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how to compute the flux through a part of the boundary

See original GitHub issue

A common postprocessing operation is the computation of the flux through a part of the boundary which has had an isopotential boundary condition imposed. I haven’t quite worked out how to evaluate this.

I have in a branch of examples/ex13.py (which is atop #47) computed the gradient of the potential using derivative, but haven’t figured out how to then integrate the normal component of this over just a part of the boundary, say that corresponding to mesh.boundaries['ground'].facets.

Is there a facility for restricting a linear_form to a Submesh?

Issue Analytics

  • State:closed
  • Created 5 years ago
  • Comments:5 (5 by maintainers)

github_iconTop GitHub Comments

1reaction
kinnalacommented, Sep 20, 2018

One can now give Submesh to FacetBasis constructor via the keyword argument submesh.

The resulting FacetBasis is nonzero only on the submesh.

0reactions
gdmcbaincommented, Sep 21, 2018

Awesome! Thank you. I have extended ex13 to demonstrate this. #56

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