Introduction

A range of shock wave topics have been under investigation. These range from the internal structure of a shock to shock wave reflection, refraction, diffraction, and interference (see Emanuel 1986, Chapter 19). Shock waves occur in both steady and unsteady flows. They may be associated with a wide variety of physical phenomena (e.g., chemical reactions that change the shock into a detonation wave). Interaction phenomena are also important, especially shock wave boundary-layer interaction.