Physical implication of two problems in transition prediction of boundary layers based on linear stability theory

Physical implication of two problems in transition prediction of boundary layers based on linear stability theory
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基于线性稳定性理论的边界层转变预测中两个问题的物理意义

DOI:
10.1007/s11433-014-5428-y
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发表时间:
2014-03
期刊:
Science China Physics,Mechanics & Astronomy
影响因子:
--
通讯作者:
Su CaiHong
Su CaiHong
中科院分区:
其他
文献类型:
--
作者:
Su CaiHong

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到目前为止,应用最广泛的过渡预测方法是基于线性稳定性理论的预测方法。当它应用于三维边界层时,必须选择扰动增长率积分的方向或路径。复变函数论中用鞍点方法给出的方向在数学上是最合理的。然而,与应用于水波的鞍点法不同,它的物理意义并不是那么明显,因为频率和波数可能是复杂的。而在某些情况下,在推进扰动增长率的积分时,直到某一位置,可能无法继续积分,因为鞍点法确定方向的条件不能再基于连续变化的波数来满足。本文对这两个问题进行了讨论,并对如何在后一种情况下进行过渡预测提出了建议。
Up to now, the most widely used method for transition prediction is the one based on linear stability theory. When it is applied to three-dimensional boundary layers, one has to choose the direction, or path, along which the growth rate of the disturbance is to be integrated. The direction given by using saddle point method in the theory of complex variable function is seen as mathematically most reasonable. However, unlike the saddle point method applied to water waves, here its physical meaning is not so obvious, as the frequency and wave number may be complex. And on some occasions, in advancing the integration of the growth rate of the disturbance, up to a certain location, one may not be able to continue the integration, because the condition for specifying the direction set by the saddle point method can no longer be satisfied on the basis of continuously varying wave number. In this paper, these two problems are discussed, and suggestions for how to do transition prediction under the latter condition are provided.
DOI: 10.1007/s11433-009-0162-6
发表时间: 2009-07
期刊: Science in China Series G: Physics, Mechanics and Astronomy
影响因子: --
作者:
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通讯作者: Caihong Su;Heng Zhou
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期刊: Science in China Series G: Physics, Mechanics and Astronomy
影响因子: --
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