TCFD solver for transient, compressible fluid flow is called redDyMSolver. It was gradually developed during the time from the sonicFoam solver. In any matters the redDyMSolver 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, limits for variables can be specified and many other changes have been done.