Unlike the Phase 1 simulations, in which there is a shocktube gas (gas1) and a lensing gas (gas2), here the lens is absent (ie gas1 = gas2). The initial shock speed (M=1.34521) matches the strength of the transmitted shock in the lens case.

In addtion, there is a target gas inside the wedge (gas3). For the simulation presented here, the target gas was taken to have gamma 1.09 and a density related to gas2 by gas3/gas2 = 5. This would be consistent with using Air for the other gas and SF6 for the target gas.

Unlike the 2D Phase 2 simulations with interface perturbations, no perturbations were put on the interface between the Air and target (SF6) to stimulate the development of a Richtmyer-Meshkov instability. But an RMI does develop in this case, resulting from the fact that the contact is not aligned with the shock. Interestingly, the growth of the RMI is similar to the 2D Phase 2 simulation without interface perturbations.

The extended clawpack solvers were used for this simulation, the code is documented and the input files can be found in the repository. A base resolution of 250x100 was used with 4 additional levels of refinement (factors 2,2,2,2).

Here is an animation of the flow evolution.

-- DavidHill - 15 Nov 2005