An Axisymmetric Viscous Vortex Motion and Its Acoustic Emission

概要

論文の詳細を見る
Numerical simulation of head-on collision of two vortex rings has been madefor various values of a translation Reynolds number from 50 to 500, and theprofile of the acoustic wave emitted by the vortex collision is determined by usingthe computed development of the stream function and vorticity distributions.It is found for the higher Reynolds number range that there is an early stageduring which the strength of each vortex is conserved, however, the strengthdecreases rapidly from an instant when the cores of the two vortices come intocontact. The total kinetic energy decreases similarly. The enhancement of theenergy dissipation is found to be related to the vortex stretching at the time ofcollision. The wave pressure is composed of two components, and comparisonwith experimental datx obtained at much higher Reynolds numbers indicatesreasonable agreement for the main quadrupole component.
社団法人日本物理学会の論文
1984-07-15