Papers Published

  1. Dowell, Earl H., Eigenmode analysis in unsteady aerodynamics: Reduced order models, Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference no. 4 (1995), pp. 2545 - 2557 .
    (last updated on 2007/04/10)

    Abstract:
    A conceptually novel and computationally efficient technique for computing unsteady flow about isolated airfoils, wings, and turbomachinery cascades is presented. A large, sparse eigenvalue problem is solved using the Lanczos algorithm starting with either a time or frequency domain computational fluid dynamics (CFD) analysis of unsteady aerodynamics. Then, using the resulting eigenmodes, a Reduced Order Model of the unsteady flow is constructed. With the model, quick and accurate prediction of unsteady aerodynamic response of the system over a wide range of reduced frequencies can be obtained.

    Keywords:
    Wings;Airfoils;Unsteady flow;Cascades (fluid mechanics);Computational fluid dynamics;Eigenvalues and eigenfunctions;Frequency domain analysis;Time domain analysis;Mathematical models;Dynamic response;Algorithms;