### evaluate boundary normal

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Hi:

I am solving a fluid structure interaction problem, using ALE, partitioned solver, each time the solid moves, it changes its configuration, with all the coordinate of mesh and dof know, how could I efficiently evaluate its boundary normal n , so that I could mulitpy p with n to get the neumann boundary condition?

Any advise would be appreciated!

Yuxiang

I am solving a fluid structure interaction problem, using ALE, partitioned solver, each time the solid moves, it changes its configuration, with all the coordinate of mesh and dof know, how could I efficiently evaluate its boundary normal n , so that I could mulitpy p with n to get the neumann boundary condition?

Any advise would be appreciated!

Yuxiang

Community: FEniCS Project

### 1 Answer

1

`n = FacetNormal(mesh)`

written
10 months ago by
Yuxiang Lin

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