Large Eddy Simulation for Turbulent Flow of non-Newtonian Fluid

为了发展适用于表面活性剂溶液等非牛顿流体的大涡模拟方法，对槽道湍流进行了直接数值模拟，研究了非牛顿流体的壁面湍流特性。结果发现，从瞬时结构和湍流统计的角度进行尺度分析，非牛顿流体的湍流结构与牛顿流体的情况一样，一般可以用局部变粘度进行归一化。提出了一种适用于大涡模拟的修正模型，并验证了该模型在表面活性剂溶液湍流模拟中的可靠性。

To develop a large-eddy simulation(LES) method for non-Newtonian fluid such as surfactant solution, we performed direct numerical simulations(DNS) of turbulent channel flow and investigated features of wall turbulence of non-Newtonian fluid. As a result, we found, due to a scale analysis from a viewpoint of instantaneous structures and turbulence statistics, that the turbulent structures of non-Newtonian fluid could be generally normalized with the local variable viscosity as well as the case of Newtonian fluid. We suggested a modified model for LES and validated the reliability for turbulent flow of surfactant solution.