Bénard-von Kármán vortex street in a Bose-Einstein condensate.
Vortex shedding from an obstacle potential moving in a Bose-Einstein condensate is investigated. Long-lived alternately aligned vortex pairs are found to form in the wake, which is similar to the Bénard-von Kármán vortex street in classical viscous fluids. Various patterns of vortex shedding are systematically studied and the drag force on the obstacle is calculated. It is shown that the phenomenon can be observed in a trapped system.
Sasaki
Kazuki
K
Department of Engineering Science, University of Electro-Communications, Tokyo 182-8585, Japan.
Suzuki
Naoya
N
Saito
Hiroki
H