舶用プロペラまわり流場計算へのCFDの応用 : 計算格子生成及びオイラー方程式を用いた非粘性計算

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This paper shows an application of CFD (Computational Fluid Dynamics) to the flow computation around a marine propeller, i.e. grid generation and inviscid flow computation. New grid generation system around a marine propeller is developed using Implicit Geometrical Method. This system consists of two parts, i.e. surface grid and three-dimensional grid generation and is possible to generate a grid system around a marine propeller with practical configuration. A series of inviscid flow computations are made using Euler equations and continuity equation with pseudo-compressibility. Finite-Volume, cell-centered, 3rd order upwind, and Implicit Approximate Factorization (IAF) scheme is adopted in order to simulate a flow around a propeller at the open test condition with high accuracy and efficiency. Computations are made modifying propeller pitch ratio larger (P=10,5,2) than original value (P=0.95). Computed results are compared with those by Lifing Surface Method, and good agreement is shown for chordwise load distribution, thrust and torque coefficient (K_T and K_Q). It is also shown that grid skewness may deteriorate accuracy of the computed results, especially of pressure distribution near the leading edge, when pitch ratio small (P=2). "Multi-block" type grid system, which is possible to keep grid skewness small at small pitch ratio, is thought to be one of the probable method for successful simulation around a marine propeller with practical configuration.
社団法人日本船舶海洋工学会の論文
1992-09-25

舶用プロペラまわり流場計算へのCFDの応用 : 計算格子生成及びオイラー方程式を用いた非粘性計算

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