@article{oai:u-ryukyu.repo.nii.ac.jp:02001602,
 author = {Nagai, Minoru and Ameku, Kazumasa and 永井, 實 and 天久, 和正},
 issue = {66},
 journal = {琉球大学工学部紀要},
 month = {Mar},
 note = {To examine the engineering application of an artificial vortex ring, the induced velocity field around a vortex ring has been studied with the potential flow theory. As results, since the induced velocity becomes zero far apart from the vortex ring, the ring does not move by its own induced flow field. In other words, a vortex ring does not necessarily move at the speed as usually it might have been misunderstood.\nIn this paper, the flow field induced by a vortex ring and then superimposing various strength uniform flows on the field are calculated and discussed. This paper also clears that two parallel straight vortex lines neighboring to each other do not necessarily rotate or go parallel with the velocities, which may have been misunderstood for longtime., 紀要論文},
 pages = {1--5},
 title = {On the Motion of a Vortex Ring and a Vortex Pair : Have we had a centurial misunderstanding?},
 year = {2004}
}