Material deformation and pitting from cavitation bubble collapse is investigated using fluid and material dynamics and their interaction. In the fluid, a novel hybrid approach, which links a boundary element method and a compressible finite difference method, is used to capture non-spherical bubble dynamics and resulting liquid pressures efficiently and accurately. The bubble dynamics is intima...

Bow-shock standoff distances over sphere and spherically-blunted cone geometries were examined through experiments in two facilities capable of high-stagnation enthalpy hypersonic flows simulating Mars planetary entry conditions. High-speed high-resolution schlieren images obtained the California Institute Technology T5 reflected shock tunnel Hypervelocity Expansion Tube to examine facility ind...

A non-thermal technique using a plasma spike, generated by 60 Hz periodic electric discharge, for shock wave mitigation is presented. The experiments were conducted in a Mach 2.5 wind tunnel. A plasma spike was generated in front of a wind tunnel model; it led to a transformation of the shock from a well-defined attached shock into a highly curved shock structure, which had increased shock angl...

The rotational relaxation time of an air mixture is modified as approach to improve accuracy when predicting hypersonic shock standoff distance. A novel atomistic quasi-classical trajectory (QCT) method with a devised drastically reduce computational cost, and rigorously model the N2 in N2–N N2–N2 collisions. calculated full sets state-to-state transition rates obtained by QCT are fed into stat...

Abstract This paper reports the experiments on shock standoff distance (SSD) around spheres flying at Mach numbers from slightly below 1.0. Spheres of same diameter but three different densities were launched in a ballistic range by light-gas gun, and flow field each sphere was measured optical visualization. The purpose this study is to investigate how projectile deceleration influences SSD co...

The effect of thermal nonequilibrium on shock interactions carbon dioxide (CO 2 ) hypersonic flows is investigated. Given the relatively low characteristic vibrational temperature CO molecule, it expected that excited modes play a significant role in physics shock/shock and shock/boundary layer interactions. interference mechanism resulting from -dominated flow over different double-wedge geome...

We report on a multi-wavelength analysis of the 26 January 2014 solar eruption involving coronal mass ejection (CME) and Type-II radio burst, performed by combining data from various space-and ground-based instruments. An increasing standoff distance with height shows presence strong shock, which further manifests itself in continuation metric burst into decameter-hectometric (DH) domain. A plo...