We review some fundamentals of turbulent drag reduction and the turbulent drag reduction techniques using streamwise traveling waves of blowing/suction from the wall and wall deformation. For both types of streamwise traveling wave controls, their significant drag reduction capabilities have been well confirmed by direct numerical simulation at relatively low Reynolds numbers. The drag reduction mechanisms by these streamwise traveling waves are considered to be the combination of direct effects due to pumping and indirect effects of the attenuation of velocity fluctuations due to reduced receptivity. Prediction of their drag reduction capabilities at higher Reynolds numbers and attempts at experimental validation are also intensively ongoing toward their practical implementation.

中文翻译：

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通过壁法向强迫的流向行波减少湍流阻力


我们回顾了减少湍流阻力的一些基本原理，以及使用来自壁和壁变形的流向行进波的湍流阻力减少技术。对于这两种类型的流向行波控制，它们在相对较低的雷诺数下的直接数值模拟中都已充分证实了它们显著的减阻能力。这些流向行波的减阻机制被认为是由于泵浦引起的直接效应和由于接受性降低而导致的速度波动衰减的间接效应的组合。在更高的雷诺数下预测它们的减阻能力并尝试进行实验验证，也正在紧锣密鼓地进行，以实现其实际实施。