* \brief A simple Navier-Stokes test problem for the staggered grid (Navier-)Stokes model. This test uses the same set-up as the horizontal test but uses a harmonic averaging of the diffusion coefficients at the interface for ficks law and comares the solution with the maxwell stefan coupling
* \ingroup BoundaryTests
* \brief A simple Navier-Stokes test problem for the staggered grid
* (Navier-)Stokes model.
*
* This test uses the same set-up as the horizontal test but uses a harmonic
* averaging of the diffusion coefficients at the interface for Fick's law and
* compares the solution with the Maxwell-Stefan coupling.