从轴对称湍流到三维湍流的过渡

IF 1.5 4区工程技术 Q3 MECHANICS

Journal of Turbulence Pub Date : 2021-05-07 DOI:10.1080/14685248.2021.1918700

Zecong Qin, A. Naso, W. Bos

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引用次数: 0

摘要

在由线性强迫机制维持的纯轴对称湍流中，当强迫的环形分量低于阈值时，观察到稳定的、完全极向的流动。我们使用数值模拟研究了当流量的环形变化被连续重新引入并且强迫是纯极向的时，这种状态是否会持续。它显示了压力-应变相关性如何允许能量向环形组件重新分布。一个简单的统计模型可以捕捉全球能源平衡水平上的主要物理影响。然后，该模型用于研究不同环面-极向强迫强度和不同轴对称度下极向状态的稳定性。

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Transition from axisymmetric to three-dimensional turbulence

In purely axisymmetric turbulence sustained by a linear forcing mechanism, a stable, entirely poloidal flow is observed when the toroidal component of the forcing is below a threshold. We investigate using numerical simulations whether this state persists when toroidal variations of the flow are continuously reintroduced and the forcing is purely poloidal. It is shown how the pressure–strain correlation allows the redistribution of the energy towards the toroidal component. A simple statistical model allows to capture the main physical effects on the level of the global energy balance. This model is then used to investigate the stability of the poloidal state for various toroidal-to-poloidal forcing strengths and different degrees of axisymmetry.

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来源期刊

Journal of Turbulence 物理-力学

CiteScore

3.90

自引率

5.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Turbulence is a physical phenomenon occurring in most fluid flows, and is a major research topic at the cutting edge of science and technology. Journal of Turbulence ( JoT) is a digital forum for disseminating new theoretical, numerical and experimental knowledge aimed at understanding, predicting and controlling fluid turbulence. JoT provides a common venue for communicating advances of fundamental and applied character across the many disciplines in which turbulence plays a vital role. Examples include turbulence arising in engineering fluid dynamics (aerodynamics and hydrodynamics, particulate and multi-phase flows, acoustics, hydraulics, combustion, aeroelasticity, transitional flows, turbo-machinery, heat transfer), geophysical fluid dynamics (environmental flows, oceanography, meteorology), in physics (magnetohydrodynamics and fusion, astrophysics, cryogenic and quantum fluids), and mathematics (turbulence from PDE’s, model systems). The multimedia capabilities offered by this electronic journal (including free colour images and video movies), provide a unique opportunity for disseminating turbulence research in visually impressive ways.