• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>ASME Fluids Engineering Division summer conference;FEDSM2009 >DIRECT NUMERICAL SIMULATION OF FOUR WAY-COUPLED GAS-SOLID FLOW AND DEPOSITION IN A TURBULENT CHANNEL FLOW
【24h】

DIRECT NUMERICAL SIMULATION OF FOUR WAY-COUPLED GAS-SOLID FLOW AND DEPOSITION IN A TURBULENT CHANNEL FLOW

机译：湍流通道中四路耦合气固两相流和沉积的直接数值模拟

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study was concerned with the effects of particle-particle collisions and two-way coupling on the dispersed and carrier phase turbulence fluctuations in a channel flow. The time history of the instantaneous turbulent velocity vector was generated by the two-way coupled direct numerical simulation (DNS) of the Navier-Stokes equation via a pseudospectral method. The particle equation of motion included the drag and the shear induced lift forces. The effect of particles on the flow was included in the analysis via a feedback force that acted on the computational grid points. Several simulations for different particle relaxation times and particle mass loadings were performed, and the effects of the inter-particle collisions and two-way coupling on the particle deposition velocity, fluid and particle fluctuating velocities, particle normal mean velocity, and particle concentration profiles were determined.It was found that, when particle-particle collisions were included in the computation but two-way coupling effects were ignored, the particle normal fluctuating velocity increased in the wall region causing an increase in the particle deposition velocity. When the particle collisions were neglected but the particle-fluid two-way coupling effects were accounted for, the particle normal fluctuating velocity decreased near the wall causing a decrease in the particle deposition velocity. For the physical case that both inter-particle collisions and two-way coupling effects are present, a series of four-way coupling simulations was performed. It was found that the particle deposition velocity increased with massloading. The results for the particle concentration profile indicated that the inclusion of either two-way coupling or inter-particle collisions into the computation reduced the accumulation of particles near the wall. Comparisons of the present simulation results with the available experimental data and earlier numerical results were also presented.
机译：这项研究涉及颗粒-颗粒碰撞和双向耦合对通道流中分散相和载体相湍流波动的影响。瞬时湍流速度矢量的时程是通过伪谱方法通过Navier-Stokes方程的双向耦合直接数值模拟（DNS）生成的。运动的粒子方程包括阻力和剪切引起的升力。通过作用在计算网格点上的反馈力将颗粒对流动的影响包括在分析中。对不同的粒子弛豫时间和粒子质量负荷进行了几种模拟，粒子间碰撞和双向耦合对粒子沉积速度，流体和粒子波动速度，粒子法向平均速度和粒子浓度分布的影响为决定。 发现，当在计算中包括颗粒-颗粒碰撞但忽略了双向耦合效应时，在壁区域中颗粒法向波动速度增加，导致颗粒沉积速度增加。当忽略颗粒碰撞但考虑了颗粒-流体双向耦合效应时，壁附近的颗粒法向脉动速度降低，导致颗粒沉积速度降低。对于同时存在粒子间碰撞和双向耦合效果的物理情况，执行了一系列的四向耦合仿真。发现颗粒沉积速度随质量的增加而增加 加载中。颗粒浓度分布图的结果表明，在计算中包括双向耦合或颗粒间碰撞会减少壁附近颗粒的堆积。还介绍了当前的模拟结果与可用的实验数据和较早的数值结果的比较。

著录项

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