具有科里奥利效应的重力流湍流的直接模拟

IF 0.2 Q4 WATER RESOURCES RIBAGUA-Revista Iberoamericana del Agua Pub Date : 2014-01-01 DOI:10.1016/S2386-3781(15)30005-0
J.S. Salinas, M.I. Cantero, E.A. Dari
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引用次数: 6

摘要

重力流是由重力对不同密度流体的作用而产生的水平压力梯度所产生的流动。在自然界中,重力流具有很强的非线性特性,具有广泛的时空尺度。此外,由于科里奥利力的影响,地球的自转提高了重力流的复杂性。本研究通过直接数值模拟(DNS)解决了平面几何中的旋转重力流问题。模拟允许对流动发展、流动的宏观参数和湍流结构进行详细的分析。模拟使用伪谱代码进行,该代码在两个水平方向上使用傅里叶展开,在垂直方向上使用切比雪夫展开。这项工作详细记录了开发的代码和通过将模拟与实验观察和理论预测进行比较而进行的验证。这项工作还报告了两个不同转速的模拟。研究发现,流动旋转限制了电流在传播方向上的发展,并在前端位置引起振荡。这些振荡的频率随转速线性变化。最后,这项工作还报道了由系统旋转产生的电流前沿的开尔文-亥姆霍兹类湍流结构。
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Simulación directa de turbulencia en corrientes de gravedad con efecto Coriolis

Gravity currents are flows generated by horizontal pressure gradients resulting from the effect of gravity on fluids of different density. When they occur in nature, gravity currents have a strong nonlinear behavior and have a wide range of temporal and spatial scales. In addition, the rotation of the earth raises the level of complexity of gravity currents due to the effect of the Coriolis force. This work addresses rotating gravity currents in planar geometry by direct numerical simulation (DNS). The simulations allow for a detailed analysis of the flow development, macroscopic parameters of the flow and turbulence structure. Simulations were performed using a pseudospectral code that uses Fourier expansions in the two horizontal directions and Chebyshev expansions in the vertical direction. This work documents in detail the code developed and the validation performed by comparing a simulation with experimental observations and theoretical predictions. This work also reports on two simulations with different rotation speeds. It was found that the flow rotation restricts the development of the current in the propagating direction, and induces oscillations in the front position. The frequency of these oscillations varies linearly with the rotation speed. Finally, this work also reports on Kelvin-Helmholtz-like turbulent structures at the front of the current produced by the rotation of the system.

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