A Comparative Study of Zero- and One-Equation Turbulence Models for Ship Flows

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  • A Commparative Study of Zero- and One-Equation Turbulence Models for Ship Flows

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A primary objective of the present work is to compare and evaluate the performance of several improved one-equation eddy viscosity models which are simple and available for the promising unstructured grid method. Two types of ship flows were tested on the basis of Reynolds averaged Navier-Stokes equations coupled with four turbulence models: 1)the original Spalart and Allmaras(SA)one equation model, 2)the SA model with Spalart and Shur correction to account for the system rotation and/or streamline curvature effects, 3)the SA model with the cross flow modification proposed by SR222 project, and4)the SA model with the axial vortex correction suggested by Spalart. The flows investigated were unbounded turbulent flows around an SR196A tanker ship and a Ryukou-maru tanker ship, respectively. The numerical results were compared with the measured data and computations using two of algebraic zero-equation eddy viscosity models, and the capabilities and limitations of the models to viscous flows around a ship hull, especially turbulent wakes, are discussed.

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