LES不同模型对陡坡风场的空气动力场研究
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摘要
利用LES的SM模型、DSM模型和WALE模型分析了二维陡坡地形的空气动力场,并将其模拟结果与试验和RNGκ-ε湍流模型的结果进行对比分析。结果表明,LES的亚格子模型在模拟分离区、速度分布和湍流强度分布方面较RANS模型更具准确性和全面性;WALE模型是三个亚格子模型中计算时间较短且结果更准确的亚格子模型,因此选择WALE模型模拟复杂地形风电场的空气动力场,可以获取更加精准的流场分布,为工程应用提供理论参考。
The SM model,DSM model and WALE model of LES were used to study the aerodynamic field of two-dimensional steep hill.And then the simulation results were compared with the results of experiment and RNGκ-εturbulence model.The results show that the simulations of the subgrid-scale models of LES are more accurate and comprehensive than the RANS model in separation zone and on the distributions of velocity and turbulence intensity.The WALE model which takes less calculation time,could give the most reasonable results.Using the WALE subgrid-scale model to simulate the aerodynamic field of wind farm in complex terrain could obtain more accurate flow field distribution,which could provide theoretical reference for engineering applications.
The SM model,DSM model and WALE model of LES were used to study the aerodynamic field of two-dimensional steep hill.And then the simulation results were compared with the results of experiment and RNGκ-εturbulence model.The results show that the simulations of the subgrid-scale models of LES are more accurate and comprehensive than the RANS model in separation zone and on the distributions of velocity and turbulence intensity.The WALE model which takes less calculation time,could give the most reasonable results.Using the WALE subgrid-scale model to simulate the aerodynamic field of wind farm in complex terrain could obtain more accurate flow field distribution,which could provide theoretical reference for engineering applications.
引文
[1]薛飞飞,许昌,韩星星,等.基于CFD的复杂地形风电场地形改造方案研究[J].太阳能学报,2017,38(7):1 959-1 965.
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[3]赵永锋,康顺,梁思超.复杂地形风场CFD模拟计算域的讨论[J].太阳能学报,2015,36(2):355-361.
[4]Persson T,Liefvendahl M,Bensow R E,et al.Numerical Investigation of the Flow over an Axisymmetric Hill using LES,DES,and RANS[J].Journal of Turbulence,2006,7(6):1-17.
[5]王婷婷,杨庆山.基于FLUENT的大气边界层风场LES模拟[J].计算力学学报,2012,29(5):734-739,746.
[6]Liu Z,Ishihara T,Tanaka T,et al.LES Study of Turbulent Flow Fields over a Smooth 3-D Hill and a Smooth 2-D Ridge[J].Journal of Wind Engineering and Industrial Aerodynamics,2016,153:1-12.
[7]Cao S,Tamura T.Experimental Study on Roughness Effects on Turbulent Boundary Layer Flow over a Two-dimensional Steep Hill[J].Journal of Wind Engineering and Industrial Aerodynamics,2006,94(1):1-19.
[8]Smagorinsky J.General Circulation Experiments with the Primitive Equation:I.The Basic Experiment[J].Monthly Weather Review,1963,91(3):99-164.
[9]Lilly D K.A Proposed Modification of the Germanosubgrid-scale Closure Method[J].Physics of Fluids,1992,4(3):633-635.
[10]Nicoud F,Ducros F.Subgrid-scale Stress Modeling Based on the Square of the Velocity Gradient Tensor[J].Flow,Turbulence and Combustion,1999,62(3):183-200.
[2]周洋,许昌,韩星星,等.基于致动线模型的风力机尾流场数值研究[J].水电能源科学,2017(3):177-181.
[3]赵永锋,康顺,梁思超.复杂地形风场CFD模拟计算域的讨论[J].太阳能学报,2015,36(2):355-361.
[4]Persson T,Liefvendahl M,Bensow R E,et al.Numerical Investigation of the Flow over an Axisymmetric Hill using LES,DES,and RANS[J].Journal of Turbulence,2006,7(6):1-17.
[5]王婷婷,杨庆山.基于FLUENT的大气边界层风场LES模拟[J].计算力学学报,2012,29(5):734-739,746.
[6]Liu Z,Ishihara T,Tanaka T,et al.LES Study of Turbulent Flow Fields over a Smooth 3-D Hill and a Smooth 2-D Ridge[J].Journal of Wind Engineering and Industrial Aerodynamics,2016,153:1-12.
[7]Cao S,Tamura T.Experimental Study on Roughness Effects on Turbulent Boundary Layer Flow over a Two-dimensional Steep Hill[J].Journal of Wind Engineering and Industrial Aerodynamics,2006,94(1):1-19.
[8]Smagorinsky J.General Circulation Experiments with the Primitive Equation:I.The Basic Experiment[J].Monthly Weather Review,1963,91(3):99-164.
[9]Lilly D K.A Proposed Modification of the Germanosubgrid-scale Closure Method[J].Physics of Fluids,1992,4(3):633-635.
[10]Nicoud F,Ducros F.Subgrid-scale Stress Modeling Based on the Square of the Velocity Gradient Tensor[J].Flow,Turbulence and Combustion,1999,62(3):183-200.