Vortices as Brownian particles in turbulent flows

Chong, Kai Leong1; Shi, Jun-Qiang2; Ding, Guang-Yu1,3,4; Ding, Shan-Shan2; Lu, Hao-Yuan2; Zhong, Jin-Qiang2; Xia, Ke-Qing1,3,4

2020-08

10.1126/sciadv.aaz1110

Science Advances   影响因子和分区

2375-2548

Brownian motion of particles in fluid is the most common form of collective behavior in physical and biological systems. Here, we demonstrate through both experiment and numerical simulation that the movement of vortices in a rotating turbulent convective flow resembles that of inertial Brownian particles, i.e., they initially move ballistically and then diffusively after certain critical time. Moreover, the transition from ballistic to diffusive behaviors is direct, as predicted by Langevin, without first going through the hydrodynamic memory regime. The transitional timescale and the diffusivity of the vortices can be collapsed excellently onto a master curve for all explored parameters. In the spatial domain, however, the vortices exhibit organized structures, as if they are performing tethered random motion. Our results imply that the convective vortices have inertia-induced memory such that their short-term movement can be predicted and their motion can be well described in the framework of Brownian motions.

SCI ; EI

英语

NI论文

通讯

Hong Kong Research Grants Council[14301115][14302317] ; NSFC/RGC Joint Research grant[N_CUHK437/15][11561161004] ; National Science Foundation of China[11572230][11772235]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000561426700004

AMER ASSOC ADVANCEMENT SCIENCE

20203909245074

Brownian movement

Fluid Flow, General:631.1 ; Colloid Chemistry:801.3

Web of Science

1.Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
2.Tongji Univ, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China
3.Southern Univ Sci & Technol, Ctr Complex Flows & Soft Matter Res, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China

Chong, Kai Leong,Shi, Jun-Qiang,Ding, Guang-Yu,et al. Vortices as Brownian particles in turbulent flows[J]. Science Advances,2020,6(34).

Chong, Kai Leong.,Shi, Jun-Qiang.,Ding, Guang-Yu.,Ding, Shan-Shan.,Lu, Hao-Yuan.,...&Xia, Ke-Qing.(2020).Vortices as Brownian particles in turbulent flows.Science Advances,6(34).

Chong, Kai Leong,et al."Vortices as Brownian particles in turbulent flows".Science Advances 6.34(2020).