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首页> 外文期刊>International Journal of Heat and Fluid Flow >Large eddy simulation of turbulent flows in a rotating concentric annular channel
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Large eddy simulation of turbulent flows in a rotating concentric annular channel

机译：旋转同心环形通道内湍流的大涡模拟

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摘要

Turbulent flow through a concentric annular channel rotating around its axis is investigated numerically by use of large eddy simulation (LES) coupled with a localized one-equation dynamic subgrid-scale (SGS) model (LDM). The objective of this study is to investigate the behavior of turbulent flow near the inner and outer walls of the rotating concentric annular channel and to examine the effectiveness of the LES technique for predicting the turbulent flow subjected to system rotation. The Reynolds number, based on the global friction velocity u_τ and the annular channel gap width d, is 640, and the rotation number N = 0-20, which is defined as N = 2Ωd/u_τ with Ω being the angular velocity of the rotating annular channel. To validate the present computation, LES on turbulent flows in a rotating pipe and in a concentric annular channel are carried out, which shows that the LES results are in good agreement with available experimental data and direct numerical simulation (DNS) results. Then, turbulent statistics in the rotating annular channel, including the resolved velocity, turbulence intensities, Reynolds stresses, turbulence skewness and flatness, and flow structures near the walls, are investigated. The budgets of turbulent kinetic energy and Reynolds stresses are calculated to examine the turbulence production rate, velocity and pressure-gradient correlation, turbulence diffusion, dissipation rate and Coriolis force term near the outer and inner walls.
机译：通过使用大涡模拟（LES）结合局部一方程动态亚网格规模（SGS）模型（LDM），对通过绕其轴旋转的同心环形通道的湍流进行了数值研究。这项研究的目的是研究旋转同心环形通道内壁和外壁附近的湍流行为，并检验LES技术预测受系统旋转的湍流的有效性。基于整体摩擦速度u_τ和环形通道间隙宽度d的雷诺数为640，转数N = 0-20，定义为N =2Ωd/u_τ，其中Ω为旋转的角速度环形通道。为了验证当前的计算，对旋转管和同心环形通道中的湍流进行了LES，这表明LES结果与可用的实验数据和直接数值模拟（DNS）结果非常吻合。然后，研究了旋转环形通道中的湍流统计数据，包括解析速度，湍流强度，雷诺应力，湍流偏度和平面度以及壁附近的流动结构。计算湍流动能和雷诺应力的预算，以检查湍流产生速率，速度和压力梯度的相关性，湍流扩散，耗散率和内外壁附近的科里奥利力项。

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