We report development and application of a fluid-structure interaction (FSI)solver for compressible flows with large-scale flow-induced deformation of thestructure. The FSI solver utilizes partitioned approach to strongly couple asharp-interface immersed boundary method based flow solver with an open-sourcefinite-element structure dynamics solver. The flow solver is based on ahigher-order finite-difference method on Cartesian grid and employs ghost-cellmethodology to impose boundary conditions on the immersed boundary. Ahigher-order accuracy near the immersed boundary is achieved by combining theghost-cell approach with a weighted least-square error method based on ahigher-order approximate polynomial. The second order spatial accuracy of theflow solver is established by performing a grid refinement study. The structuresolver is validated with a canonical elastostatics problem. The FSI solver isvalidated with published measurements and simulations for the large-scaledeformation of a thin elastic steel panel subjected to blast loading in a shocktube. The solver correctly predicts oscillating behavior of the tip of thepanel with reasonable fidelity and computed shock wave propagation isqualitatively consistent with the published results. In order to demonstratethe fidelity of the solver and to investigate coupled physics of theshock-structure interaction for a thin elastic plate, we employ the solver forsimulating 6.4 kg TNT blast loading on the thin elastic plate. The initialconditions of the blast are taken from field tests reported in the literature.Using numerical schlieren, the shock front propagation, Mach reflection andvortex shedding at the tip of the plate are visualized during the shock waveimpact on the plate. We discuss coupling between the non-linear dynamics of theplate and blast loading.
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