• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physics of fluids >Direct numerical simulation of turbulent boundary layer with fully resolved particles at low volume fraction
【24h】

Direct numerical simulation of turbulent boundary layer with fully resolved particles at low volume fraction

机译：低体积分数完全分辨颗粒的湍流边界层的直接数值模拟

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the present work, a direct numerical simulation (DNS) of dilute particulate flow in a turbulent boundary layer has been conducted, containing thousands of finite-sized solid rigid particles. The particle surfaces are resolved with the multi-direct forcing immersed-boundary method. This is, to the best of the authors' knowledge, the first DNS study of a turbulent boundary layer laden with finite-sized particles. The particles have a diameter of approximately 11.3 wall units, a density of 3.3 times that of the fluid, and a solid volume fraction of 1/1000. The simulation shows that the onset and the completion of the transition processes are shifted earlier with the inclusion of the solid phase and that the resulting streamwise mean velocity of the boundary layer in the particle-laden case is almost consistent with the results of the single-phase case. At the same time, relatively stronger particle movements are observed in the near-wall regions, due to the driving of the counterrotating streamwise vortexes. As a result, increased levels of dissipation occur on the particle surfaces, and the root mean square of the fluctuating velocities of the fluid in the near-wall regions is decreased. Under the present parameters, including the particle Stokes number St(+) = 24 and the particle Reynolds number Rep = 33 based on the maximum instantaneous fluid-solid velocity lag, no vortex shedding behind the particle is observed. Lastly, a trajectory analysis of the particles shows the influence of turbophoresis on particle wall-normal concentration, and the particles that originated between y(+) = 60 and 2/3 of the boundary-layer thickness are the most influenced. Published by AIP Publishing.
机译：在本作工作中，已经进行了湍流边界层中稀颗粒流的直接数值模拟（DNS），含有数千个有限尺寸的固体刚性颗粒。用多直接强制浸入边界法分辨颗粒表面。这是据作者的知识，这是一个具有有限尺寸粒子的湍流边界层的第一个DNS研究。颗粒的直径约为11.3壁单元，密度为流体的3.3倍，固体体积分数为1/1000。模拟表明，过渡过程的开始和完成随着固体相位越早偏移，并且粒子壳体中的边界层的最终平均速度几乎与单一的结果一致。阶段案例。同时，由于驱动反向流动涡旋，在近壁区域中观察到相对较强的颗粒运动。结果，在颗粒表面上发生的耗散水平增加，并且近壁区域中的流体的波动速度的根均线降低。在本参数下，包括基于最大瞬时液体固体速度滞后的粒子尖峰次数ST（+）= 24和粒子雷诺数Rep = 33，观察到颗粒后面的涡旋脱落。最后，颗粒的轨迹分析显示湍流率对粒子壁正常浓度的影响，并且源自边界层厚度的Y（+）= 60和2/3之间的颗粒最受影响。通过AIP发布发布。

著录项

  • 来源
    《Physics of fluids》 |2017年第5期|共9页
  • 作者

    Luo Kun; Hu Chenshu; Wu Fan; Fan Jianren;

  • 作者单位

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 流体力学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号