Direct Numerical Simulation of Large Particle-laden Turbulent Channel flow Using Fictitious Domain Method
作者单位：Department of MechanicsZhejiang University
会议名称：《The 16th Annual Conference of Hong Kong Society of Theoretical and Applied Mechanics 2012、The 1st Mainland-Hong Kong Youth Forum on Mechanics 2012、The 8th Shanghai-Hong Kong Forum on Mechanics and Its Application 2012》
会议日期：2012年
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）]
基 金：support from the National Natural Science Foundation of China(No. 11072217)
关 键 词：Direct Numerical Simulation of Large Particle laden Turbulent Channel flow Using Fictitious Domain Method
摘 要：It has been recognized that suspended particles can modify the characteristic of turbulent flow *** fully-resolved direct numerical simulation approach is one kind of newly developed simulation method for particulate flows,in which the interface between the particle and fluid domains needs to be considered and the hydrodynamic force on each particle is determined from the solution of the fluid flow around the particle,and for the flow field the direct numerical simulation method is used if the flow is *** the present study,A fictitious domain method is used to perform fully resolved numerical simulations of particle-laden turbulent flow in a horizontal channel. The effects of large particles of diameter 0.05 and 0.1 times the channel height on the turbulence statistics and structures are investigated for different volume *** results indicate that,when the particle sedimentation effect is negligible(*** buoyant),the presence of particles decreases the maximum *** the streamwise velocity fluctuation near the wall by weakening the intensity of the large-scale streamwise vortices,while increasing the *** the streamwise fluctuating velocity in the region very close to the wall and in the centre region,and on the other hand, the particles increase the *** transverse and spanwise fluctuating velocities in the near-wall region by inducing the small-scale *** effects of the particles on the velocity fluctuations are more pronounced at higher particle volume fractions and smaller particle sizes.