机构:
Univ Alabama, Ctr Space Plasma & Aeron Res CSPAR, Huntsville, AL 35899 USA
Univ Alabama, Dept Space Sci, Huntsville, AL 35899 USAUniv Calabria, Inst Atmospher Pollut Res, CNR, I-87036 Arcavacata Di Rende, Italy
Zank, Gary
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Sorriso-Valvo, Luca
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Swedish Inst Space Phys, Angstrom Lab, Lagerhyddsvagen 1, SE-75121 Uppsala, Sweden
CNR, Ist Sci & Tecnol Plasmi, Via Amendola 122-D, I-70126 Bari, ItalyUniv Calabria, Inst Atmospher Pollut Res, CNR, I-87036 Arcavacata Di Rende, Italy
The chaotic advection of fluid particle pairs is investigated though a low-order model of two-dimensional magnetohydrodynamic (MHD), where only five nonlinearly interacting modes are retained. The model is inthrinsically inhomogeneous and anisotropic because of the influence of large-scale fluctuations. Therefore, even though dynamically chaotic, the fields are unable to form the typical scaling laws of fully developed turbulence. Results show that a super-ballistic dynamics, reminiscent of the Richardson law of particle-pairs diffusion in turbulent flows, is robustly obtained using the truncated model. Indeed, even in the strongly reduced truncation presented here, particle diffusion in MHD turbulence has the same laws as the separation of velocity of particle pairs. The inherent anisotropy only affects the scaling of diffusivity, by enhancing the diffusion properties along one direction for small time-scales. Finally, when further anisotropy is introduced in the system through Alfven waves, fluid particles are trapped by these, and super-ballistic diffusion is replaced by Brownian-like diffusion. On the other hand, when the magnetic field is removed, the kinetic counterpart of the model does not show super-ballistic dynamics. Copyright (C) 2022 EPLA
机构:
South China Agr Univ, Coll Elect Engn, Guangzhou 510642, Guangdong, Peoples R ChinaSouth China Agr Univ, Coll Elect Engn, Guangzhou 510642, Guangdong, Peoples R China
Wang, Xianju
Wu, Zuping
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South China Agr Univ, Coll Elect Engn, Guangzhou 510642, Guangdong, Peoples R ChinaSouth China Agr Univ, Coll Elect Engn, Guangzhou 510642, Guangdong, Peoples R China
Wu, Zuping
Lao, Meimei
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South China Agr Univ, Ctr Expt Teaching Common Basic Courses, Guangzhou 510642, Guangdong, Peoples R ChinaSouth China Agr Univ, Coll Elect Engn, Guangzhou 510642, Guangdong, Peoples R China
机构:
Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R ChinaXi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
Li, Min
Liu, Haihu
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Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R ChinaXi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
Liu, Haihu
Zhang, Yang
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Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R ChinaXi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
Zhang, Yang
Jia, Pan
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机构:
Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R ChinaXi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
Jia, Pan
Feng, Peihua
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机构:
Xi An Jiao Tong Univ, Sch Aerosp Engn, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R ChinaXi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
Feng, Peihua
Yang, Bin
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机构:
Northwest Univ, Sch Chem Engn, Xian 710069, Peoples R ChinaXi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
机构:
Jozef Stefan Inst, Jamova 39, SI-1000 Ljubljana, SloveniaJozef Stefan Inst, Jamova 39, SI-1000 Ljubljana, Slovenia
Ulaga, Martin
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机构:
Mravlje, Jernej
Kokalj, Jure
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机构:
Jozef Stefan Inst, Jamova 39, SI-1000 Ljubljana, Slovenia
Univ Ljubljana, Fac Civil & Geodet Engn, Jamova 2, Ljubljana, SloveniaJozef Stefan Inst, Jamova 39, SI-1000 Ljubljana, Slovenia
机构:
Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R ChinaHong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
Su, Yun
Ma, Xiao-guang
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Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R ChinaHong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
Ma, Xiao-guang
Lai, Pik-Yin
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机构:
Natl Cent Univ, Dept Phys, Taoyuan 320, Taiwan
Natl Cent Univ, Ctr Complex Syst, Taoyuan 320, TaiwanHong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
Lai, Pik-Yin
Tong, Penger
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机构:
Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R ChinaHong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
机构:
Jozef Stefan Inst, Jamova 39, Ljubljana 1000, SloveniaJozef Stefan Inst, Jamova 39, Ljubljana 1000, Slovenia
Ulaga, Martin
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Mravlje, Jernej
Prelovsek, Peter
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机构:
Jozef Stefan Inst, Jamova 39, Ljubljana 1000, SloveniaJozef Stefan Inst, Jamova 39, Ljubljana 1000, Slovenia
Prelovsek, Peter
Kokalj, Jure
论文数: 0引用数: 0
h-index: 0
机构:
Jozef Stefan Inst, Jamova 39, Ljubljana 1000, Slovenia
Univ Ljubljana, Fac Civil & Geodet Engn, Jamova 2, Ljubljana 1000, SloveniaJozef Stefan Inst, Jamova 39, Ljubljana 1000, Slovenia