Efficient algorithm for solution of the unsteady transonic small-disturbance equation | Zendy

John T. Batina | Zendy

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Efficient algorithm for solution of the unsteady transonic small-disturbance equation

Author(s) -

John T. Batina

Publication year - 1988

Publication title -

journal of aircraft

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.64

H-Index - 94

eISSN - 1533-3868

pISSN - 0021-8669

DOI - 10.2514/3.45629

Subject(s) - transonic , freestream , linearization , convergence (economics) , supersonic speed , stability (learning theory) , mathematics , flow (mathematics) , algorithm , control theory (sociology) , aerodynamics , computer science , mechanics , nonlinear system , physics , geometry , control (management) , artificial intelligence , quantum mechanics , machine learning , reynolds number , turbulence , economics , economic growth

A time accurate approximation factorization (AF) algorithm is formulated for solution of the three-dimensional unsteady transonic small-disturbance equation. The AF algorithm consists of a time linearization procedure coupled with a Newton iteration technique. Superior stability characteristics of the new algorithm are demonstrated through applications to steady and oscillatory flows at subsonic and supersonic freestream conditions for an F-5 fighter wing. For steady flow calculations, the size of the time step is cycled to achieve rapid convergence. For unsteady flow calculations, the AF algorithm is sufficiently robust to allow the step size to be selected based on accuracy rather than on stability considerations. Therefore, accurate solutions are obtained in only several hundred time steps yielding a significant computational cost savings when compared to alternative methods.

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