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Only the notes changed on this branch were built. The rest of the site is not here, which is why this was quick.
Boundary conditions on non-planar boundaries¶
No flow through this wall is a single velocity component on a box and is not a component of anything on a sphere, a deformed mesh, or a surface with topography. Three ways to impose it — a direct penalty, Nitsche, and rotating the degrees of freedom — what each costs, and the one measurement that tells them apart.