Characterization of the flow past a truncated square cylinder in a duct under a spanwise magnetic field
Characterization of the flow past a truncated square cylinder in a duct under a spanwise magnetic field
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展向磁场下流过管道中截断方形圆柱体的流动特性
DOI：
10.1017/jfm.2011.478
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发表时间：
2012
影响因子：
3.7
通讯作者：
A. Pothérat
中科院分区：
文献类型：
--
作者：
V. Dousset;A. Pothérat
我们研究在外部施加的沿圆柱轴定向的均匀磁场的影响下，导电流体在矩形管道中流过截头方形圆柱体的流动。我们的目1968 年，第 693–714 页）。后一种情况的特点是磁流体动力学领域中被称为亨特尾流的显着结构，其中流动在停滞区的两侧偏转，位于截断圆柱体的正上方，就好像截断圆柱体将跨越管道的整个高度一样。在洛伦兹力主导的稳定流中，惯性可以忽略不计，我们提供了亨特尾流的第一个数值流可视化。在有限惯性区域中，对稳定流动区域进行彻底的拓扑分析揭示了随着哈特曼数（给出磁场的无量纲测量）的增加，洛伦兹力如何逐渐重组圆柱体流体动力尾流中的流动结构。涡旋脱落的性质源于磁场对稳定结构的重新排列。随着增加，我们观察到涡街从强对称涡街变为非截断圆柱尾流典型的反向旋转涡流的交替行进。
We study the flow of an electrically conducting fluid past a truncated square cylinder in a rectangular duct under the influence of an externally applied homogeneous magnetic field oriented along the cylinder axis. Our aim is to bridge the gap between the non-magnetic regime, where we previously found a complex set of three-dimensional recirculations behind the cylinder (Dousset & Pothérat, J. Fluid Mech., vol. 653, 2010, pp. 519–536) and the asymptotic regime of dominating Lorentz force analysed by Hunt & Ludford (J. Fluid. Mech., vol. 33, 1968, pp. 693–714). The latter regime is characterized by a remarkable structure known as Hunt’s wake in the magnetohydrodynamics community, where the flow is deflected on either side of a stagnant zone, right above the truncated cylinder as if the latter would span the full height of the duct. In steady flows dominated by the Lorentz force, with negligible inertia, we provide the first numerical flow visualization of Hunt’s wake. In regimes of finite inertia, a thorough topological analysis of the steady flow regimes reveals how the Lorentz force gradually reorganizes the flow structures in the hydrodynamic wake of the cylinder as the Hartmann number (which gives a non-dimensional measure of the magnetic field) is increased. The nature of the vortex shedding follows from this rearrangement of the steady structures by the magnetic field. As is increased, we observe that the vortex street changes from a strongly symmetric one to the alternate procession of counter-rotating vortices typical of the non-truncated cylinder wakes.
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DOI：
--
发表时间：
1985
期刊：
影响因子：
--
作者：
M. Mond;P. Lykoudis;H. Branover
通讯作者：
H. Branover
影响因子：
1.7
作者：
L. Barleon;U. Burr;K. Mack;R. Stieglitz
通讯作者：
L. Barleon;U. Burr;K. Mack;R. Stieglitz
具有强横向磁场的三维 MHD 管道流第 1 部分：恒定面积通道中的障碍物
影响因子：
3.7
作者：
J. Hunt;G. Ludford
通讯作者：
G. Ludford
DOI：
10.1063/1.168744
发表时间：
1998-11-01
期刊：
COMPUTERS IN PHYSICS
影响因子：
--
作者：
Weller, HG;Tabor, G;Fureby, C
通讯作者：
Fureby, C