Viscous and thermal losses

LossyGlobalOuter(mesh::Mesh, freq;
            m=3,n=3,l=90,p=90,S=-1,sparsity=20.0,
            exterior=true,adaptive=false)

A LinearMap corresponding to the reduced lossy system.

LossyGlobalInner

A LinearMap corresponding to the inner system of the reduced lossy system.

interpolation_function_derivatives(mesh)

Returns interpolation function derivative matrics $(\mathbf{D}_x,\mathbf{D}_y,\mathbf{D}_z)$ of the 'physics_function'. This means that given the BEM interpolation of p the derivatives are given by

\[ \frac{\partial\mathbf{p}^\parallel}{\partial x} = \mathbf{D}_x\mathbf{p}, \newline \frac{\partial\mathbf{p}^\parallel}{\partial y} = \mathbf{D}_y\mathbf{p}, \newline \frac{\partial\mathbf{p}^\parallel}{\partial z} = \mathbf{D}_z\mathbf{p}.\]

NOTE! This is only the tangential part of the gradient. The reason being that the BEM interpolation on deal with surface values, and does therefore not contain the derivative information orthogonal to it.

count_elements_pr_node(mesh)

Counting the number of elements that each node is part of (Cornes can have various of numbers. Midpoints only 2.)