NonMatching::MeshClassifier for single point intersections

[Anne-Kathrin Wenske]

Dear all

I am using a cut finite element method to solve fluid-structure
interaction problems similarly to step-85.

In the current implementation of NonMatching::MeshClassifier, cells that
intersect the interface (given by a level set function) in only a single
vertex are classified as "intersected".

For my implementation I need those cells to be classified as strictly
"inside" or "outside" and modified the function location_from_dof_signs
accordingly. However, I am wondering whether there might be a case where
one wants those cells to actually count as "intersected" and would like
your opinion on this. Should those single point intersections count as
"intersected" or is "inside"/"outside" more reasonable?

Best

Anne

[Simon Sticko]

Hello.

> In the current implementation of NonMatching::MeshClassifier, cells that
> intersect the interface (given by a level set function) in only a single
> vertex are classified as "intersected".

Just to be clear: Are we talking about the situation where the zero contour goes exactly through a single cell corner?

Given the implementation, I had expected that such a cell would be classified as inside/outside.

Best,

Simon

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[Anne-Kathrin Wenske]

Hello Simon,

you are correct, I hadn't realized that this issue has also been adressed in issue #16950.

Best

Anne