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arXiv 1807.03561physics.flu-dynnlin.CD
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时间周期加速度对Rayleigh-Taylor turbulence的抑制

Suppression of Rayleigh-Taylor turbulence by time-periodic acceleration

G. Boffetta, M. Magnani, S. Musacchio

摘要:

通过对Boussinesq方程的直接数值模拟,研究了存在交替时间周期性加速度时Rayleigh-Taylor湍流对流的动力学。在这个框架内,我们发现了一个新的机制的再层化的湍流:交替加速,最初产生一个不断增长的湍流混合层,在较长的时间抑制湍流波动和驱动系统向渐近稳定的配置。量纲参数和线性稳定性理论被用来预测的混合层的宽度在渐近状态作为一个函数的周期的加速度。我们的研究结果提供了一个简单的控制和抑制湍流对流的例子,在不同的领域具有潜在的应用。

英文摘要:

The dynamics of Rayleigh-Taylor turbulence convection in presence of an alternating, time periodic acceleration is studied by means of extensive direct numerical simulations of the Boussinesq equations. Within this framework, we discover a new mechanism of relaminarization of turbulence: The alternating acceleration, which initially produces a growing turbulent mixing layer, at longer times suppresses turbulent fluctuation and drives the system toward an asymptotic stationary configuration. Dimensional arguments and linear stability theory are used to predict the width of the mixing layer in the asymptotic state as a function of the period of the acceleration. Our results provide an example of simple control and suppression of turbulent convection with potential applications in different fields.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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