Exact coherent structures in fully developed two-dimensional turbulence
Exact coherent structures in fully developed two-dimensional turbulence
复制标题
充分发展的二维湍流中的精确相干结构
DOI:
10.1017/jfm.2023.584
复制
发表时间:
2023
影响因子:
3.7
通讯作者:
Grigoriev, Roman O.
中科院分区:
文献类型:
--
作者:
Zhigunov, Dmitriy;Grigoriev, Roman O.
This paper reports several new classes of unstable recurrent solutions of the two-dimensional Euler equation on a square domain with periodic boundary conditions. These solutions are in many ways analogous to recurrent solutions of the Navier–Stokes equation which are often referred to as exact coherent structures. In particular, we find that recurrent solutions of the Euler equation are dynamically relevant: they faithfully reproduce large-scale flows in simulations of turbulence at very high Reynolds numbers. On the other hand, these solutions have a number of properties which distinguish them from their Navier–Stokes counterparts. First of all, recurrent solutions of the Euler equation come in infinite-dimensional continuous families. Second, solutions of different types are connected, e.g. an equilibrium can be smoothly continued to a travelling wave or a time-periodic state. Third, and most important, they are only weakly unstable and, as a result, fully developed turbulence mimics some of these solutions remarkably frequently and over unexpectedly long temporal intervals.
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DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
D. Crowdy
通讯作者:
D. Crowdy
影响因子:
1.7
作者:
Eckhardt, Bruno;Zammert, Stefan
通讯作者:
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影响因子:
3.7
作者:
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通讯作者:
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影响因子:
2.9
作者:
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通讯作者:
Eckhardt, Bruno
影响因子:
3.7
作者:
Lucas D
通讯作者:
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