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首页> 外文会议>International symposium on computational wind engineering;CWE-96 >Cellular convection embedded in the convective planetary boundary layer surface layer
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Cellular convection embedded in the convective planetary boundary layer surface layer

机译：嵌入在对流行星边界层表面层中的蜂窝对流

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Cellular convection was first studied in the laboratory by Benard (Ann. Chim. Phys. 23 (1901) 62-144) and Rayleigh (Phil. Mag. Ser. 6(1916) 529-546) investigated these motions from a theoretical perspective. He defined a dimensionless number, now called the Rayleigh number, which is the ratio of convective transport to molecular transport, and found that if a certain critical value is exceeded, cellular convection occurs. Mesoscale cellular convection (MCC) is a common occurrence in the plantary boundary layer. Agee (Dyn. Atmos. Oceans 10 (1987) 317-341) discussed the similarities and differences of MCC and classical Rayleigh-Benard convection. A similar cellular pattern can be seen in the convective boundary layer (CBL) surface layer. It is known that in the CBL, air near the surface converges into thermals producing updrafts. This produces a 'spoke' type pattern similar to the mesoscale cellular or Rayleigh-Benard convection. This paper will focus on applyign Rayleigh-Benard convection criteria, using a linearized perturbation method, to the CBL surface layer produced by Large Eddy Simulation (LES). We will investigate the length scales of turbulence in the CBL surface layer and compare them to those predicted from linear theory. Simularities and differences will be discussed between the LES produced surface layer and classical Rayleigh-Benard convection theory.
机译：首先在Benard（Ann.Chim.Chim.mal.7（1901）62-144）和Rayleigh（Phil.Ser。6（1916）529-546）从理论视角调查了这些动作，首先在实验室进行了蜂窝话口的对流。他定义了无量纲数，现在称为瑞利数，即对流传输与分子运输的比率，发现如果超过了某个临界值，则会发生细胞对流。 Messcale蜂窝对流（MCC）是山上边界层的常见发生。 AGEE（DYN。ATMOS。海洋10（1987）317-341）讨论了MCC和古典瑞利邦对流的相似之处。在对流边界层（CBL）表面层中可以看出类似的蜂窝图案。众所周知，在CBL中，表面附近的空气会聚到产生上升流的热量中。这产生了类似于Mesoscale蜂窝或瑞利Benard对流的“辐条”类型模式。本文将专注于使用线性化扰动方法应用于大型涡流模拟（LES）产生的CBL表面层的绘制瑞利奔列对流标准。我们将研究CBL表面层中湍流的长度尺度，并将它们与线性理论预测的那些进行比较。 LES产生的表面层和古典瑞利 - 贝纳德对流理论将讨论模拟和差异。

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