Abstract
Focusing on the evolution of wake structure in a flow around an impulsively stopped sphere in an incompressible viscous fluid with a streamwise magnetic field, a complicated vortex structure system containing a primary vortex ring, a fragmented secondary vortex, and an accompanying vortex is discussed, summarized in the {N, Re} phase diagram. The scaling laws of drag coefficient and peak azimuthal vorticity are given and their behaviors are investigated under the influence of a magnetic field.
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