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Coupling of a nonlinear finite element structural method with a Navier-Stokes solver
Authors:Raymond E Gordnier  Robert Fithen
Affiliation:a Air Force Research Laboratory, Computational Sciences Branch, Air Vehicles Directorate, AFRL/VAAC, Building 146 Rm 225, 2210 Eighth Street, Wright-Patterson AFB, OH 45433-7512, USA
b Department of Mechanical Engineering, Arkansas Tech University, Russellville, AR 72801, USA
Abstract:A new three-dimensional viscous aeroelastic solver is developed in the present work. A well validated full Navier-Stokes code is coupled with a nonlinear finite element plate model. Implicit coupling between the computational fluid dynamics and structural solvers is achieved using a subiteration approach. Computations of several benchmark static and dynamic plate problems are used to validate the finite element portion of the code. This coupled aeroelastic scheme is then applied to the problem of three-dimensional panel flutter. Inviscid and viscous supersonic results match previous computations using the same aerodynamic method coupled with a finite difference structural solver. For the case of subsonic flow, multiple solutions consisting of static, upward and downward deflections of the panel are discussed. The particular solution obtained is shown to be sensitive to the cavity pressure specified underneath the panel.
Keywords:Computational fluid dynamics  Navier-Stokes equations  Aeroelastic  Panel flutter  Nonlinear plate model  Finite element
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