Multi-block geometry from blender

sebastian610 · May 10, 2013, 16:51

Blender seems to be a good tool for creating geometry for CFD before meshing.

Is it possible with Blender to create a geometry that consists of two blocks which share a common face? Either by splitting a volume or by extruding a face of a volume or by glueing two volumes together.

I hope this post is adequately placed in this forum. CFD people probably best understand why I would want such a geometry.

Thanks for your hints.

ogloth · May 14, 2013, 03:25

Hi,

yes, this should be very easy. We use this approach to define geometries with multiple volumes (e.g. conjugate heat transfer) which are then meshed with enGrid.

To create such a geometry in Blender is straightforward and I am sure there is more than one viable method. If you know (learn) your way around Blender then it should be clear what needs to be done.

A different question is how you can use the geometry for meshing.

Cheers,
Oliver

sebastian610 · May 14, 2013, 13:50

Hello Oliver,

Thanks for your answer. I am used to more CFD-oriented CAD preprocessors like Gambit or ICEM where it is very simple to just split a block, insert vertices, faces etc.. It will take me some time to figure out how to do it in blender.

I appreciate that it is not strictly necessary to have a real multi-block domain since with OpenFOAM one can stitch together sub-meshes. I do, however, like the idea of having a "nice" mesh at internal faces.

-Sebastian

May 10, 2013, 16:51	Multi-block geometry from blender	#1
sebastian610 New Member Sebastian Join Date: May 2013 Posts: 7 Rep Power: 12	Blender seems to be a good tool for creating geometry for CFD before meshing. Is it possible with Blender to create a geometry that consists of two blocks which share a common face? Either by splitting a volume or by extruding a face of a volume or by glueing two volumes together. I hope this post is adequately placed in this forum. CFD people probably best understand why I would want such a geometry. Thanks for your hints.

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May 14, 2013, 03:25		#2
ogloth Senior Member Oliver Gloth Join Date: Mar 2009 Location: Todtnau, Germany Posts: 121 Rep Power: 17	Hi, yes, this should be very easy. We use this approach to define geometries with multiple volumes (e.g. conjugate heat transfer) which are then meshed with enGrid. To create such a geometry in Blender is straightforward and I am sure there is more than one viable method. If you know (learn) your way around Blender then it should be clear what needs to be done. A different question is how you can use the geometry for meshing. Cheers, Oliver

May 14, 2013, 13:50		#3
sebastian610 New Member Sebastian Join Date: May 2013 Posts: 7 Rep Power: 12	Hello Oliver, Thanks for your answer. I am used to more CFD-oriented CAD preprocessors like Gambit or ICEM where it is very simple to just split a block, insert vertices, faces etc.. It will take me some time to figure out how to do it in blender. I appreciate that it is not strictly necessary to have a real multi-block domain since with OpenFOAM one can stitch together sub-meshes. I do, however, like the idea of having a "nice" mesh at internal faces. -Sebastian