The paper deals with the numerical solution of the Ffowcs Williams-Hawkings equation on a rotating supersonic domain. Based on the emission surface algorithm, the adopted solver performs the integration on the so called 'acoustic domain' in order to avoid the Doppler singularity in the integral kernels. The presence of multiple emission times for the supersonic source points and the particular time evolution of the integration domain force to use a particular data-fitting procedure on both the geometrical and integral quantities. The algorithm may be used in the numerical prediction of the quadrupole source term for helicopter rotors operating at a high transonic regime and in aeroacoustic analysis of the modern propeller blades, rotating at supersonic tip speed.
An algorithm to integrate the Ffowcs Williams-Hawkings equation on a rotating, supersonic domain
Ein Algorithmus zur Integration der Ffowcs Williams-Hawkings-Gleichung im supersonischen Rotations-Bereich
1998
14 Seiten, 16 Bilder, 14 Quellen
Aufsatz (Konferenz)
Englisch
Hubschrauber , Rotor (Drehflügel) , akustische Eigenschaft , transsonischer Geschwindigkeitsbereich , Überschallgeschwindigkeit , Rechenmodell , Strömungsgleichung , Lösung (Ergebnis) , Algorithmus , Schallemission , akustischer Doppler Effekt , Singularität (Mathematik) , Integration (Mathematik) , Vorhersage , numerisches Verfahren , Quadrupol , Aeroakustik
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