Parametric study of large-eddy simulation to capture scaling laws of velocity fluctuations in neutral atmospheric boundary layers

Feng, Dachuan1,2; Gupta, Vikrant2,3; Li, Larry K. B.1,4; Wan, Minping2,3,5

2024-04-01

10.1063/5.0202327

PHYSICS OF FLUIDS   影响因子和分区

1070-6631

1089-7666

The development of digital twins for wind farms often involves the use of large-eddy simulation (LES) to model atmospheric boundary layers. Existing LES solvers primarily focus on accurately capturing streamwise fluctuations. They, however, overlook the less energetic cross-stream fluctuations, which play a crucial role in wind turbine wake evolution. In this study, we conduct a systematic parametric study and incorporate changes in an open-source LES solver. The improved solver is able to predict all three components of velocity fluctuations in alignment with the scaling laws derived from the attached-eddy hypothesis. In particular, we examine the impact of (i) the subgrid-scale model, (ii) the wall model, (iii) the von Karman constant, and (iv) the grid-cell aspect ratio. We find that although all these factors influence the prediction of velocity fluctuations, the grid-cell aspect ratio has the greatest effect on the spanwise and vertical velocity components. Notably, utilizing nearly isotropic grid cells leads to the best alignment of all three velocity component fluctuations with the scaling laws. Spectral analysis further demonstrates that the present LES solver accurately predicts the characteristic length scales for all velocity fluctuation components, making it a reliable tool for obtaining turbulent inflow conditions for wind farm modeling.

SCI ; EI

英语

通讯

China National Funds for Distinguished Young Scientists10.13039/501100005153[2021B0101190003] ; Key-Area Research and Development Program of Guangdong Province["12225204","12002147","12050410247"] ; National Natural Science Foundation of China["2023B1212060001","2020B1212030001"] ; Department of Science and Technology of Guangdong Province[16210419]

Mechanics ; Physics

Mechanics ; Physics, Fluids & Plasmas

WOS:001202924300006

AIP Publishing

PHYSICS

Web of Science

1.Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Peoples R China
2.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Guangdong Prov Key Lab Turbulence Res & Applicat, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Guangdong Hong Kong Macao Joint Lab Data Driven Fl, Shenzhen 518055, Peoples R China
4.Hong Kong Univ Sci & Technol, Guangdong Hong Kong Macao Joint Lab Data Driven Fl, Hong Kong, Peoples R China
5.Southern Univ Sci & Technol, Jiaxing Res Inst, Jiaxing 314031, Peoples R China

Feng, Dachuan,Gupta, Vikrant,Li, Larry K. B.,et al. Parametric study of large-eddy simulation to capture scaling laws of velocity fluctuations in neutral atmospheric boundary layers[J]. PHYSICS OF FLUIDS,2024,36(4).

Feng, Dachuan,Gupta, Vikrant,Li, Larry K. B.,&Wan, Minping.(2024).Parametric study of large-eddy simulation to capture scaling laws of velocity fluctuations in neutral atmospheric boundary layers.PHYSICS OF FLUIDS,36(4).

Feng, Dachuan,et al."Parametric study of large-eddy simulation to capture scaling laws of velocity fluctuations in neutral atmospheric boundary layers".PHYSICS OF FLUIDS 36.4(2024).