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Titolo:
Interaction of a shock wave with two counter-rotating vortices: Shock dynamics and sound production
Autore:
Pirozzoli, S; Grasso, F; DAndrea, A;
Indirizzi:
Univ Roma La Sapienza, Dipartimento Meccan & Aeronaut, I-00184 Rome, ItalyUniv Roma La Sapienza Rome Italy I-00184 & Aeronaut, I-00184 Rome, Italy
Titolo Testata:
PHYSICS OF FLUIDS
fascicolo: 11, volume: 13, anno: 2001,
pagine: 3460 - 3481
SICI:
1070-6631(200111)13:11<3460:IOASWW>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
EFFICIENT IMPLEMENTATION; VORTEX INTERACTIONS; SCHEMES; GENERATION; FLOWS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Pirozzoli, S Univ Roma La Sapienza, Dipartimento Meccan & Aeronaut, Via Eudossiana 18, I-00184 Rome, Italy Univ Roma La Sapienza Via Eudossiana 18 Rome Italy I-00184 y
Citazione:
S. Pirozzoli et al., "Interaction of a shock wave with two counter-rotating vortices: Shock dynamics and sound production", PHYS FLUIDS, 13(11), 2001, pp. 3460-3481

Abstract

In the present paper the interaction of a planar shock wave with a pair ofcounter-rotating vortices is studied by means of extensive numerical simulations. The main objective of the study is to characterize the shock pattern and the nature of the acoustic field. For the purpose of shedding some light into the mechanism of sound generation, the acoustic analogy developed by the present authors for the interaction of a shock wave with an isolatedvortex has been extended to the case of a vortex pair, so as to obtain a closed form solution for the acoustic far field pressure in the limit of weak vortices. The effect of various parameters, such as the shock and vortex strengths and the initial vortex separation distance has been investigated,and their influence on the dynamics has been assessed. In addition, we have also considered both the case of passing and colliding pairs. In the caseof a colliding pair five types of interactions are found to occur, depending upon the value of the interaction parameter, defined as the ratio of thevortex pair intensity over the shock strength. With regard to the acousticfield, the simulations have shown that the latter is the result of two mechanisms: the one directly associated to the interaction itself, and the onerelated to the coupling process of the vortex pair. The former mechanism is controlling if the interaction is weak, while for strong interactions theacoustic field is also controlled by the sound generated through the coupling process. For all cases the acoustic pressure field exhibits a multipolar directivity pattern with at least four sound peaks along the radial direction; however, if the vortex pair intensity is large the sound waves trailing the precursor are not clearly distinguishable. Shock wave-passing vortexpair interactions exhibit only three types of shock patterns, as in the case of shock wave-isolated vortex interaction; however, the acoustic field exhibits the same features as in the colliding case. (C) 2001 American Institute of Physics.

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Documento generato il 29/03/20 alle ore 12:13:35