Spatial optimal disturbances in swept attachment-line boundary layers
Spatial optimal disturbances in swept attachment-line boundary layers
复制标题
扫掠附着线边界层中的空间最优扰动
DOI：
10.1017/s0022112008001067
复制
发表时间：
2008
影响因子：
3.7
通讯作者：
P. Huerre
中科院分区：
文献类型：
--
作者：
Alan Guegan;P. Schmid;P. Huerre
基于直接和伴随抛物化方程，发展了一种计算后掠附着线边界层中扰动空间演化的公式。对于大于Re = 100的后掠角雷诺数，动力学主要由升力机制控制，该机制通过将展向涡转化为展向条纹而导致大的能量放大。这种机制有利于稳定的弦向尺度扰动，定量匹配其对应的经典Blasius边界层。
A formulation based on direct and adjoint parabolized equations is developed to account for the spatial evolution of perturbations in swept attachment-line boundary layers. For sweep Reynolds numbers larger than Re = 100 the dynamics is dominated by a lift-up mechanism which is responsible for large energy amplification by transforming spanwise vortices into spanwise streaks. This mechanism favours steady perturbations with a chordwise scale that quantitatively matches its counterpart for classical Blasius boundary layers.