Effects of strong fringing magnetic fields on turbulent thermal convection

被引:4
|
作者
Bhattacharya, Shashwat [1 ]
Boeck, Thomas [1 ]
Krasnov, Dmitry [1 ]
Schumacher, Joerg [1 ]
机构
[1] Tech Univ Ilmenau, Inst Thermodynam & Fluid Mech, POB 100565, D-98684 Ilmenau, Germany
关键词
Benard convection; magneto convection; RAYLEIGH-BENARD CONVECTION; DIRECT NUMERICAL-SIMULATION; QUASI-STATIC MAGNETOCONVECTION; LIQUID-METAL LAYERS; HEAT-TRANSFER; ROTATING CYLINDER; LINEAR-THEORY; FLOW; STABILITY; MODES;
D O I
10.1017/jfm.2023.364
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
We study the influence of fringing magnetic fields on turbulent thermal convection in a horizontally extended rectangular domain. The magnetic field is created in the gap between two semi-infinite planar magnetic poles, with the convection layer located near the edge of the gap. We employ direct numerical simulations in this set-up for fixed Rayleigh and small Prandtl numbers, but vary the fringe width by controlling the gap between the magnetic poles and the convection cell. The magnetic field generated by the magnets is strong enough to cease the flow in the high magnetic flux region of the convection cell. We observe that as the local vertical magnetic field strength increases, the large-scale structures become thinner and align themselves perpendicular to the longitudinal sidewalls. We determine the local Nusselt and Reynolds numbers as functions of the local Hartmann number (based on the vertical component of the magnetic field), and estimate the global heat and momentum transport. We show that the global heat transport decreases with increasing fringe width for strong magnetic fields but increases with increasing fringe width for weak magnetic fields. In the regions of large vertical magnetic fields, the convective motion becomes confined to the vicinity of the sidewalls. The amplitudes of these wall modes show a non-monotonic dependence on the fringe width.
引用
收藏
页数:29
相关论文
共 50 条
  • [31] Supergravitational turbulent thermal convection
    Jiang, Hechuan
    Zhu, Xiaojue
    Wang, Dongpu
    Huisman, Sander G.
    Sun, Chao
    SCIENCE ADVANCES, 2020, 6 (40):
  • [32] Effects of rotation on temperature fluctuations in turbulent thermal convection on a hemisphere
    T. Meuel
    M. Coudert
    P. Fischer
    C. H. Bruneau
    H. Kellay
    Scientific Reports, 8
  • [33] THERMAL STRUCTURE OF TURBULENT CONVECTION
    CARROLL, JJ
    JOURNAL OF THE ATMOSPHERIC SCIENCES, 1976, 33 (04) : 642 - 659
  • [34] Numerical study of Prandtl number effects in turbulent thermal convection
    Bao Yun
    Gao Zhen-Yuan
    Ye Meng-Xiang
    ACTA PHYSICA SINICA, 2018, 67 (01)
  • [35] Effects of rotation on temperature fluctuations in turbulent thermal convection on a hemisphere
    Meuel, T.
    Coudert, M.
    Fischer, P.
    Bruneau, C. H.
    Kellay, H.
    SCIENTIFIC REPORTS, 2018, 8
  • [36] Ultimate turbulent thermal convection
    Lohse, Detlef
    Shishkina, Olga
    PHYSICS TODAY, 2023, 76 (11) : 26 - 32
  • [37] Small-scale magnetic buoyancy and magnetic pumping effects in a turbulent convection
    Rogachevskii, Igor
    Kleeorin, Nathan
    GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS, 2006, 100 (03): : 243 - 263
  • [38] Mean flow instabilities of two-dimensional convection in strong magnetic fields
    Rucklidge, A. M.
    Proctor, M. R. E.
    Prat, J.
    GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS, 2006, 100 (02): : 121 - 137
  • [39] TURBULENT RAYLEIGH-BENARD CONVECTION IN A CONDUCTING FLUID IN A STRONG MAGNETIC-FIELD
    BHATTACHARJEE, JK
    DAS, A
    BANERJEE, K
    PHYSICAL REVIEW A, 1991, 43 (02): : 1097 - 1099
  • [40] ON THE DISPLACEMENT OF AN ION BEAM IMAGE BY MAGNETIC FRINGING FIELDS
    KERWIN, L
    CANADIAN JOURNAL OF PHYSICS, 1958, 36 (06) : 711 - 720