摘要
采用物理分步法对线性波中二维射流进行了大涡模拟(LES).物理分步法将N-S方程剖分为对流、扩散及波动过程,对不同的物理过程分别采用适宜的方法进行求解.对流过程采用逆风-中心差分格式求解;扩散过程采用中心差分格式求解;压力方程采用SOR迭代法求解.LES模型模拟出了射流的成长过程及表面波的影响过程.表面波的影响使得射流轴线扭曲摆动,加强了射流与周围水体的动量交换.表明了LES理论对紊流细部结构具有独特的数值模拟能力,可望用以解决大量的工程实际问题.
Two-dimensional jets in linear waves were simulated by large eddy with the help of physical fractional-step method. The basic idea of this method is that according to the behavior of each differential operator, the water governing equations can be divided into three parts. The first is a convective problem, and solved by the central-upwind deference scheme; the second is a diffusive problem, and solved by the central deference scheme; and the third is a source term （pressure equation）, and solved by the SOR iteration method. The development processes of jets and of the interaction between jets and linear waves were simulated by large-eddy simulation （LES）. The interaction between jets and linear waves make the jets swing; and make the momentum exchange strongly between the jets and the water around the jets. The research shows that the LES theory has powerful capacity in the simulation of microstructures of turbulent flows, and can be widely applied to the solution of real engineering problems.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第9期45-47,共3页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(50479038)
