Аннотация:https://journals.ioffe.ru/articles/53363DOI: 10.21883/TPL.2022.13.53363.18889Within the framework of the Euler equations, a numerical study of the structure of a self-similar flow for various types of negative Mach reflection during diffraction of a shock wave by a wedge is performed. Along with the known modes of double and triple Mach reflection, a qualitatively new mode of negative Mach reflection with multiple three-shock configurations is observed. Peculiarities of the transition from multiple Mach reflection to regular reflection when changing the wedge angle are noted.This work has been performed in the Research Instituteof Mechanics of the Lomonosov Moscow State Universitywith financial support of the Russian Science Foundation(project 21-11-00307)