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.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Schweighofer, Juha
dc.date.accessioned 2012-02-10T08:51:45Z
dc.date.available 2012-02-10T08:51:45Z
dc.date.issued 2003-08-15
dc.identifier.isbn 951-22-6648-2
dc.identifier.issn 1456-3045
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2098
dc.description.abstract Two-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.format.extent 136
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Helsinki University of Technology, Ship Laboratory. M en
dc.relation.ispartofseries Teknillinen korkeakoulu, laivalaboratorio. M fi
dc.relation.ispartofseries 281 en
dc.subject.other Mechanical engineering en
dc.title Investigation of two-dimensional transom waves using inviscid and viscous free-surface boundary conditions at model- and full-scale ship Reynolds numbers en
dc.type G4 Monografiaväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Mechanical Engineering en
dc.contributor.department Konetekniikan osasto fi
dc.subject.keyword FINFLO en
dc.subject.keyword transom waves en
dc.subject.keyword free-surface boundary conditions en
dc.subject.keyword Reynolds-averaged Navier-Stokes equations en
dc.subject.keyword Euler equations en
dc.subject.keyword full scale en
dc.subject.keyword scaling en
dc.identifier.urn urn:nbn:fi:tkk-000662
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (monografia) fi
dc.type.ontasot Doctoral dissertation (monograph) en
dc.contributor.lab Ship Laboratory en
dc.contributor.lab Laivalaboratorio fi


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