TY - JOUR
T1 - Direct Numerical Simulation of Particle-laden Flow around an Obstacle at Different Reynolds Numbers
AU - Lin, Shengxiang
AU - Xia, Huanxiong
AU - Zhang, Zhenyu
AU - Liu, Jianhua
AU - Wang, Honglei
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2021/4/19
Y1 - 2021/4/19
N2 - Inspired by the practical operation of the fluid machineries, direct numerical simulation of fluid with a lot of finite-size particles flowing around a large-size obstacle at three different Reynolds numbers is implemented by using a two-way coupled finite-volume, discrete-element and immersed-boundary method. The results show that, for a low Reynolds number Re=20, the flow is dominated by viscosity, and under the circumstances of a small Stokes number, the particles follow fluid streamlines closely. The flow suggests regular movement characteristics of laminar flow, although the vortices behind the obstacle tend to collapse under the perturbation of particles. For a moderate Reynolds number Re=100, the phenomenon of vortex shedding is also observed. Due to the centrifugal force induced by the vortices, particles are distributed around the main vortices behind the obstacle, forming particle-free zones in these vortices. For a high Reynolds number Re=300, the flow is chaotic. The vortices of many sizes appear irregularly in the domain and the distribution of particles tends to be uniform.
AB - Inspired by the practical operation of the fluid machineries, direct numerical simulation of fluid with a lot of finite-size particles flowing around a large-size obstacle at three different Reynolds numbers is implemented by using a two-way coupled finite-volume, discrete-element and immersed-boundary method. The results show that, for a low Reynolds number Re=20, the flow is dominated by viscosity, and under the circumstances of a small Stokes number, the particles follow fluid streamlines closely. The flow suggests regular movement characteristics of laminar flow, although the vortices behind the obstacle tend to collapse under the perturbation of particles. For a moderate Reynolds number Re=100, the phenomenon of vortex shedding is also observed. Due to the centrifugal force induced by the vortices, particles are distributed around the main vortices behind the obstacle, forming particle-free zones in these vortices. For a high Reynolds number Re=300, the flow is chaotic. The vortices of many sizes appear irregularly in the domain and the distribution of particles tends to be uniform.
UR - http://www.scopus.com/inward/record.url?scp=85104889083&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/1877/1/012035
DO - 10.1088/1742-6596/1877/1/012035
M3 - Conference article
AN - SCOPUS:85104889083
SN - 1742-6588
VL - 1877
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012035
T2 - 4th International Conference on Aeronautical, Aerospace and Mechanical Engineering, AAME 2021
Y2 - 26 February 2021 through 28 February 2021
ER -