Sampling on a patch

liu · May 23, 2005, 18:45

How to sample arbitrary point value at the patch if we have BoundaryField?

The problem I am solving is fluid structure interaction. Two meshes(one for fluid domain, the other for structure domain) are used. I can use patchToPatchInterpolation to couple the patches on both sides of the interface(BTW, could anybody give me an example of patchToPatchInterpolation?). But unfortunately, the structure problem is 2D. That means the patch on the structure side is an empty patch. In fact, I want to mapping a BoundaryField into a 2D volume mesh. One of the way to do this is just as my question: sample data on that patch.

Does anyone have good suggestions?

hjasak · May 24, 2005, 07:49

The patch to patch interpolation class is templated on the type of patch. Therefore, you should be able to create a patch by putting a cutting plane through your 2-D geometry and then doing patch-to-patch interpolation from the cut onto the boundary patch on the other side.

Enjoy,

Hrv

liu · May 24, 2005, 17:11

Thanks, Hrv.

Now I can mapping between the cutting plane and the fluid patch. The problem now is how to "mapping" between the cutting plane and the 2D volume.

I know that the cutting plane can sample the 2D volume.

hjasak · May 25, 2005, 06:52

Well, in FOAM a 2-D geometry will actually be a 1-cell thick layer of 3-D cells. If you put a cutting plane through it, you will get a 2-D slice and all will be well.

Enjoy,

Hrv

May 23, 2005, 18:45	How to sample arbitrary point	#1
liu Senior Member Xiaofeng Liu Join Date: Mar 2009 Location: State College, PA, USA Posts: 118 Rep Power: 17	How to sample arbitrary point value at the patch if we have BoundaryField? The problem I am solving is fluid structure interaction. Two meshes(one for fluid domain, the other for structure domain) are used. I can use patchToPatchInterpolation to couple the patches on both sides of the interface(BTW, could anybody give me an example of patchToPatchInterpolation?). But unfortunately, the structure problem is 2D. That means the patch on the structure side is an empty patch. In fact, I want to mapping a BoundaryField into a 2D volume mesh. One of the way to do this is just as my question: sample data on that patch. Does anyone have good suggestions? __________________ Xiaofeng Liu, Ph.D., P.E., Assistant Professor Department of Civil and Environmental Engineering Penn State University 223B Sackett Building University Park, PA 16802 Web: http://water.engr.psu.edu/liu/

May 24, 2005, 07:49	The patch to patch interpolati	#2
hjasak Senior Member Hrvoje Jasak Join Date: Mar 2009 Location: London, England Posts: 1,905 Rep Power: 33	The patch to patch interpolation class is templated on the type of patch. Therefore, you should be able to create a patch by putting a cutting plane through your 2-D geometry and then doing patch-to-patch interpolation from the cut onto the boundary patch on the other side. Enjoy, Hrv __________________ Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk

May 24, 2005, 17:11	Thanks, Hrv. Now I can mapp	#3
liu Senior Member Xiaofeng Liu Join Date: Mar 2009 Location: State College, PA, USA Posts: 118 Rep Power: 17	Thanks, Hrv. Now I can mapping between the cutting plane and the fluid patch. The problem now is how to "mapping" between the cutting plane and the 2D volume. I know that the cutting plane can sample the 2D volume. __________________ Xiaofeng Liu, Ph.D., P.E., Assistant Professor Department of Civil and Environmental Engineering Penn State University 223B Sackett Building University Park, PA 16802 Web: http://water.engr.psu.edu/liu/

May 25, 2005, 06:52	Well, in FOAM a 2-D geometry w	#4
hjasak Senior Member Hrvoje Jasak Join Date: Mar 2009 Location: London, England Posts: 1,905 Rep Power: 33	Well, in FOAM a 2-D geometry will actually be a 1-cell thick layer of 3-D cells. If you put a cutting plane through it, you will get a 2-D slice and all will be well. Enjoy, Hrv __________________ Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk

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