[mistuning]

Hi everyone,

I am trying to solve the lid-driven cavity problem for incompressible flows. In the current version, it seems only the compressible flows of this kind of problem can be solved. In the codes for applying the moving wall boundary condition, only the terms for energy conservation equation in the convective and viscous residuals are corrected with the wall velocity. However, there is not such a equation for incompressible flow. In the older versions of SU2, the wall velocity is applied as Dirichlet boundary condition, so can we still use this method for incompressible flows? Can anyone give some comments on that? Thanks in advance.

[economon]

Hi,

Indeed, the current implementation of moving walls was written with compressible flow in mind. However, we also apply a Dirichlet boundary condition for the momentum equations in compressible flow as well (along with a weak flux for the energy equation). Please see the no-slip boundary condition in the subroutine here:

void CNSSolver::BC_HeatFlux_Wall(CGeometry *geometry, CSolver **solver_container, CNumerics *conv_numerics, CNumerics *visc_numerics, CConfig *config, unsigned short val_marker)

Perhaps this might give you some ideas on implementation for incompressible flow (I suspect that a similar Dirichlet condition would be appropriate for the velocity).

Hope this helps,
Tom