Study of Surface Layer Characteristics in the Presence of Suspended Snow Particles Using Observational Data and Large Eddy Simulation

Pub Date : 2024-07-02 DOI:10.1134/s000143382470021x
V. I. Suiazova, A. V. Debolskiy, E. V. Mortikov
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Abstract

A snowdrift is a two-phase flow consisting of air and suspended particles. In the presence of snow particles in the air, additional stability appears in the surface layer due to the density gradient. The density gradient reduces turbulence and affects the properties of the surface layer. Therefore, to describe the properties of the flow with included snow particles, additional clarifications are required. A description of the surface layer parameterization with the presence of suspended snow particles is presented in this paper. The formulation of the effect of snow particles consists of the reformulation of the Obukhov turbulent length scale. The novel surface layer parameterization allows one to take into account the effect of snow particles on turbulent flow and may improve the estimates of friction velocity and boundary-layer height.The parameterization was successfully tested on the observational data. A description of snow particle influence has been included in the large eddy simulation (LES) model. The numerical experiments confirmed an increase in the stability of the surface layer. The mechanism of influence of suspended particles on the surface layer is analogous to a thermal stabilization of the turbulent flow, in which negative buoyancy acts to reduce the turbulent kinetic energy (TKE).

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利用观测数据和大涡流模拟研究存在悬浮雪粒子时的表层特征
摘要飘雪是由空气和悬浮颗粒组成的两相流。当空气中存在雪粒时,由于密度梯度,表层会出现额外的稳定性。密度梯度减少了湍流并影响表层的特性。因此,为了描述含有雪粒的气流特性,需要进行额外的说明。本文介绍了存在悬浮雪粒的表层参数化。雪粒子效应的公式包括奥布霍夫湍流长度尺度的重新表述。新颖的表层参数化可以考虑雪粒对湍流的影响,并可改进摩擦速度和边界层高度的估算。在大涡度模拟(LES)模型中加入了对雪粒子影响的描述。数值实验证实了表层稳定性的提高。悬浮颗粒对表层的影响机制类似于湍流的热稳定,其中负浮力的作用是降低湍流动能(TKE)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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