Computation of Incompressible Viscous Flow around a Marine Propeller

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  • Computation of Incompressible Viscous F

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This paper describes an application of CFD (Computational Fluid Dynamics) to the computation of incompressible viscous flow around a marine propeller. High Reynolds-number flow around a marine propeller operating in a uniform flow is simulated using a newly developed CFD scheme, which is based on cell-centered, finite-volume method with global conservation property for mass and momentum flux.<BR>Governing equations are full Navier-Stokes equations and continuity equation with pseudo-compressibility, which are written in boundary-fitted curvilinear coordinate system fixed on a propeller blade. For discretization in space, 3rd-order upwind scheme derived from flux-difference splitting method is adopted for convection terms and 2nd-order central difference scheme for viscous terms, respectively. 1st-order Euler implicit scheme is adopted for the time integration and the resulted discretized equations are solved by Implicit Approximate Factorization (IAF) scheme with high efficiency.<BR>A series of high Reynolds-number flow computations around a SEIUNMARU conventional propeller are made to show validity and availability of the present scheme as a practical design tool. Through quantitative comparison of the computed results with experimental data for surface pressure distributions, thrust and torque coefficients, it is clearly shown that present scheme can predict a viscous flow around a marine propeller qualitatively well and that several problems, such as open boundary conditions and excessive grid skewness, should be solved in order to improve accuracy of the present scheme.<BR>By flow visualization technique using the computed results, some important characteristics of a rotating propeller flow such as the development of boundary layers and separation on a propeller blade, tip vortex generation and a structure of trailing vortices, are found to be well simulated qualitatively by the present scheme, which may be useful tool for the development of the inviscid-flow calculation method.

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