明渠湍流边界层中颗粒的运动与分布

宋晓阳; 及春宁; 许栋

doi:10.6052/0459-1879-14-164

明渠湍流边界层中颗粒的运动与分布

doi: 10.6052/0459-1879-14-164

天津大学水利工程仿真与安全国家重点实验室, 天津300072

基金项目: 国家自然科学基金创新研究群体科学基金(51321065), 天津市青年科学基金(12JCQNJC02600, 12JCQNJC05600) 和国家自然科学基金(50809047, 51009105) 资助项目.

详细信息

通讯作者:
及春宁,博士,副教授,主要研究方向:泥沙动力学数值模拟.E-mail:cnji@tju.edu.cn

中图分类号: TV142
计量
- 文章访问数: 1051
- HTML全文浏览量: 64
- PDF下载量: 683
- 被引次数: 0
出版历程
- 收稿日期: 2014-06-06
- 修回日期: 2014-12-09
- 刊出日期: 2015-03-18

DISTRIBUTION AND MOTION OF PARTICLES IN THE TURBULENTBOUNDARY LAYER OF CHANNEL FLOW

Tianjin University, State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin 300072, China

Funds: The project was supported by the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (51321065), Natural Science Foundation of Tianjin (12JCQNJC02600,12JCQNJC05600) and the National Natural Science Foundation of China (50809047, 51009105).

摘要

摘要: 利用直接数值模拟、点球浸入边界法和颗粒离散元法相结合的方法, 模拟了颗粒在明渠湍流边界层中的运动, 并对颗粒的瞬时位置进行了Voronoi 分析, 定量研究了颗粒在湍流边界层中的运动和分布规律. 研究发现:颗粒的输运对湍流的统计特征有影响, 其运动与近壁区湍流拟序结构密切相关, 在"喷发"结构作用下被带离壁面, 在"扫掠" 结构和自身重力作用下回到壁面; 在湍流边界层中, 颗粒倾向于聚集在低流速带, 呈条带状分布;颗粒在大部分时间处于"簇"状态, 偶尔跳跃到"空" 状态, 但能够很快回到邻近低速区域.
- 颗粒运动 /
- 湍流边界层 /
- 点球浸入边界法 /
- 颗粒离散元 /
- Voronoi 分析
Abstract: This paper numerically investigates particles immersed in the turbulent boundary layer of channel flow. The methodology is a combination of three cutting-edge numerical technologies, i.e., the direct numerical simulation of turbulent flow, the point-particle immersed boundary method and the discrete particle method. We quantify the motion and distribution of near-wall particles by means of Voronoi analysis based on a set of instantaneous particle positions. It was found that the motion of particles have strong effects on flow velocity profiles and turbulence intensities, is closely related to the dynamics of the near wall coherent flow structures, i.e., the ejections of low-speed fluid carry particles towards the outer flow and the sweeps of high-speed fluid as well as gravitational settling bring particles back towards the wall. Most of particles in the turbulent boundary layer reside preferentially in low speed fluid regions and streamwise-aligned streaky structures. Particles keep in "clusters" over substantial time scales and sometimes they jump into "voids", after which those particles relatively quickly migrate back to a neighbouring low speed region.
- particles motion /
- turbulent boundary layers /
- point-particle immersed boundary method /
- discrete particle method /
- Voronoi analysis

HTML全文

参考文献(25)

王光谦. 河流泥沙研究进展. 泥沙研究, 2007, (2): 64-81 (Wang Guanqian. Advances in river sediment research. Journal of Sediment Research, 2007, (2): 64-81 (in Chinese))

Floris R,van Thienen P. Experimental investigation of turbulent particle radial transport processes in DWDS using optical tomography. Drinking Water Engineering and Science, 2011, 4(1): 61-83

陈鑫, 余锡平. 基于两相紊流模型的非平衡输沙研究. 力学学报, 2012, 44(1): 65-70 (Chen Xin, Yu Xiping. A two-phase numerical model for non-equilibrium sediment transport. Chinese Journal of Theoretical and Applied Mechanics, 2012, 44(1): 65-70 (in Chinese))

吴修广, 沈永明, 郑永红, 等. 非正交曲线坐标下水流和污染物扩散输移的数值计算. 中国工程科学, 2003, 5(2): 57-61 (Wu Xiuguang, Shen Yongming, Zheng Yonghong, et al. Numerical computation of flow and pollutant diffusion-transportation with non-orthogonal curvilinear coordinates. Engineering Science, 2003, 5(2): 57-61 (in Chinese))

Shao X, Wu T, Yu Z. Fully resolved numerical simulation of particle-laden turbulent flow in a horizontal channel at a low Reynolds number. Journal of Fluid Mechanics, 2012, 693: 319-344

Kidanemariam A G, Chan-Braun C, Doychev T, et al. Direct numerical simulation of horizontal open channel flow with finite-size, heavy particles at low solid volume fraction. New Journal of Physics, 2013, 15, 025031

Soldati A, Marchioli C. Sediment transport in steady turbulent boundary laryers: Potentials, limitations, and perspectives for Lagrangian tracking in DNS and LES. Advances in Water Resources, 2012, 48: 18-30

Rashidi M, Hetsroni G, Banerjee S. Particle-turbulence interaction in a boundary layer. International Journal of Multiphase Flow, 1990, 16(6): 935-949

Hetsroni G, Rozenblit R. Heat transfer to a liquid-solid mixture in a flume. International Journal of Multiphase Flow, 1994, 20(4): 671-689

Yung B P K, Merry H, Bott T R. The role of turbulent bursts in particle re-entrainment in aqueous systems. Chemical Engineering Science, 1989, 44(4): 873-882

Ji C, Munjiza A, Avital E, et al. Saltation of particles in turbulent channel flow. Physical Review E, 2014, 89(5), 052202

Monchaux R, Bourgoin M, Cartellier A. Preferential concentration of heavy particles: A Voronoi analysis. Physics of Fluids, 2010, 22(10), 103304

Ji C, Munjiza A, Avital E, et al. Direct numerical simulation of sediment entrainment in turbulent channel flow. Physics of Fluids, 2013, 25(5), 056601

及春宁, 陈威霖, 宋晓阳, 等. 明渠湍流中泥沙颗粒输移的大涡模拟研究. 泥沙研究, 2014, (4): 1-8 (Ji Chunning, Chen Weilin, Song Xiaoyang, et al. Large eddy simulation of sediment particles transport in turbulent open channel flow. Journal of Sediment Research, 2014, (4): 1-8 (in Chinese))

及春宁, 王元战, 王建峰. 虚拟区域法在流固耦合问题中的应用. 力学学报, 2009, 41(1): 49-59 (Ji Chunning, Wang Yuanzhan, Wang Jianfeng. Application of the fictitious domain method in fluid- structure interaction. Chinese Journal of Theoretical and Applied Mechanics, 2009, 41(1): 49-59 (in Chinese))

Morsi S A, Alexander A J. An investigation of particle trajectories in two-phase flow systems. Journal of Fluid Mechanics, 1972, 55(2): 193-208

Lee Jysoo, Herrmann HJ. Angle of repose and angle of marginal stability: molecular dynamics of granular particles. Journal of Physics A: Mathematical and General, 1993, 26(2): 373-383

Nabi M, de Vriend H J, Mosselman E, et al. Detailed simulation of morphodynamics: 1. Hydrodynamic model. Water Resources Research, 2012, 48(12), W12523

Nabi M, de Vriend H J, Mosselman E, et al. Detailed simulation of morphodynamics: 2. Sediment pickup, transport, and deposition. Water Resources Research, 2013, 49(8): 1-17

Nabi M, de Vriend H J, Mosselman E, et al. Detailed simulation of morphodynamics: 3. Ripples and dunes. Water Resources Research, 2013, 49(9): 1-15

Zhou K, Attili A, Alshaarawi A, et al. Simulation of aerosol nucleation and growth in a turbulent mixing layer. Physics of Fluids, 2014, 65, 065106

Kim J, Moin P, Moser R. Turbulence statistics in fully developed channel flow at low Reynolds number, Journal of Fluid Mechanics, 1987, 177: 133-166

Muste M, Yu K, Fujita I, et al. Two-phase flow insights into open-channel flows with suspended particles of different densities. Environmental Fluid Mechanics, 2009, 9(2): 161-186

Chan-Braun C, Garcia-Villalba M, Uhlmann M. Force and torque acting on particles in a transitionally rough open-channel flow. Journal of Fluid Mechanics, 2011, 684: 441-474

Jarai-Szabo Ferenca, Zoltan Nedaa. On the size distribution of Poisson Voronoi cells. Physica A: Statistical Mechanics and its Applications, 2007, 385(2): 518-526

施引文献

资源附件(0)

访问统计