The pseudo-steady shock reflection process as predicted by the von Neumann theory and by the SHARC-code.

If the Neumann Theory in its original form is applied on the pseudosteady shock reflection process and compared with experimental data agreement can be found in some limited domains, on the other hand significant disagreements, called the von Neumann Paradoxes, appear. The reasons are discussed in the present paper as well as series of parametric calculations simulating the reflection of plane incident shocks with Mach numbers 1.26 and 3.36, resp., at wedges with different angles are presented. The experimental data obtained by evaluation of the direct pressure measurements excellently agree with the results of the numerical code calculations applying SHARC. The classical von Neumann Theory well predicts regular reflection (RR) and strong Mach reflection (MR) but totally fails in other cases. The conclusion is that this Theory contains flaws due to the fact that its boundary conditions are not entirely met in the experimental process, and therefore has to be considered as an approximat e one. The results of the numerical simulations shed new light on the Paradoxes especially on that one of "Weak Mach Reflection", and show that the "Second Peak" in Double Mach reflection (DMR) is well predicted.