TCFD solver for steady state, compressible fluid flow is called redSolver. It was gradually developed during the time from the rhoSimpleFoam solver. In any matters the redSolver behaves the same way as any standard OpenFOAM solver. It is compatible with all OpenFOAM applications and libraries. Solver is modified to be more robust, it can use MRF method, limits for variables can be specified and many other changes have been done.