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This paper considers the nonlinear and unsteady loads environment of an agile highspeed vehicle with reaction control jets, a large flight envelope, and structural degrees of freedom to account for the flexibility of the slender vehicle. Steady-state and unsteady CFD solutions of the fluid-structure-jet interaction are calculated throughout the flight envelope to build a reduced order model. Two surrogate modeling methods are compared to assess the applicability to the fluid-structure-jet interaction and wide variation in flight conditions: a CFD-based steady-state Kriging approximation and linear convolution with a nonlinear correction. The surrogate models are then compared to FUN3D CFD solutions to verify their accuracy. Overall, this work bridges the gap between system identification at single flow conditions and flight simulations of an unknown trajectory.

Unsteady Fluid-Structure-Jet Interaction Modeling Methods for Agile High-Speed Vehicles