In pointPatchField, how to read coordinate values of mesh
 

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!

This may work

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

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!

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