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Method and system for a quick calculation of aerodynamic forces on an aircraft

  • US 7,987,081 B2
  • Filed: 02/19/2008
  • Issued: 07/26/2011
  • Est. Priority Date: 12/18/2007
  • Status: Expired due to Fees
First Claim
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1. A computer-aided method for assisting in a design of an aircraft by providing aerodynamic forces, skin values or values distribution around a complete aircraft or an aircraft component, comprising:

  • a) selecting a set of parameters of said complete aircraft or said aircraft component, for computing said aerodynamic forces, skin values or values distribution dependant of said parameters;

    b) performing flow field Computational Fluid Dynamic Reynolds Averaged Navier-Stokes (CFD RANS) computations and calculating and storing said aerodynamic forces, skin values or values distribution for different combinations of values of a limited set of parameters;

    c) computing Proper Orthogonal Decomposition (POD) modes of flow variables;

    d) expanding the flow variables using said POD modes;

    e) obtaining POD coefficients of said expanded flow variables using a genetic algorithm that minimizes an error associated with expansion of Navier-Stokes equations;

    f) generating a reduced-order model using the POD modes and the POD coefficients; and

    g) obtaining said aerodynamic forces, skin values or values distribution for different combinations of values of the selected set of parameters through reduced-order model.

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