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arXiv 2005.00156physics.flu-dyn
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壳模型中间断turbulence的隐标度不变性

Hidden scale invariance of intermittent turbulence in a shell model

Alexei A. Mailybaev

摘要:

众所周知,尺度不变性在发展的流体动力学湍流中由于不稳定性而被打破,从而证实了湍流的复杂性。在这里,我们通过在间歇性湍流中建立隐藏的自相似性来挑战破缺尺度不变性的概念。使用一个简化的(壳)模型,我们推导出一个非线性时空尺度对称的无粘方程,这是重新制定的内在时间在不同尺度的运动。数值分析令人信服地证实,这种对称性恢复在统计意义上的惯性区间内。最后,我们讨论了这一结果对Navier-Stokes系统的影响。

英文摘要:

It is known that scale invariance is broken in the developed hydrodynamic turbulence due to intermittency, substantiating complexity of turbulent flows. Here we challenge the concept of broken scale invariance by establishing a hidden self-similarity in intermittent turbulence. Using a simplified (shell) model, we derive a nonlinear spatiotemporal scaling symmetry of inviscid equations, which are reformulated in terms of intrinsic times introduced at different scales of motion. Numerical analysis persuasively confirms that this symmetry is restored in a statistical sense within the inertial interval. At the end, we discuss implications of this result for the Navier-Stokes system.

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