Book of Papers, 24th Int. Congr. on Theoretical and Applied Mechanics (ICTAM)

Shock wave reflection from concave surfaces including a purely cylindrical concave reflector and a composite one consisting ofa concave cylindrical arc transitioning to a straight inclined surface is the subject of the present study. A combined – theoretical, numericaland experimental – approach is used. The main attention is given to the transition from a Mach reflection to a regular reflection. Newtheoretical predictions of the transition are based on the information on the corner signal propagation obtained from numerical simulationsvia an original signal tracking technique. Numerical simulations are carried out using the Euler and Navier-Stokes models. State-of-the-arttime-resolved optical flow visualization is employed in shock tube experiments. The obtained results and conclusions significantly alter thecurrent state of knowledge about the phenomena