Spatial evolution of a quasi-two-dimensional Karman vortex street subjected to a strong uniform magnetic field

A vortex decay model for predicting spatial evolution of peak vorticity in a wake behind a cylinder is presented. For wake vortices in the stable region behind the formation region, results have shown that the presented model has a good capability of predicting spatial evolution of peak vorticity within an advecting vortex across 0.1 <= beta <= 0.4, 500 <= H <= 5000, and 1500 <= Re-L <= 8250. The model is also generalized to predict the decay behaviour of wake vortices in a class of quasi- two- dimensional magnetohydrodynamic duct flows. Comparison with published data demonstrates remarkable consistency. (C) 2015 AIP Publishing LLC.