>...mesh, IOobject.NO_READ, IOobject.AUTO_WRITE
=>phi = ( fvc.interpolate( U ) & mesh.Sf() ) + fvc.ddtPhiCorr( rUA, U, phi )

I guess you would like a "not so sophisticated example" that just writes OpenFoam- Files in the corresponding folders and you use/call icoFoam or so to do the calculation! It can be done that way.

December 7, 2010, 07:34	Converting Salome hybrid mesh to OpenFOAM	#1
Arnoldinho Senior Member Arne Stahlmann Join Date: Nov 2009 Location: Hanover, Germany Posts: 209 Rep Power: 17	Hi all, I have to convert a combined tetrahedron/hexahedron mesh created in Salome into the OpenFOAM mesh format. For not-mixed meshes, the UNV format can be used as export in Salome and ideasUnvToFoam to convert it for OpenFOAM. For mixed meshes this does not work, as Salome does not save pyramids in their UNV files. Message "During export mesh to UNV pyramid's elements will be missed". I read about a workaround using the MED format and gmesh with med support, but this is not straight forward at all. Is there any converter for MED to OpenFOAM mesh? If not, what could be the starting point for me to create such a converter? Until now I used blockMesh, SHM and snapEdge, but it's not working very well for the quite complex geometries I'm using at the moment. Also, boundary layer generation either using SHM or refineWallLayer is not working as it should... Best regards, Arne

March 27, 2012, 07:16		#3
elvis Senior Member Elvis Join Date: Mar 2009 Location: Sindelfingen, Germany Posts: 620 Blog Entries: 6 Rep Power: 24	Hi, do you know pythonflu? => SALOME OpenFOAM coupling In http://www.openfoamworkshop.org/6th_...ord_slides.pdf on slide 18 & 19 he mentions => direct in-memory Salome to OF (vice versa) mesh writing using pythonFlu and that this way supports arbitary polyhedral meshes (and that ideasUnvToFoam does not support these). just an idea and my 2 cents lourencosm and aadicfd like this.

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March 27, 2012, 06:50		#2
thanz New Member Thanasis Join Date: Mar 2010 Location: Greece Posts: 9 Rep Power: 16	Has anyone knows a way to convert those mixed-meshes from salome to openfoam?

March 27, 2012, 12:05		#4
thanz New Member Thanasis Join Date: Mar 2010 Location: Greece Posts: 9 Rep Power: 16	Hi Elvis, Have you used to it to export mesh in readable format for openfoam? and what format was it? Thanks

March 28, 2012, 10:24		#5
elvis Senior Member Elvis Join Date: Mar 2009 Location: Sindelfingen, Germany Posts: 620 Blog Entries: 6 Rep Power: 24	Hi Thanasis, I have not used it myself (now), but if you take a look at example you see that they used the Mesh and the BC directly => p = volScalarField => solve( UEqn == -fvc.grad( p ) ) =>...mesh, IOobject.NO_READ, IOobject.AUTO_WRITE =>phi = ( fvc.interpolate( U ) & mesh.Sf() ) + fvc.ddtPhiCorr( rUA, U, phi ) I guess you would like a "not so sophisticated example" that just writes OpenFoam- Files in the corresponding folders and you use/call icoFoam or so to do the calculation! It can be done that way.