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