Adaptive unstructured simulation of three-dimensional blast waves with ground surface effect

The paper deals with investigations of threedimensional blast wave propagations and their interactions with ground surface. A locally adaptive three-dimensional unstructured Godunov-type vectorized Euler solver has been applied on the Cray C-90 supercomputer platform. Modifications to the mathematical model, numerical algorithm and code for the problem under study are discussed in detail with emphasis on grid generation and adaptation. Special attention has been also paid to setting of initial conditions and their influence on the remote overpressure distributions. As an example, the paper reports 360 degree long-distance threedimensional computation of blast wave propagation induced by an imaginary explosion in the vicinity of the Tanegashima Space Center. Some comparisons with the respective flat case and quasi-1-D solution are included. Applicability of the employed 'Research Associate, Shock Wave Research Center, Member AIAA t Visiting Professor, Shock Wave Research Center; permanent address: Advanced Technology Center, P.O. Box 968, St. Petersburg 199226, Russia * Professor, Director of Shock Wave Research Center, Member AIAA 5 Senior Researcher, Service Division ^ Senior Engineer, Safety Control Department II Associate Senior Engineer, Safety Control Department Copyright ©1998 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission. approach to blast wave interactions with a complex surface including terrain and buildings is also demonstrated and some general conclusions regarding safety conditions are given.