a stable perturbation in a fluid that takes the form of a torus in which the flow rotates in the section of the torus so that the pressure difference between the inside and outside of the torus balances body forces. The best-known vortex ring is a smoke ring
Examples of 'vortex ring' in a sentence
vortex ring
Besides, the vortex ring itself induces an axial velocity.
Peter F. Pelz, Paul Taubert, Ferdinand-J. Cloos 2018, 'Vortex Structure and Kinematics of Encased Axial Turbomachines', International Journal of Turbomachinery, Propulsion and Powerhttp://www.mdpi.com/2504-186X/3/2/11. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The circulation of the primary vortex ring reasonably elucidates some typical phases of flow evolution.
Heng Ren, Changyue Xu 2014, 'Three-dimensional numerical simulation of a vortex ring impacting a bump', Theoretical and Applied Mechanics Lettershttp://www.sciencedirect.com/science/article/pii/S2095034915303135. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
These jets are formed between undulating vortices and inside of the vortex ring.
Longfei Zhao, Sergey Shkarayev, Erlong Su 2018, 'Aerodynamics of a Wing with a Wingtip Flapper', Fluidshttp://www.mdpi.com/2311-5521/3/2/29. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The vortex ring sheds from the flapper during the second half of the upstroke and pronation.
Longfei Zhao, Sergey Shkarayev, Erlong Su 2018, 'Aerodynamics of a Wing with a Wingtip Flapper', Fluidshttp://www.mdpi.com/2311-5521/3/2/29. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The results show that the frequency band depends on the initial size of the vortex ring and its helicity.
Fedor V. Shugaev, Dmitri Y. Cherkasov, Oxana A. Solenaya 2015, 'Acoustic Radiation by 3D Vortex Rings in Air', Aerospace (Basel)http://www.mdpi.com/2226-4310/2/4/627. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)