# Helmholtz brick¶

This brick represents the complex or real Helmholtz problem:

$\Delta u + k^2 u = \ldots$

where $$k$$ the wave number is a real or complex value. For a complex version, a complex model has to be used (see tests/helmholtz.cc).

The function adding a Helmholtz brick to a model is:

getfem::add_Helmholtz_brick(md, mim, varname, dataexpr, region);


where varname is the variable on which the Helmholtz term is added and dataexpr is the wave number.