Aeroelastic Coupling between a Thin Divergent and High Pressure Jets
Keywords:
fluid/structure interaction, Arbitrary-Lagrangian-Eulerian formulation, divergent, supersonic jet, Euler equationsAbstract
Rocket divergents concentrate the engine thrust on a light structure. This thrust may provoke deformations, and these deformations may influence the jet. For analysis, we formulate a coupled fluid/structure/moving grid problem, which leads to a numerical model involving a three-field Arbitrary Lagrangian- Eulerian method offering second-order spatial accuracy. It employs a time-staggered procedure for global second-order accurate time-integration of the corresponding coupled semi-discrete equations. We present the transient aeroelastic response obtained with a simplified geometry of divergent when the flow condition induces shock waves either behind or inside the nozzle, for structural designs of small stiffness.
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