Abstract
The validation for a boundary element formulation for the combined potential–flow aerodynamic and aeroacoustic analysis of bodies in arbitrary motion (applicable for instance to a tiltrotor during the conversion phase) is presented. The formulation, introduced in the past by the authors, is based on the velocity potential for compressible flows. The distinguishing feature being validated is the fact that the boundary integral representation is written for a surface that moves in arbitrary motion with respect to a frame of reference that in turn moves in arbitrary motion with respect to the undisturbed air. Thus, the integrals are evaluated on the emission surface, which is the locus of the emitting points at the moving–frame locations that they had when the signal influencing a given point at a given time was emitted. Numerical validation results are presented for helicopter rotors in hover and forward flight.
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