Vitaliy Krivets

Shock tube experiments and numerical simulation of the single-mode, three-dimensional Richtmyer–Meshkov instability

A vertical shock tube is used to perform experiments on the single-mode three-dimensional Richtmyer-Meshkov Instability. The interface is formed using apposed flows of air and SF6 and the perturbation is created by the periodic motion of the gases within the shock tube. Planar laser induced fluorescence is used for flow visualization. Experimental results were obtained with a shock Mach number of 1.2. A three-dimensional numerical simulation of this experiment was conducted the results of which are compared with the experimental images and measurements.

Richtmyer-Meshkov Instability Shock Tube Experiments with Mixing Measurements

Richtmyer-Meshkov instability with three-dimensional random initial interface perturbations is studied in vertical shock tube experiments. In the beginning flat diffused interface between SF6 and air is formed by opposed gas flows, and perturbations are produced applying Faraday waves. Planar laser Mie scattering images of the mixing process are recorded at 6 kHz frequency. A new method for images processing is developed allowing reliable integral mixing measurements. Time dependent integral mixing layer widths are obtained using two different sets of experiments and both the logarithmic method and Mikaelian’s model [1] are used to extract growth exponents, θ . The time dependent mixedness is also calculated.