Original scientific paper
NUMERICAL AND EXPERIMENTAL STUDY OF TURBULENT FREE SURFACE FLOW FOR A FAST SHIP MODEL
Yavuz Hakan Ozdemir
; Faculty of Naval Arch. and Maritime, Yildiz Tech. Univ, Istanbul, Turkey
Baris Barlas
orcid.org/0000-0002-5846-2369
; Faculty of Naval Arch. and Ocean Engin., Istanbul Tech. Univ., Istanbul, Turkey
Tamer Yilmaz
; Faculty of Naval Arch. and Maritime, Yildiz Tech. Univ, Istanbul, Turkey
Seyfettin Bayraktar
; Faculty of Naval Arch. and Maritime, Yildiz Tech. Univ, Istanbul, Turkey
Abstract
In this study the experimental and computational results for a fast ship model is presented. The Reynolds Averaged Navier Stokes (RANS) equations and the nonlinear free surface boundary conditions are discretized by means of an overset grid finite volume scheme. The experiments are performed at Istanbul Technical University Towing Tank basin. In the numerical turbulent flow calculations, the relationship between the Boussinesq's hypothesis of turbulence viscosity and the velocities are obtained through the standard k-ε turbulence model. Simulations of turbulent free surface flows around the model are performed by using Star CCM+ solver and Volume of Fluid (VOF) model to capture the free surface between air and water. The total resistance of the ship model is compared with the experimental results. Bow and aft wave form developments are also investigated qualitatively. For Froude (Fn) numbers less than 0.25, the computations are found to be well satisfactory, giving efficient and accurate tool to predict curves of resistance. For relatively higher speeds (Fn>0.25) a low Reynolds number turbulence model may be more suitable to predict the resistance.
Keywords
CFD; Turbulent free surface flows; Star CCM+; fast hull; k-ε turbulence model
Hrčak ID:
118040
URI
Publication date:
25.3.2014.
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