This paper proposes a method of testing the free volume models for fluid transport properties by the MD simulation data for square well fluids. Several commouly used free volume models for viscosity and thermal conduc...This paper proposes a method of testing the free volume models for fluid transport properties by the MD simulation data for square well fluids. Several commouly used free volume models for viscosity and thermal conductivity are evaluated by the method,and the results show that the model proposed by this author is superior to others. Two important conclusions have been derived: a unified model can be applied to both viscosity and thermal conductivity, and the transport properties of liquld and gas (vapor) phases can be correlated simultaniously by the model with whfied parameters. The conclusions approached here are of significance to the systems of practical interests.展开更多
为了对溢流堰的流场进行数值模拟,从完整的N-S方程出发,采用k-ε两方程湍流模型封闭R eyno lds方程,作为基本控制方程,对自由表面的追踪采用了VOF(vo lum e of flu id)方法。数值计算中,对基本控制方程采用了基于交错网格的SIM PLE算法...为了对溢流堰的流场进行数值模拟,从完整的N-S方程出发,采用k-ε两方程湍流模型封闭R eyno lds方程,作为基本控制方程,对自由表面的追踪采用了VOF(vo lum e of flu id)方法。数值计算中,对基本控制方程采用了基于交错网格的SIM PLE算法,对自由表面控制方程采用了施主—受主方法。计算了溢流堰上的流速和压力分布,并与已有的试验结果作了比较。结果表明,计算方法能够比较准确地模拟溢流堰的流场。展开更多
文摘This paper proposes a method of testing the free volume models for fluid transport properties by the MD simulation data for square well fluids. Several commouly used free volume models for viscosity and thermal conductivity are evaluated by the method,and the results show that the model proposed by this author is superior to others. Two important conclusions have been derived: a unified model can be applied to both viscosity and thermal conductivity, and the transport properties of liquld and gas (vapor) phases can be correlated simultaniously by the model with whfied parameters. The conclusions approached here are of significance to the systems of practical interests.
文摘为了对溢流堰的流场进行数值模拟,从完整的N-S方程出发,采用k-ε两方程湍流模型封闭R eyno lds方程,作为基本控制方程,对自由表面的追踪采用了VOF(vo lum e of flu id)方法。数值计算中,对基本控制方程采用了基于交错网格的SIM PLE算法,对自由表面控制方程采用了施主—受主方法。计算了溢流堰上的流速和压力分布,并与已有的试验结果作了比较。结果表明,计算方法能够比较准确地模拟溢流堰的流场。
