Large Eddy Simulation of Atmospheric Boundary-Layer Flows Under Time-Varying Upstream Inflows

Abstract

Abstract: In large eddy simulations (LES), a flat ground model and rough wedge ground models with different wedge heights were adopted to investigate near-surface wind field characteristics under condition of time-varying upstream inflows. In both flat ground model and rough wedge ground models, simulated results show that there is downdraft in peak period of gusty wind and updraft in valley period, respectively. Intensity of downdraft/updraft flows are related to ground roughness in upwind areas and amplitude of inflows. It follows that wind velocity and direction in atmospheric boundary layer always change over time in time-varying upstream inflows, which enhances transportation of mass and energy in actual atmospheric boundary layer.

Key words: time-varying inflow, gusty wind, atmospheric boundary layer, large eddy simulation, rough ground boundary layer

CLC Number:

P425

LI Weijun, ZHANG Yunwei, GU Zhaolin, DUAN Cuie, ZHANG Liyuan, LU Weizhen Jane. Large Eddy Simulation of Atmospheric Boundary-Layer Flows Under Time-Varying Upstream Inflows[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2016, 33(6): 691-697.

References

[1] 程雪玲, 曾庆存, 胡非, 等. 大气边界层强风的阵性和相干结构[J]. 气候与环境研究, 2007,12(3):227-243.
[2] 郑晓静, 张静红. 2010年3月19日沙尘暴期间甘肃民勤地区近地表的湍流性质[J]. 科学通报,2010, 55(22):2235-2240.
[3] GRIMMOND C S B, SALMOND J A, OKE T R, et al. Flux and turbulence measurements at a densely built-up site in Marseille:heat, mass (water and carbon dioxide), and momentum[J]. Journal of Geophysical Research, 2004, 109(1):1-19.
[4] WALTON A, CHENG A Y S, YEUNG W C. Large-eddy simulation of pollution dispersion in an urban street canyon-part I:comparison with field data[J]. Atmospheric Environment, 2002, 36(22):3601-3613.
[5] 顾兆林,张云伟. 城市与建筑风环境的大涡模拟方法及其应用[M]. 北京:科学出版社, 2014:1-263.
[6] ZHANG Y W, GU Z L, CHENG Y, et al. Effect of real-time boundary wind conditions on the air flow and pollutant dispersion in an urban street canyon-Large eddy simulations[J]. Atmospheric Environment, 2011,20(45):3352-3359.
[7] ZHANG Y W, GU Z L, CHENG Y, et al. Measurement of diurnal variations of PM2.5 mass concentrations and factors affecting pollutant dispersion in urban street canyons under weak-wind conditions in Xi'an[J]. Aerosol and Air Quality Research, 2012, 12:1261-1268.
[8] LIEN F S, YEE E. Numerical modeling of the turbulent flow developing within and over a 3-D building array, part Ⅲ:A distributed drag force approach, its implementation and application[J]. Boundary-Layer Meteorology, 2005, 2(114):287-313.
[9] HU Z B, YU B F, CHEN Z, et al. Numerical investigation on the urban heat island in an entire city with an urban porous media model[J].Atmospheric Environment, 2012,47:509-518.
[10] DONG Z B, MU Q S, WANG H T. Wind velocity profiles with a blowing sand boundary layer:theoretical simulation and experimental validation[J]. Journal of Geophysical Research, 2007, D19106(112):1-10.
[11] VINKOVIC I, AGUIRRE C, AYRAULT M, et al. Large-eddy simulation of the dispersion of solid particles in a turbulent boundary layer[J].Boundary-Layer Meteorology,2006,121(2):283-311.
[12] 曾庆存, 程雪玲, 胡非.大气边界层非常定下沉急流和阵风的起沙机理[J].气候与环境研究, 2007,12(3):244-250.
[13] 曾庆存, 胡非, 程雪玲.大气边界层阵风扬沙机理[J]. 气候与环境研究,2007,12(3):251-255.
[14] 崔桂香, 张兆顺, 许春晓, 等.城市大气环境的大涡模拟研究进展[J].力学进展, 2013,43(3):295-328.
[15] LIU Y S, MIAO S G, ZHANG C L, et al. Study on micro-atmospheric environment by coupling large eddy simulation with mesoscale model[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2012,107-108:106-117.
[16] MIAO Y C, LIU S H, CHEN B C, et al. Simulating urban flow and dispersion in Beijing by coupling a CFD model with the WRF model[J]. Advances in Atmospheric Science,2013,30(6):1663-1678.
[17] 张兆顺, 崔桂香, 许春晓.湍流大涡数值模拟的理论和应用[M]. 北京:清华大学出版社, 2009:90-101.
[18] 顾兆林, 张云伟, 雷康斌. 不同大气稳定度下绿化街谷流动的大涡模拟[J]. 中国科学:技术科学, 2011,1(41):109-118.
[19] 顾兆林. 风扬粉尘-近地层湍流与气固两相流[M]. 北京:科学出版社, 2010.
[20] KASTNER-KLEIN P, PLATE E J. Wind-tunnel study of concentration fields in street canyons[J]. Atmospheric Environment, 1999, 33(24-25):3973-3979.
[21] PAVAGEAU M, SCHATZMANN M. Wind tunnel measurements of concentration fluctuations in an urban street canyon[J]. Atmospheric Environment,1999,33(24-25):3961-3971.
[22] JASAK H. OpenFOAM:Open source CFD in research and industry[J]. International Journal of Naval Architecture and Ocean Engineering,2(1):89-94.
[23] 陶文铨. 数值传热学[M].西安:西安交通大学出版社,2001:1-566.
[24] JASAK H, WELLER H G, GOSMAN A D. High resolution NVD differencing scheme for arbitrarily unstructured meshes[J]. International Journal for Numerical Methods in Fluids, 1999,31:431-449.
[25] DURRAN D R. Numerical methods for fluid dynamics:with applications to geophysics[M]. Springer Science & Business Media,2010:1-511.
[26] 向小华, 苏长城, 王船海. GAMMA格式及DATE方法在SIMPLE算法中的应用[J]. 河海大学学报, 2008,36(4):471-474.
[27] PENG Z, SUN J N. Characteristics of the drag coefficient in the roughness sublayer over a complex urban surface[J]. Boundary-Layer Meteorology, 2014,3(153):569-580.
[28] CHENG X L, HU F, ZENG Q C. Simulation of wind gust structure in the atmospheric boundary layer with lattice Boltzmann method[J]. Chinese Science Bulletin,2012,57(10):1196-1203.
[29] KOK J F, PARTELI E J R, MICHAELS T I, et al. The physics of wind-blown sand and dust[J]. Rep Prog Phys,2012,75(106901):1-72.