地表非均匀加热影响对流边界层湍流特征的大涡模拟研究*

南京大学学报(自然科学版) ›› 2011, Vol. 47 ›› Issue (6): 643–656.

地表非均匀加热影响对流边界层湍流特征的大涡模拟研究*

殷雷1,2，孙鉴泞1**，刘罡

出版日期:2015-05-08 发布日期:2015-05-08
作者简介: (1.南京大学大气科学学院，南京，210093；2. Department of Geological Sciences
Jackson School of Geoscienes,The University of Tcxas at Austin, USA)
基金资助:
国家自然科学基金(40975004)，国家重点基础研究发展计划(2010CB428501)

Large-eddy simulation on the turbulence characteristics
in the convective boundary layer driven by heterogeneous surface heating

Yin Lei^1.2，Sun Jian NinG¹ ,Liu Gang ¹

Online:2015-05-08 Published:2015-05-08
About author: (1 .School of Atmospheric Sciences, Nanjing University, Nanjing, 210093，China
2. Department of Geological Sciences Jackson School of Geoscienes,The University of Tcxas at Austin, USA)

摘要/Abstract

摘要： 木文运用大涡模拟方法研究了地表非均匀加热对边界层湍流特征的影响.共进行五个算例的数值模拟，其中一个算例为地表均匀加热，四个非均匀算例的地表加热方式均采用“马赛克”分布，非均
匀尺度分别为1. 2 km, 2. 5 km, 5. 0 km和10. 0 km，其平均地表热通量与地表均匀加热算例相同.模拟结果表明:地表非均匀加热激发出有组织湍流涡旋，非均匀尺度越大越有利于有组织湍流涡旋的维持;当
非均匀尺度足够大时，边界层湍流能量明显增大，增大的原因在于水平湍流运动的显著增强;湍流温度方差随着非均匀尺度增大而增大，但该效应在边界层发展过程中逐渐减弱;地表非均匀加热造成热量垂
直输送的水平分布不均匀，当边界层高度小于非均匀尺度时不均匀性贯穿整个边界层，当边界层高度大于非均匀尺度时这种不均匀性只存在于边界层的卜部;非均匀尺度为1. 2 km的算例结果表明，地表非
均匀加热在混合层中造成的扰动影响的水平范围不超过非均匀尺度的4倍.

Abstract: Largreddy simulations arc employed to investigate the influence of heterogeneous surface heating on the turbulence characteristics in the connective boundary layer (CBL).There arc five simulated cases. One is driven by
homogeneous surface heating, while the other four arc driven by heterogeneous surface heating. For the heterogeneous cases, the patterns of surface heating arc arranged as mosairlike distributions with two different
surface heat fluxes in the neighbor patches, and the heterogeneity scale in four different cases is 1. 2 km, 2. 5 km, 5. 0 km, and 10.0 km, respectively. The mean surface heat fluxes arc same as that in the homogeneous case. The
results show that, heterogeneous surface heating can stimulate organized turbulent eddies, and the larger the heterogeneity scale is, the longer the organized turbulent eddies can sustain.The largest volum}averaged turbulent
kinetic energy(TKE) is produced in the case with the largest heterogeneity scale，while the TKEs in the other heterogeneous cases arc close to those in the homogeneous case.This result indicates that the TKE is not enhanced
unless the scale of the heterogeneous surface heating is large enough.The reason for the enhancement of TKE is that the horizontal turbulent velocity variance is significantly enlarged.The potential temperature variance is
enhanced more significantly by a larger surface heterogeneity scale, but this effect diminishes with the increasing CBL height. The horizontally heterogeneous distribution of heat flux is caused by heterogeneous surface heating.
When the CBL height is larger than the heterogeneity scale, the heterogeneous distribution exists in the whole CBL，while when the CBL height is smaller than the heterogeneity scale, the heterogeneous distribution can only exist in
the lower part of the CBL. The results form the case with the minimum surface heterogeneity scale show that the heat flux averaged in the area with the width of 4 times of the heterogeneity scale is close to that averaged in the domain

殷雷1,2，孙鉴泞1**，刘罡
. 地表非均匀加热影响对流边界层湍流特征的大涡模拟研究*
[J]. 南京大学学报(自然科学版), 2011, 47(6): 643–656.

Yin Lei^1.2，Sun Jian NinG¹ ,Liu Gang ¹. Large-eddy simulation on the turbulence characteristics
in the convective boundary layer driven by heterogeneous surface heating
[J]. Journal of Nanjing University(Natural Sciences), 2011, 47(6): 643–656.

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