论文标题
墙壁湍流的条纹不必长时间
The streaks of wall-bounded turbulence need not be long
论文作者
论文摘要
使用数值实验探索了阻尼壁结合的湍流中最长条纹的影响。发现不需要长条纹即可自我维持爆裂过程，这相对较小的缺席影响。特别是，存在湍流状态，即流向速度的波动的长度大致与爆发的长度大致相同，因此可能与爆发本身相关，而爆发结构与较长速度波动的流动基本上没有区别。这表明在未修饰的流中发现的长条纹可能是副产品，而不是能量产生周期的活跃部分。
The effect of damping the longest streaks in wall-bounded turbulence is explored using numerical experiments. It is found that long streaks are not required for the self-sustenance of the bursting process, which is relatively little affected by their absence. In particular, there are turbulence states in which the fluctuations of the streamwise velocity have approximately the same length as the bursts, and are thus presumably associated with the bursts themselves, while the burst structure is essentially indistinguishable from flows in which longer velocity fluctuations are present. This suggests that the long streaks found in unmodified flows may be byproducts, rather than active parts of the energy generation cycle.
