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：

---

通过壁法向强迫的流向行波减少湍流阻力

我们回顾了湍流减阻的一些基本原理以及使用来自壁和壁变形的吹/吸的流向行波的湍流减阻技术。对于两种类型的流向行波控制，其显着的减阻能力已通过相对较低雷诺数下的直接数值模拟得到充分证实。这些流向行波的减阻机制被认为是由于泵送而产生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。对它们在更高雷诺数下的减阻能力的预测和实验验证的尝试也在紧锣密鼓地进行，以实现它们的实际实施。