How to impose average velocity inlet condition?

[dokken]

@hussleJ6

Maybe this is a bit a silly question, but does this code apply to taking the normal to a certain facet?

Yes, it uses ufl.FacetNormal to do an interpolation into the space whose degrees of freedom are located at a certain boundary.

One can of course also use projection routines, similar to:

How to compute tangent vectors on facets (2D surface parametrization)

Hi deshik, Since there is no detailed specification of what programming language/package you are using to attempt this I went ahead and assumed that an implementation based on dolfinx is fine for you. In this gist you can find a code for approximating facet vectors on all facets or a subset of facets on a dolfinx mesh. The function has a flag tangent. When this flag is set to False the facet normal vectors will be approximated, whereas the facet tangent vectors are approximated when the flag i…

to compute the normal vector as well.