Triad interactions in a forced turbulence

Triad interactions in a forced turbulence
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强迫湍流中的三元相互作用

DOI:
10.1063/1.858296
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发表时间:
1992
期刊:
影响因子:
4.6
通讯作者:
S. Kida
S. Kida
中科院分区:
工程技术2区
文献类型:
--
作者:
K. Ohkitani;S. Kida

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通过对高雷诺数(Rλ <$180)下不可压各向同性湍流的直接数值模拟数据的分析,研究了形成三角形的三种波数傅立叶模式之间的相互作用。根据能量转移到每个傅立叶模式的方向,三元相互作用分为六种类型:(+,+,−),(+,−,+),(+,−,−),(−,+,+),(−,+,−),(−,−,+),其中+(或−)表示最大、中间和最小波数的模式的能量增益(或损失)。最后三种类型的相互作用非常少。在第一种类型的相互作用中,相当数量的能量通常在波数大小相当的三种模式之间交换。在第二类和第三类中,较大的两个波数的大小相当,并且比最小的波数大得多,并且在前两者之间交换了大量的能量。三元相互作用的这种行为非常符合…
An analysis of the data of a direct numerical simulation of a forced incompressible isotropic turbulence at a high Reynolds number (Rλ≊180) is made to investigate the interaction among three Fourier modes of wave numbers that form a triangle. The triad interaction is classified into six types according to the direction of the energy transfer to each Fourier mode: (+,+,−), (+,−,+), (+,−,−), (−,+,+), (−,+,−), (−,−,+), where the + (or −) denotes the energy gain (or loss) of the modes of the largest, the intermediate, and the smallest wave numbers in this order. The last three types of the interaction are very few. In the first type of the interaction, a comparable amount of energy is exchanged typically among three modes of comparable magnitude of wave numbers. In the second and third types, the magnitudes of the larger two wave numbers are comparable and much larger than the smallest one, and a great amount of energy is exchanged between the former two. This behavior of the triad interaction agrees very wel...
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