Optimal disturbances in swept Hiemenz flow
Optimal disturbances in swept Hiemenz flow
复制标题
扫频希门茨流的最佳扰动
DOI：
10.1017/s0022112007005162
复制
发表时间：
2007
影响因子：
3.7
通讯作者：
P. Schmid
中科院分区：
文献类型：
--
作者：
Alan Guegan;P. Huerre;P. Schmid
具有最大瞬态能量增长的初始扰动是在扫掠前缘边界层的背景下计算的。尽管在较短的时间尺度上，放大最大的扰动具有有限的展向波数，但在展向 z 方向上均匀的扰动发现了最高的能量放大。在这两种情况下，与展向速度的剪切相关的产生项负责扰动能量方程中的能量放大。与条纹边界层中最佳扰动所表现出的放大机制建立联系（Hoepffner 等人，J. Fluid Mech. vol. 537, 2005, p.91），并将结果与 Guégan 等人计算的最佳 Görtler-Hämmerlin 扰动进行比较。 （《流体力学杂志》，第 566 卷，2006 年，第 11 页）。
The initial perturbation with the largest transient energy growth is computed in the context of the swept leading-edge boundary layer. The highest energy amplification is found for perturbations which are homogeneous in the spanwise z-direction, although on shorter time scales the most amplified disturbances have a finite spanwise wavenumber. In both cases the production term associated with the shear of the spanwise velocity is responsible for the energy amplification in the perturbation energy equation. A connection is made with the amplification mechanism exhibited by optimal perturbations in streaky boundary layers (Hoepffner et al. J. Fluid Mech. vol. 537, 2005, p.91) and the results are compared to the optimal Görtler–Hämmerlin disturbances computed by Guégan et al. (J. Fluid Mech. vol. 566, 2006, p. 11).