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首页> 外文期刊>Applied Mathematical Modelling >Large eddy simulation of diffusion of a buoyancy source in ambient water
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Large eddy simulation of diffusion of a buoyancy source in ambient water

机译：浮力源在环境水中扩散的大涡模拟

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The movement of a lump of buoyancy in an ambient fluid is called a thermal. Previous experiments show that thermals display a significant degree of variability. This is because there is always an uncertainty of the discharge condition and also the fluid motion induced by thermals is turbulent. Each case of discharge can be considered as a single realization of the phenomenon. This paper presents numerical simulation of thermals in a water-tank. Emphasis is on the reproduction of the variability as well as the mean flow characteristics of the phenomenon. In the simulation, a three-dimensional large eddy simulation (LES) numerical model has been developed. In the model, the governing equations are split into three parts in the finite difference solution: advection, dispersion and pressure propagation. The advection part is solved by the QUICKEST scheme. The dispersion part is solved by the central difference method and the pressure propagation part is solved implicitly by using the Gauss-Seidel iteration method. It is found that the LES model can capture the transient characteristics of the turbulent flow. The uncertainty of the initial falling regime of the thermal observed in an experiment has been accounted for in the numerical simulation by introducing a random component to the initial conditions of the buoyancy source to trigger the generation of turbulence. The results of numerical simulation are in good agreement with the experiments. The results show that: (1) Thermal has an appearance of characteristic protuberances. (2) The rear of a thermal is hollow. (3) Variability exists among different realizations of a thermal.
机译：一团浮力在周围流体中的运动被称为热力。先前的实验表明，热量显示出很大的可变性。这是因为排出条件总是不确定的，并且由热引起的流体运动也是湍流的。每种放电情况都可以看作是现象的单一实现。本文提出了水箱内热力学的数值模拟。重点在于变异性的再现以及现象的平均流量特征。在仿真中，已经开发了三维大涡模拟（LES）数值模型。在该模型中，控制方程在有限差分法中分为三部分：对流，弥散和压力传播。对流部分由QUICKEST方案解决。分散部分通过中心差分法求解，压力传播部分通过高斯-塞德尔迭代法隐式求解。发现LES模型可以捕获湍流的瞬态特征。通过将随机分量引入浮力源的初始条件以触发湍流的产生，在数值模拟中考虑了在实验中观察到的热的初始下降状态的不确定性。数值模拟结果与实验吻合良好。结果表明：（1）热学具有特征性的凸起。 （2）散热片的后部是空心的。 （3）热量的不同实现之间存在差异。

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