Numerical Simulation of a Shear-Free Turbulent Boundary Layer

对平面流道中的湍流流动进行了直接的数值模拟，该流道的布置使得其中一个壁面(运动壁面)上的平均速度梯度消失。其目的是获得该壁面附近的详细湍流数据。然后利用这一点来研究壁面对湍流的两种影响的分离：运动学的(由于垂直起伏的抑制)和动态的(由于壁面引起的剪切)。在这种情况下，移动墙上的后一种影响被消除。将寻求将这种分离(分成两个单独的壁面效应)合并到简化的湍流闭合模型中以用于更复杂和真实的流动的方法。//

Direct numerical simulation is to be carried out for the turbulent flow in a planar channel which is so arranged that the average velocity gradient disappears on one of the walls (a moving wall). The purpose is to obtain detailed turbulence data near this wall. This is then to be utilized in a search for the separation of two effects of a wall on a turbulent flow: kinematic (due to the supression of perpendicular fluctuations), and dynamic (due to the shear induced by the wall). In this case, the latter effect is eliminated on the moving wall. Means will be sought for incorporating this separation (into two separate wall effects) into simplified turbulence closure models for more complex and realistic flows. //