Sound-Flow Interactions -

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Résumé :
Thenheintroducesveryclearlythescatteringofsoundbecauseofvorticity andgivesthemostrecentresultsonultrasoundpropagationthroughadis- dered?ow. V. Ostashevpresentsgeometricalacousticsinmovingmediaand theimportantpracticalproblemofsoundpropagationinturbulence(at- sphere,ocean). A. Fabrikantexaminestheplasm?hydrodynamicsanalogies includingtheresonantwave-?owinteractioninshear?ows,wavesofnegative VI Preface energyandover-re?ectionandacousticoscillatorsin?uid?ows. P. J. Mor- sondescribesthedynamicsofthecontinuousspectrumwhichoccursinshear ?ow. Theresultsareinterpretedinthecontextofin?nitedimensionalHam- toniansystemstheory. G. Chagelishvilipresentsnewlinearmechanismsof acousticwavegenerationinsmoothshear?owsusinganon-modalstudy. N. Peakepresents?uid?structureinteractionsinthepresenceofmean?ows, includingtheproblemsofinstabilityandcausality. Finally,W. Lauterborn presentsnonlinearacousticswithapplicationstosonoluminescenceandto acousticchaos. InthisCarg`eseSummerSchool,54studentsfrom12nations,and11l- turersfrom7nationsparticipated. Aknowledgements. TheSummerSchoolandthispublicationwouldnot havebeenpossiblewithout: ??nancialsupportfromtheEuropeanUnion,theCentreNationaldela RechercheScienti?que,theMinist`eredesA?airesEtrang`eres,theM- ist`eredel?EducationNationale,delaRechercheetdelaTechnologieand theGroupementdeRecherche?Turbulence?; ?the guidance of Elisabeth Dubois?Violette, director of the Institut d?EtudesScienti?quesdeCarg`ese; ?thehelpofChantalAriano,NathalieBedjai,BrigitteCassegrain,Pierre- EricGrossiandthewholeteaminpreparingandhostingofthisschool. Finally,wewishtothankthelecturersforgivingsomuchtimeinprep- ingthelecturesandwritingthemup,aswellasmakingthemselvesavailable fordiscussionsduringtheschool. 1 LeMans,Paris,Lyon YvesAur?egan , 2 September2001 Agn`esMaurel , 1 VincentPagneux , 3 Jean-Fran?coisPinton . 1 Laboratoired?Acoustiquedel?Universit?eduMaine,UMRCNRS6613, Av. OMessiaen,72085LeMansCedex9,France 2 LaboratoireOndesetAcoustique,UMRCNRS7587, ESPCI,10r

Sommaire:
A Primitive Approach to Aeroacoustics.- Lectures on the Theory of Vortex-Sound.- Sound-Vortex Interaction in Infinite Media.- Geometrical Acoustics in Moving Media.- Sound Propagation and Scattering in Random Moving Media.- Plasma-Hydrodynamic Analogy for Waves and Vortices in Shear Flows.- New Linear Mechanisms of Acoustic Wave Generation in Smooth Shear Flows (Nonmodal Study).- Singular Eigenfunctions and an Integral Transform for Shear Flow.- Structural Acoustics with Mean Flow.- Nonlinear Acoustics and Acoustic Chaos....