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A Study on Grid Dependencies of the Numerical Solutions for Ship Viscous Flows
강국진,이승희,Kang, K.J.,Lee, S.H. The Society of Naval Architects of Korea 1994 大韓造船學會 論文集 Vol.31 No.4
It is very important to understand characteristics of solution due to the variation of computational grid sizes, especially when turbulence model not incorporating wall-function is used. The present paper performs numerical investigation on the grid dependency of numerical solution for three dimensional turbulent flow field around a ship. In the present study a finite volume method with a modified sub-grid scale turbulence model and a numerically constructed non-orthogonal curvilinear coordinate system capable of conforming complex ship geometries are used. Numerical studies are then performed for a mathematical Wigley hull and the Series 60, $C_B=0.8$ hull forms. The results for various grid sizes are compared with each other and with measured data to show grid dependencies of numerical solutions.
강국진(K. J. Kang) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
Computational methods can be classified roughly into two parts: one is the methods based on a potential flow theory, and the other is numerical solvers(CFD) based on Navier-Stockes equation. Methods based on a potential theory are more effective than CFD when the free surface effect is considered. Especially Rankine source method seems to become widespread for simulations of wave making problems. For computations of viscous flow problems, CFD techniques have rapidly been developed and have shown many successful results in the viscous flow calculation. Present paper introduces a computational system WAVIS which includes a pre-processor, potential and viscous flow solvers and a post-processor. To validate the system, the calculated results for modern commercial hull forms are compared with measurements. It is found that the results from the system are in good agreement with the experimental data, illustrating the accuracy of the numerical methods employed for WAVIS.