Dynamic Simulations of Atmospheric-Entry Capsules

摘要

Viscous free-oscillation simulations with theOVERFLOW solver are used to predict the aerodynamic behavior ofnnonlifting capsule shapes in the supersonic-speed regime. Computations using hybrid Reynolds-averaged Navier–nStokes turbulence models are examined for two novel atmospheric-entry capsule configurations: an idealizedninflatable decelerator concept and the Orion crew module. The simulation results are validated against nonlinearnaerodynamic models determined from free-flight ballistic-range data analysis. For the Orion crew module, twonseparate methods of reducing identical range data, along with common models tested in separate range facilities, arenincluded. The computations demonstrate the efficiency and accuracy of dynamic simulations for developing annonlinear aerodynamic performance database. Analysis indicates that the typical nonlinear bluff-body behavior isncharacterized by a rate-dependent dynamic response, which is not currently accounted for in common aerodynamicnmodels.