论文标题
局部波数据包的传播机制
Propagation mechanism of localized wave packet in plane-Poiseuille flow
论文作者
论文摘要
发现平面 - 脉流流中局部波数据包的对流速度被发现是由下游涡流偶极子在其平均场的中心线上的孤立波确定的。涡旋偶极子之后的波动成分以上游边际绝对不稳定性选择的全局频率振荡，并传播遵守平均流量的局部分散关系。通过应用局部初始干扰，在阈值状态下实现了非零的波包密度，这表明一阶转变。
The convection velocity of localized wave packet in plane-Poiseuille flow is found to be determined by a solitary wave at the centerline of a downstream vortex dipole in its mean field after deducting the basic flow. The fluctuation component following the vortex dipole oscillates with a global frequency selected by the upstream marginal absolute instability, and propagates obeying the local dispersion relation of the mean flow. By applying localized initial disturbances, a nonzero wave-packet density is achieved at the threshold state, suggesting a first order transition.
