Particle-resolved direct numerical simulation of collisions of bidisperse inertial particles in a homogeneous isotropic turbulence

Chen，Songying1; Chen，Xiaohang1; Wan，Dongdong1; Sun，Xun1; Ji，Li1; Wu，Ke2; Yang，Fan2; Wang，Guichao1,2

2020-10-01

10.1016/j.powtec.2020.08.023

POWDER TECHNOLOGY   影响因子和分区

0032-5910

1873-328X

A particle-resolved study of a collision system composed of heavy particles and light particles in a homogeneous isotropic turbulence has been performed. Direct numerical simulations (DNS) of this system were conducted using lattice Boltzmann method (LBM). The effects of hydrodynamics on the collision particles were accounted by directly resolving the flow around finite-size particles with an interpolated bounce-back scheme. A large-scale stochastic forcing scheme was implemented within the mesoscopic multiple-relaxation-time LBM approach to maintain turbulence intensity at targeted levels. Both kinematic and dynamic collision kernels were evaluated to study the correlation of total collision events and turbulent kinetic energy (TKE) dissipation rate. The results show that collisions between particles increase with the increase of TKE dissipation rate as radial relative velocities between particles increase with it. It is found that the dynamic collision kernels do not match with the kinematic collision kernels which is derived from point-particle method. Quantitatively, they were approximately 4 to 10 times smaller than the corresponding dynamic collision kernels. Therefore, it is not reasonable to estimate the kinematic collision kernel in particle-resolved simulations as its rationales are not valid. However, the collision behavior can still be accounted for by means of the dynamic collision kernel since it is obtained from the direct statistical analysis of the collision events.

Lattice Boltzmann method Multiphase flow Particle collisions Particle-resolved simulation

SCI ; EI

英语

通讯

Young Scholars Program of Shandong University[YSPSDU 31360088964058] ; National Natural Science Foundation of China[51906125] ; China Postdoctoral Science Foundation[2019M650162] ; Youth Interdisciplinary Science and Innovative Research Groups of Shandong University[2020QNQT014]

Engineering

Engineering, Chemical

WOS:000581916600008

ELSEVIER

20203309060144

Stochastic systems ; Kinematics ; Numerical models ; Turbulence ; Numerical methods ; Kinetic theory ; Energy dissipation ; Kinetics ; Particle size analysis ; Kinetic energy ; Spectrum analysis

Energy Losses (industrial and residential):525.4 ; Fluid Flow, General:631.1 ; Computer Applications:723.5 ; Control Systems:731.1 ; Mathematics:921 ; Numerical Methods:921.6 ; Classical Physics; Quantum Theory; Relativity:931 ; Mechanics:931.1 ; Materials Science:951 ; Systems Science:961

CHEMISTRY

2-s2.0-85089384346

Scopus

1.Key Laboratory of High-efficiency and Clean Mechanical Manufacture,School of Mechanical Engineering,Shandong University,Jinan,250061,China
2.SUSTech Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China

Chen，Songying,Chen，Xiaohang,Wan，Dongdong,et al. Particle-resolved direct numerical simulation of collisions of bidisperse inertial particles in a homogeneous isotropic turbulence[J]. POWDER TECHNOLOGY,2020,376:72-79.

Chen，Songying.,Chen，Xiaohang.,Wan，Dongdong.,Sun，Xun.,Ji，Li.,...&Wang，Guichao.(2020).Particle-resolved direct numerical simulation of collisions of bidisperse inertial particles in a homogeneous isotropic turbulence.POWDER TECHNOLOGY,376,72-79.

Chen，Songying,et al."Particle-resolved direct numerical simulation of collisions of bidisperse inertial particles in a homogeneous isotropic turbulence".POWDER TECHNOLOGY 376(2020):72-79.