| 近壁湍流和微颗粒的两相作用及减阻效应 |
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| 引用本文： | 唐一敏,陈林烽,董宇红.近壁湍流和微颗粒的两相作用及减阻效应[J].上海大学学报(自然科学版),2012(3):282-287. |
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| 作者姓名： | 唐一敏 陈林烽 董宇红 |
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| 作者单位： | 上海大学上海市应用数学和力学研究所,上海200072 |
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| 基金项目： | 国家自然科学基金资助项目(10972132);上海市教委科研创新基金资助项目(09YZ03);上海大学研究生创新基金资助项目(SHUCX102359) |
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| 摘 要： | 为研究颗粒和近壁湍流的相互作用和流动阻力问题,采用点-力双向耦合模型并结合Lagrange粒子追踪法,对负载颗粒的槽道湍流进行直接数值模拟(direct numerical simulation,DNS).同时,从含颗粒作用外力项的NavierStokes方程出发,推导颗粒加载湍流的阻力系数表达式.考察较低容积比下粒径小于Kolomogrov尺度的颗粒对湍流结构的调制以及湍流减阻现象,讨论颗粒尺度和数量等加载参数对阻力系数的影响,发现在本研究范围内的细微颗粒对湍流的调制以抑制作用为主,同时产生明显的减阻效应.
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| 关 键 词： | 颗粒 直接数值模拟 双向耦合 阻力系数 湍流调制 |
Numerical Investigation of Particle Interaction with Wall-Bounded Turbulence and Drag Reduction |
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| TANG Yi-min,CHEN Lin-feng,DONG Yu-hong.Numerical Investigation of Particle Interaction with Wall-Bounded Turbulence and Drag Reduction[J].Journal of Shanghai University(Natural Science),2012(3):282-287. |
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| Authors: | TANG Yi-min CHEN Lin-feng DONG Yu-hong |
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| Institution: | (Shanghai Institute of Applied Mathematics and Mechanics.Shanghai University.Shanghai 200072.China) |
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| Abstract: | This paper reports turbulence modulations and the accompanying drag reduction observed in direct numerical simulation(DNS) of particle-laden channel flow.The point-force two-way coupling model is applied to describe the interaction between the particle and the turbulence.Lagrangian tracking approach is used to describe the dynamics of particles,and derive a formula of drag coefficient from Navier-Stokes equations.Flow visualizations show that turbulence production can be suppressed by particles.Comparing the results of particle-laden and unladen flows,the impact of the diameter and number of the particles on friction reduction are examined. |
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| Keywords: | particles direct numerical simulation(DNS) two-way coupling drag coefficient turbulence modulation |
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