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首页> 外文期刊>International Journal of Heat and Mass Transfer >Laminar to turbulent flow transition inside the boundary layer adjacent to isothermal wall of natural convection flow in a cubical cavity
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Laminar to turbulent flow transition inside the boundary layer adjacent to isothermal wall of natural convection flow in a cubical cavity

机译：在立方体腔内与自然对流流等温壁相邻的边界层内部的湍流过渡。

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摘要

We investigate three-dimensional natural convection flow in an air-filled, differentially heated cubical cavity. The vertical wall on the left is heated and the vertical wall on the right is cooled, with the remaining four walls being adiabatic. We performed direct numerical simulations of the natural convection flow using discrete unified gas-kinetic scheme (DUGKS), with an improved implementation of boundary conditions. Thin boundary layers are developed along the two isothermal walls. The laminar to turbulent flow transition inside the boundary layers is studied in this paper. The simulations are conducted at three Rayleigh numbers of 1.5 × 10~9, 1.0 × 10~(10), 1.0 × 10~(11) using nonuniform grids with resolution up to 320~3. The Prandtl number is fixed at 0.71. We provide a detailed analysis of the transition from laminar to turbulent flow inside the vertical boundary layers and its influence on the rate of heat transfer. Time traces of temperature and velocity, time-averaged flow field, statistics of fluctuation fields are presented to illustrate distinct behaviors in the laminar and turbulent thermal boundary layer, as well as to determine the transition location at different Ra numbers. The average Nusselt numbers for different Ra numbers are compiled and compared to previous results. A guideline of the resolution requirement is suggested based on the Ra scaling of laminar thermal boundary layer.
机译：我们研究了一个充满空气的差异加热的立方腔中的三维自然对流流。左侧的垂直壁被加热，右侧的垂直壁冷却，其余四壁是绝热的。我们使用离散的统一气体动力学方案（Dugks）进行了自然对流流的直接数值模拟，并改善了边界条件的实现。沿两个等温壁开发的薄边界层。本文研究了边界层内部的湍流过渡的层。使用不均匀的网格在320×10〜（11）的三个瑞利数量的三个瑞利码的三次瑞利数进行仿真。 Prandtl号码固定在0.71。我们对垂直边界层内部与湍流的过渡进行了详细的分析及其对热传递速率的影响。呈现温度和速度，时间平均流场的时间迹线，提出了波动场的统计，以说明层层和湍流热边界层中的不同行为，以及确定不同RA数处的过渡位置。编译不同RA编号的平均营养号码并与以前的结果进行比较。基于层流热边界层的RA缩放，提出了分辨率要求的指导。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第3期|120822.1-120822.19|共19页
  • 作者

    Xin Wen; Lian-Ping Wang; Zhaoli Guo; Dauren B. Zhakebayev;

  • 作者单位

    Department of Mechanical Engineering 126 Spencer Laboratory University of Delaware Newark Delaware 19716-3140 USA;

    Department of Mechanical Engineering 126 Spencer Laboratory University of Delaware Newark Delaware 19716-3140 USA Guangdong Provincial Key Laboratory of Turbulence Research and Applications Center for Complex Flows and Soft Matter Research and Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen 518055 Guangdong China Center for Complex Flows and Soft Matter Research Southern University of Science and Technology Shenzhen 518055 Guangdong China Guangdong Provincial Key Laboratory of Turbulence Research and Applications Southern University of Science and Technology Shenzhen 518055 Guangdong China Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications Southern University of Science and Technology Shenzhen 518055 China;

    State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan P.R. China;

    Al Farabi Kazskh National University Almaty Kazakhstan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Natural convection; Flow transition; DUGKS; Accurate implementation of boundary; conditions;

    机译：自然对流;流动过渡;Dugks;准确实施边界;使适应;

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