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The simulation of surface ship micro-bubble wakes

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dc.contributor.authorHyman, Mark C.en
dc.contributor.committeechairSchetz, Joseph A.en
dc.contributor.committeememberJakubowski, Antoni K.en
dc.contributor.committeememberHallauer, William L. Jr.en
dc.contributor.committeememberNikolaidis, Efstratiosen
dc.contributor.committeememberLiapis, Stergios I.en
dc.contributor.departmentAerospace Engineeringen
dc.date.accessioned2014-03-14T21:18:11Zen
dc.date.adate2008-08-25en
dc.date.available2014-03-14T21:18:11Zen
dc.date.issued1990-04-05en
dc.date.rdate2008-08-25en
dc.date.sdate2008-08-25en
dc.description.abstractA method in which the transport and evolution of the bubble population in a surface ship wake is numerically simulated is presented. The simulation is accomplished by constructing an advective-diffusive transport model for the scalar bubble field and solving this model for late times after ship passage. The bubble population model requires convection velocities and turbulent diffusion information that is supplied by solving the Reynolds-averaged parabolized Navier-Stokes equations with a <i>k</i> - ∊ turbulence model. The mean flow equations are solved by approximating the differential equations with a second order accurate finite difference scheme. The resulting large, sparse, banded matrix is solved by applying a version of the conjugate gradient method. The method has proven to be efficient and robust for the free shear flow problems of interest here. The simulation is initiated with given information in a plane at some point downstream of the ship from which the solution is propagated. The model is executed for a single and a twin propeller ship at 15 knots. The simulation shows that the development of the hydrodynamic and bubble near wake is dominated by ship geometry via strong advective transport. The far wake is dominated by diffusion and bubble rise and dissolution. Thus relatively large changes in geometry have a limited influence on the far wake.en
dc.description.degreePh. D.en
dc.format.extentx, 146 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-08252008-161944en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08252008-161944/en
dc.identifier.urihttp://hdl.handle.net/10919/39229en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1990.H963.pdfen
dc.relation.isformatofOCLC# 23459979en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1990.H963en
dc.subject.lcshBubblesen
dc.subject.lcshShip propulsionen
dc.subject.lcshWakes (Fluid dynamics)en
dc.titleThe simulation of surface ship micro-bubble wakesen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineAerospace Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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