摘要
给出了固体小颗粒在边界层中的Lagrangian运动方程，方程中包括受壁面影响的粘性阻力，Saffman升力及Magus升力等．使用频谱法，得到了颗粒响应流体的Lagrangian能谱的表达式，使用这些结果研究了各种响应特性．本文的结果清楚地表明了固体个颗粒在湍流扩散过程中，其湍流扩散是可能大于流体的．
The Lagrangian equations of motion of small solid particle in turbulent boundary layer flows, taking into account the effects of the drag force caused bythe wall presence, the Saffman and the Magus lift forces et al., is studied.Usingthe. spectral method, analytical exprossions relating the Lagrangian power spectra of particle velocity to that of the fluid are developed and the results areused to evaluate various response statistics. In this paper, the results clearlyshow that the turbulent diffusivity of the particle may be larger than that ofthe fluid for period of long-tlme.
出处
《应用数学和力学》
CSCD
北大核心
1997年第3期277-284,共8页
Applied Mathematics and Mechanics
关键词
Lagrangian模型
固体颗粒
湍流
边界层
Lagrangina model
turbulent motion
small solid particle
turbulentboundary layer
