Research on an improved inflow turbulence generation approach for large eddy simulation

被引：0
|
作者：
Yang Y. [1 ]
Ji C.-H. [1 ]
Zhang Z.-Y. [1 ]
Hu X.-B. [1 ,2 ]
机构：
[1] State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou
[2] School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan
来源：
Gongcheng Lixue/Engineering Mechanics | 2021年 / 38卷 / 12期
关键词：
Coherence function; Equilibrium atmospheric boundary layer; Inflow boundary condition; Large eddy simulation; Turbulence synthesis technique;
D O I：
10.6052/j.issn.1000-4750.2020.11.0863
中图分类号：
学科分类号：
摘要：
The inflow turbulence generation technique in the large eddy simulation (LES) research is a hot topic in the field of computational wind engineering. Based on the narrowband synthesis random flow generation (NSRFG) approach, the quantitative relationship between the tuning factor γj and the dimensionless length scale β is theoretically derived through deep investigation of several important parameters, i.e., the dimensionless length scale β, the spatial correlation R, and the tuning factor γj. An improved inflow turbulence generation technique, namely the improved NSRFG (INSRFG) method, is subsequently proposed. The LES simulations of turbulent wind fields corresponding to four typical standard wind terrains defined in the code are carried out by utilizing this method. The numerical comparison shows its applicability and accuracy in simulating the turbulent atmospheric boundary layer (ABL) flows, which satisfy the requirements of the fluctuating wind characteristics, such as the wind speed spectrum and the spatial correlation, and successfully achieve the equilibrium status for the numerical simulation of the ABL flow. The systematic study in this work shows that the proposed INSRFG technique has the advantages of clear parameter definition, compact mathematical expression and relatively high calculation efficiency, and has the potential to become a general inflow turbulence generator for large eddy simulations of building structures. © 2021, Engineering Mechanics Press. All right reserved.
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页码：17 / 24
页数：7
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