Having calculated the pressure p and velocity field v for a fluid structure interaction problem, defined over a mesh that encompasses both the fluid and the solid, I would like to find the drag acting on the solid. Previously I have done this by creating a mesh for the fluid part of the domain only …

See @MiroK ’s answer here: [image] Integrating over an interior surface variational formulation Hi, consider using restriction using + and -. Here foo('+') restricts foo to the positive cell and FacetNormal('+') is the outer normal of a positive cell. Following the discuss…

Integral over internal boundary using facet normal

kamensky March 13, 2019, 6:25pm 2

See @MiroK’s answer here:

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Integral over internal boundary using facet normal

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