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A zero-equation turbulence model for indoor airflow simulation

机译:用于室内气流模拟的零方程湍流模型

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At present, Computational-Fluid-Dynamics (CFD) with the 'standard' k-ε model is a popular method for numerical simulation of room airflow. The k-ε model needs a lot of computing time and large a computer. This paper proposes a new zero-equation model to simulate three- dimensional distributions of air velocity, temperature, and contaminant concentrations in rooms. The method assumes turbulent viscosity to be a function of length-scale and local mean velocity. The new model has been used to predict natural convection, forced convection, mixed convection, and displacement ventilation in a room. The results agree reasonably with experimental data and the results obtained by the standard k-ε model. The zero-equation model uses much less computer memory and the computing speed is at least 10 times faster, compared with the k-ε model. The grid size can often be reduced so that the computing time needed for a three-dimensional case can be a few minutes on a PC.
机译:目前,具有“标准”k-ε模型的计算流体动力学(CFD)是一种用于室内空气流动数值模拟的流行方法。 k-ε模型需要大量的计算时间,并且需要一台大型计算机。本文提出了一种新的零方程模型,以模拟室内空气速度,温度和污染物浓度的三维分布。该方法假设湍流粘度是长度尺度和局部平均速度的函数。新模型已用于预测房间内的自然对流,强制对流,混合对流和置换通风。结果与实验数据和通过标准k-ε模型获得的结果合理吻合。与k-ε模型相比,零方程模型使用的计算机内存少得多,计算速度至少快10倍。网格大小通常可以减小,以便在3D情况下所需的计算时间在PC上可以是几分钟。

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