密度线性分层环境下垂直贴壁异重流数值模拟

摘要

通过求解雷诺时均N-S方程，应用考虑密度的物质输运模型模拟计算了密度分层环境下的垂向二维贴壁射流过程，采用数值模拟方法对异重流的演进过程、头部运动速度进行了研究，并根据计算结果分析了异重流的演进特征以及浮力系数对运动特征值的影响。模拟结果表明数值计算结果与试验结果吻合，说明该数值模型可以比较准确地模拟分层流体环境下异重流的演进过程。%This paper presented the results from a numerical simulation to investigate the vertical near wall density current issued into a density stratified environment. A tracer transport model considering density variation induced by tracer concentrations was developed. Details of tracer transport model together with boundary and initial conditions and solution methods were described. The evolution of the issued density current profile was simulated for various buoyancy numbers. Good agreement between the simulated and measured results was obtained,which indicates that the mathematical model can be successfully applied to investigate the turbulent mixing of density current with ambient stratified fluid.