In pointPatchField, how to read coordinate values of mesh

nbyjn · December 18, 2014, 08:40

Hello foamers:
I want to write a new boundary based on oscillatingDisplacementPointPatchField. I want to give this boundary different values based on the mesh's coordinate values. Not a single value of the patch's coordinate, I mean different values on different girds. In this field, I can't use mesh.C() because "mesh" is not defined.
Do you have any idea? Thank you!

JNSN · December 18, 2014, 11:03

This may work

Code:

const polyMesh& mesh = this->dimensionedInternalField().mesh()();

nbyjn · December 19, 2014, 05:51

Quote:

Originally Posted by JNSN

This may work

Code:

const polyMesh& mesh = this->dimensionedInternalField().mesh()();

Thank you for your quick reply!
But I think polyMesh only contains patch/face information, you can't get mesh coordinates from this.

kmooney · December 19, 2014, 15:44

I'm a little confused. Are you trying to, from a boundary condition, access the point positions of boundary mesh?

nbyjn · December 19, 2014, 23:52

Quote:

Originally Posted by kmooney

I'm a little confused. Are you trying to, from a boundary condition, access the point positions of boundary mesh?

Yes, that's my point! Please forgive my poor English.
Do you have any ideas?
Thank you!

kmooney · December 20, 2014, 13:21

Try this from within updateCoeffs()

[CODE]
const pointPatch& ptPatch = this->patch();
pointField myPoints = ptPatch.localPoints();
[/CODE

I hope that helps!

We actually have a pretty thorough discussion of this type of boundary condition in The OpenFOAM Technology Primer:
http://www.sourceflux.de/book/

I urge you to consider picking up a copy!

Cheers,
Kyle

December 18, 2014, 08:40	In pointPatchField, how to read coordinate values of mesh	#1
nbyjn New Member Jarvis Join Date: Jun 2013 Posts: 14 Rep Power: 12	Hello foamers: I want to write a new boundary based on oscillatingDisplacementPointPatchField. I want to give this boundary different values based on the mesh's coordinate values. Not a single value of the patch's coordinate, I mean different values on different girds. In this field, I can't use mesh.C() because "mesh" is not defined. Do you have any idea? Thank you!

December 18, 2014, 11:03		#2
JNSN Senior Member Jan Join Date: Jul 2009 Location: Hamburg Posts: 137 Rep Power: 19	This may work Code: const polyMesh& mesh = this->dimensionedInternalField().mesh()();

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December 19, 2014, 15:44		#4
kmooney Senior Member Kyle Mooney Join Date: Jul 2009 Location: San Francisco, CA USA Posts: 323 Rep Power: 17	I'm a little confused. Are you trying to, from a boundary condition, access the point positions of boundary mesh?

December 20, 2014, 13:21		#6
kmooney Senior Member Kyle Mooney Join Date: Jul 2009 Location: San Francisco, CA USA Posts: 323 Rep Power: 17	Try this from within updateCoeffs() [CODE] const pointPatch& ptPatch = this->patch(); pointField myPoints = ptPatch.localPoints(); [/CODE I hope that helps! We actually have a pretty thorough discussion of this type of boundary condition in The OpenFOAM Technology Primer: http://www.sourceflux.de/book/ I urge you to consider picking up a copy! Cheers, Kyle