A Comprehensive Modelling Approach for the Neutral Atmospheric Boundary Layer: Consistent Inflow Conditions, Wall Function and Turbulence Model
A Comprehensive Modelling Approach for the Neutral Atmospheric Boundary Layer: Consistent Inflow Conditions, Wall Function and Turbulence Model
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DOI：
10.1007/s10546-011-9621-5
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发表时间：
2011-05
影响因子：
4.3
通讯作者：
A. Parente;C. Gorlé;J. Beeck;C. Benocci
中科院分区：
文献类型：
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作者：
A. Parente;C. Gorlé;J. Beeck;C. Benocci
本文报道了一种利用标准湍流模式对中性大气边界层(ABL)进行雷诺平均N-S(RANS)模拟的新方法。从模型输运方程的解出发，解析地导出了一个新的湍流动能入口条件，从而得到了一套一致的、完全发展的中性ABL入口条件。为了保证进口条件和湍流模型的一致性，还采用了对标准模型的修正。特别地，将湍流模型常数Cμ推广为位置相关参数，并在输运方程中引入了湍流耗散率的源项。通过实现一个算法，当湍流模型从ABL不受干扰的区域自动切换到直接受建筑物影响的区域时，可以将所提出的方法应用于流动中有障碍物的情况。最后，用对Richards和Hoxey粗糙壁边界条件稍作修改的形式完成了模型的建立。该方法在商业代码Ansys Fluent 12.1中得到了实现和测试。给出了平坦地形上中性边界层的结果，以及浸没在ABL中的单个建筑物周围的流动。
We report on a novel approach for the Reynolds-averaged Navier-Stokes (RANS) modelling of the neutral atmospheric boundary layer (ABL), using the standardturbulence model. A new inlet condition for turbulent kinetic energy is analytically derived from the solution of themodel transport equations, resulting in a consistent set of fully developed inlet conditions for the neutral ABL. A modification of the standardmodel is also employed to ensure consistency between the inlet conditions and the turbulence model. In particular, the turbulence model constantCμis generalized as a location-dependent parameter, and a source term is introduced in the transport equation for the turbulent dissipation rate. The application of the proposed methodology to cases involving obstacles in the flow is made possible through the implementation of an algorithm, which automatically switches the turbulence model formulation when going from the region where the ABL is undisturbed to the region directly affected by the building. Finally, the model is completed with a slightly modified version of the Richards and Hoxey rough-wall boundary condition. The methodology is implemented and tested in the commercial code Ansys Fluent 12.1. Results are presented for a neutral boundary layer over flat terrain and for the flow around a single building immersed in an ABL.