This presentation focusses on two fundamental flow phenomena: (1) the interactions between shock waves and liquid interfaces; and (2) thermochemical non-equilibrium flows that a vehicle experiences at Mach numbers higher than 5. These research endeavors are motivated by complex physiochemical processes relevant to high-speed propulsion, an understanding of which is critical to the development of next-generation liquid-fueled hypersonic vehicles. In the first part of the presentation, results from a recent study that quantitatively investigates the fundamental physics underlying near-field deformation and fragmentation behavior of single and multiple liquid cylinders placed in the path of a traveling normal shock wave using high-fidelity numerical simulations. The mathematical formulation to investigate this multiphase problem is based on a modified 5-equation Kapila model that incorporates pressure-relaxation, viscous, and surface tension effects. The second part of the presentation will focus on the fluid dynamics resulting from the interactions between a Mach 11 flow and a 25° ramp embedded with a rectangular cavity. The discussion will be based on high-fidelity simulations that take into account thermal and chemical non-equilibrium processes and conjugate heat transfer.
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