Analysis of a FEM/BEM coupling method for transonic flow computations

Berger, H.; Warnecke, G.; Wendland, W.

doi:10.1090/S0025-5718-97-00878-8

Analysis of a FEM/BEM coupling method for transonic flow computations
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by H. Berger, G. Warnecke and W. L. Wendland PDF

Math. Comp. 66 (1997), 1407-1440 Request permission

Abstract:

A sensitive issue in numerical calculations for exterior flow problems, e.g. around airfoils, is the treatment of the far field boundary conditions on a computational domain which is bounded. In this paper we investigate this problem for two–dimensional transonic potential flows with subsonic far field flow around airfoil profiles. We take the artificial far field boundary in the subsonic flow region. In the far field we approximate the subsonic potential flow by the Prandtl–Glauert linearization. The latter leads via the Green representation theorem to a boundary integral equation on the far field boundary. This defines a nonlocal boundary condition for the interior ring domain. Our approach leads naturally to a coupled finite element/boundary element method for numerical calculations. It is compared with local boundary conditions. The error analysis for the method is given and we prove convergence provided the solution to the analytic transonic flow problem around the profile exists.

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