摘要
在湍流模型方程的模型化过程中,引入了有一定取值范围的模型常(系)数。这些模型常(系)数的推荐值是否适用于船舶阻力的数值计算还有待确认。文中选取常见的标准k-ε和k-ω二方程湍流模型作为研究对象,变动湍流模型中的常(系)数并用于Wigley船型和数学三体船型的阻力计算。从文中的数值计算可以看出:分别修正标准k-ε模型中的5个系数均不影响船体压阻力分量;除模型系数σk外,其他4个模型系数的修正对船体摩擦阻力有不同程度的影响。修正k-ω模型中的3个模型系数对压阻力分量无影响;对摩擦阻力分量有不同程度的影响。研究表明采纳这两种湍流模型用于船体阻力性能研究时船体摩擦阻力分量的计算值受模型常(系)数变动的影响不能忽略,而船体压阻力的计算结果对模型常(系)数不敏感,各模型常(系)数的推荐值对船体压阻力的计算具有鲁棒特性。文中研究有助于明确湍流模型常(系)数在船舶阻力性能研究中的适用性,而且有助于理解数值计算中湍流模型导致的误差和不确定因素。
In the process of modeling of turbulence models,some model constants and coefficients were introduced.The suitability of these model constants and coefficients should be confirmed before they are adopted in the calculation of ship hull resistance.In this paper,the standard k-and k-two-equation turbulence models were chosen to investigate the effects of modification of turbulence model constants and coefficients on the resistance calculation of Wigley hull and a mathematical trimaran hull.It was shown that modification of five model coefficients of standard k-model had no effect on the component of pressure resistance,and had a little effect on the component of frictional resistance except the model coefficient of.The modification of three model coefficients of k-model had no effect on the component of pressure resistance,and had a little effect on the component of frictional resistance.The results showed that the calculation results of hull friction resistance were affected by the values of model constants and coefficients,and the pressure resistance was not sensitive to model constants and coefficients when these two turbulence models were adopted.The conclusion in this paper is helpful in confirming the suitability of model constants and coefficients in the study of ship resistance performance and analyzing errors and uncertainties caused by turbulence models.
出处
《船舶力学》
EI
北大核心
2011年第11期1217-1223,共7页
Journal of Ship Mechanics
关键词
船舶CFD
阻力计算
二方程湍流模型
湍流模型常(系)数
ship CFD
resistance calculation
two-equation turbulence model
turbulence model constants and coefficients
