Proper orthogonal decomposition technique for transonic unsteady aerodynamic flows

A new method for constructing reduced-order models (ROM) of unsteady small-disturbance flows is presented. The reduced-order models are constructed using basis vectors determined from the proper orthogonal decomposition (POD) of an ensemble of small-disturbance frequency-domain solutions. Each of the individual frequency-domain solutions is computed using an efficient time-linearized flow solver. We show that reduced-order models can be constructed using just a handful of POD basis vectors, producing low-order but highly accurate models of the unsteady flow over a wide range of frequencies. We apply the POD/ROM technique to compute the unsteady aerodynamic and aeroelastic behavior of an isolated transonic airfoil and to a two-dimensional cascade of airfoils.

Duke Scholars

Author Kenneth C. Hall Thomas Lord Department of Mechanical Engineering and Materia ...

Author Jeffrey P. Thomas Thomas Lord Department of Mechanical Engineering and Materia ...

Author Earl H. Dowell Thomas Lord Department of Mechanical Engineering and Materia ...