Transient growth of stationary disturbances in a flat plate boundary layer
Transient growth of stationary disturbances in a flat plate boundary layer
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DOI：
10.1063/1.1521124
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发表时间：
2002-11
影响因子：
4.6
通讯作者：
E. White
中科院分区：
文献类型：
--
作者：
E. White
边界层瞬态代数生长的理论和直接数值模拟模型在没有充分的平行实验努力的情况下取得了重大进展。以高水平的自由流湍流或分布表面粗糙度激发的扰动为特征的实验显示出与最优扰动理论一致的行为，但不能解决理论的关键预测，即在特定的展向波数下扰动的增长和衰减。本实验旨在为平板边界层提供这样的数据，使用展向粗糙度阵列来激发受控的平稳扰动。结果表明，虽然最优扰动理论正确地捕捉了总体趋势和定性行为，但理论预测与目前的实验测量之间存在显著的定量差异。差异包括墙-法向扰动剖面的最大值位置和最大值的流向位置。
Theoretical and direct numerical simulation models of transient algebraic growth in boundary layers have advanced significantly without an adequate, parallel experimental effort. Experiments that feature disturbances excited by high levels of freestream turbulence or distributed surface roughness show behavior consistent with optimal-disturbance theories but cannot address the theories’ key predictions concerning the growth and decay of disturbances at specific spanwise wavenumbers. The present experiment seeks to provide such data for a flat plate boundary layer using a spanwise roughness array to excite controlled stationary disturbances. The results show that although general trends and qualitative behaviors are correctly captured by optimal-disturbance theories, significant quantitative differences exist between the theories’ predictions and the current experimental measurements. Discrepancies include the location of the wall-normal disturbance profiles’ maxima and the streamwise location of the maxim...