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A hybrid boundary element — finite volume method for unsteady transonic airfoil flows

✍ Scribed by Hong Hu; Osama A. Kandil

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
590 KB
Volume
14
Category
Article
ISSN
0955-7997

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✦ Synopsis

A hybrid boundary element -finite volume method for unsteady transonic flow computation has been developed. In this method, the unsteady Euler equations in a moving frame of reference are solved in a small embedded domain (inner domain) around the airfoil using an implicit finite volume scheme. The unsteady full-potential equation, written in the same frame of reference and in the form of the Poisson equation, is solved in the outer domain using the integral equationboundary element method to provide the boundary conditions for the inner Euler domain. The solution procedure is a time-accurate stepping procedure, where the outer boundary conditions for the inner domain are updated using the integral equation -boundary element solution over the outer domain. The method is applied to unsteady transonic flows around the NACA0012 airfoil undergoing pitching oscillation and ramp motion. The results are compared with those of an implicit Euler equation solver, which is used throughout a large computational domain, and experimental data.

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