An Improvement Method of Zero-equation Turbulence Model Considering Characteristics of Algebraic Stress Model

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  • 代数応力方程式モデルの性質を考慮した0方程式乱流モデルの改良に関する研究
  • ダイスウ オウリョク ホウテイシキ モデル ノ セイシツ オ コウリョ シタ 0 ホウテイシキ ランリュウ モデル ノ カイリョウ ニ カンスル ケンキュウ

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An improvement method of zero-equation turbulence model was proposed. The improvement was carried out being approximated κ and ε used in the eddy viscosity expression of Shih-Lumley model to the characteristics of time-averaged velocity field like free stream velocity or displacement thickness. The method suggested a way to reduce higher-order turbulence model like an ASM(Algebraic Stress Model)to zero-equation turbulence model. CFD computations were carried out using this improved model. The model could simulate longitudinal vortices in hull ship stern flow, but the approximate method of turbulent length scale and turbulent velocity scale needed being modified.

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