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High-Fidelity Simulation of Shock/Surface Interactions over Blunt Bodies at Hypersonic Flow Conditions
The objective of this research is to investigate the effects of compressibility on the interaction of bow shocks with a blunt body at a wide range of hypersonic flow conditions. The nonlinear hydrodynamic flow over a sphere was modeled by using a fully compressible solver, called FLASH, based on the 3D solution of the unsteady Euler hydrodynamic equations and executed on US Army Combat Capabilities Development Command Army Research Laboratory supercomputers. The study was conducted using argon at 13.3 kPa to eliminate the effects of dissociation and ionization, and compared with the experimental benchmark results for validation purposes. The results were parameterized to understand the effects of compressibility on the shock standoff distance at a range of supersonic to hypersonic conditions including Mach number 212. The theoretical models reported were also used for comparison and analysis. The simulated results yielded excellent correlations with both experiments and theory in terms of the shock standoff distance. The simulations were able to describe the mechanism leading to a rapid onset of shock detachment distance, shock cone angle, and vorticity production at higher Mach numbers. Future works will involve extending this analysis by introducing chemical kinetics dissociation to move toward more-complex hypersonic operational environments.
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