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Particulate turbulent flows are encountered in many natural and industrial situations. In the present study, we examine the dynamics of homogeneous shear turbulence laden with spherical finite-size particles by the use of fully resolved direct numerical simulations in order to understand how the presence of particles modulates turbulence. We focus on the situation where the particle diameter is a few times larger than that of the vortex core in turbulence. An immersed boundary method is adopted to represent the spherical finite-size particle. Numerical results show that the particles activate the generation of longitudinal vortex tubes leading to the formation of the clusters of vortex tubes in zero-gravity situation. In finite gravity, the particles also cause the breakdown of vortex tubes and the clusters of vortex tubes are less noticeable.
Author(s):
Mitsuru Tanaka
Kyoto Institute of Technology
Japan
Takayuki Wazaki
Kyoto Institute of Technology
Japan