论文标题
部分可观测时空混沌系统的无模型预测
Direct transition to elastoinertial turbulence from a linear instability in channel flow
论文作者
论文摘要
几十年来，据信粘弹性平行剪切流的湍流过渡需要非线性不稳定性。我们为新的壁模式线性不稳定性提供了数值证据，该线性不稳定性直接触发了通道流中的弹性湍流的过渡。不稳定性为2D，但随着非线性效应的增长，3D特征变得重要。在较大的干扰下，观察到直接过渡到非线性不稳定性，导致惯性和弹性性质的湍流状态。
For decades, transition to turbulence in viscoelastic parallel shear flows was believed to require nonlinear instabilities. We provide numerical evidences for a new wall-mode linear instability that directly triggers the transition to elastoinertial turbulence in channel flow. The instability is 2D but 3D features become important as nonlinear effects grow. With larger disturbances, direct transition to nonlinear instabilities, leading to turbulent states of both inertial and elastoinertial natures, are observed.
