Investigation of two-dimensional transom waves using inviscid and viscous free-surface boundary conditions at model- and full-scale ship Reynolds numbers

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorSchweighofer, Juha 
dc.contributor.departmentDepartment of Mechanical Engineeringen
dc.contributor.departmentKonetekniikan osastofi
dc.contributor.labShip Laboratoryen
dc.contributor.labLaivalaboratoriofi
dc.contributor.supervisorMatusiak, Jerzy
dc.date.accessioned2012-02-10T08:51:45Z
dc.date.available2012-02-10T08:51:45Z
dc.date.issued2003-08-15 
dc.description.abstractTwo-dimensional transom waves are computed using inviscid and viscous free-surface boundary conditions at model- and full-scale ship Reynolds numbers. The computations are carried out solving the steady Euler or RaNS equations with the Navier-Stokes solver, FINFLO. The viscous free-surface boundary conditions are obtained from a flat-surface approximation. Different numerical schemes used when evaluating the free-surface deformation are presented. Their effect on the evaluated transom waves and the flow field is discussed at model and full scale. Further, computations of turbulent free-surface flows carried out at full-scale ship Reynolds numbers using the moving-grid technique and no wall functions are presented and discussed. An improved extrapolation method combining model testing and CFD is proposed. The simulations in this work demonstrate the significant effect of the numerical realization of the free-surface boundary conditions and the decreasing Froude number on the computed transom waves, the flow field and the total resistance. At full-scale ship Reynolds numbers, multigridding will speed up the convergence. The free-stream dissipation of the turbulent kinetic energy has to be treated like a material property when using Chien's low-Reynolds number k-ε turbulence model. The scaling of the computed results is in excellent agreement with the modified ITTC-78 method. The convected turbulent kinetic energy is amplified by the transom waves. At the vicinity of the transom, a significant increase of the nondimensional vorticity is obtained at full scale.en
dc.description.versionrevieweden
dc.format.extent136 
dc.format.mimetypeapplication/pdf 
dc.identifier.isbn951-22-6648-2 
dc.identifier.issn1456-3045 
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/2098
dc.identifier.urnurn:nbn:fi:tkk-000662 
dc.language.isoenen
dc.publisherHelsinki University of Technologyen
dc.publisherTeknillinen korkeakoulufi
dc.relation.ispartofseriesHelsinki University of Technology, Ship Laboratory. Men
dc.relation.ispartofseriesTeknillinen korkeakoulu, laivalaboratorio. Mfi
dc.relation.ispartofseries281en
dc.subject.keywordFINFLOen
dc.subject.keywordtransom wavesen
dc.subject.keywordfree-surface boundary conditionsen
dc.subject.keywordReynolds-averaged Navier-Stokes equationsen
dc.subject.keywordEuler equationsen
dc.subject.keywordfull scaleen
dc.subject.keywordscalingen
dc.subject.otherMechanical engineeringen
dc.titleInvestigation of two-dimensional transom waves using inviscid and viscous free-surface boundary conditions at model- and full-scale ship Reynolds numbersen
dc.typeG4 Monografiaväitöskirjafi
dc.type.dcmitypetexten
dc.type.ontasotVäitöskirja (monografia)fi
dc.type.ontasotDoctoral dissertation (monograph)en
local.aalto.acrisexportstatuschecked 2022-09-02_1331
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local.aalto.digifolderAalto_87733
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