Archivio Istituzionale della RicercaFlow around a submerged cylinder near a free surface reveals that adjusting the Froude number and gap ratio influences the underwater jet pattern, vortex shedding frequency and free-surface deformation. The jet typically separates near the trough, leading to vorticity concentration and breaking waves that dissipate wave energy. Antarctic orcas collaborate to generate deep depression waves, breaking ice and washing seals from floes. Orcas raise their heads and tap their tails downward when approaching ice, which may benefit strong wave generation. We investigate the wave-generating hydrodynamics using a towing tank and particle image velocimetry. A scaled model with an elliptical body and wedge-shaped tail was tested under Froude number similarity.
How orcas capture seals resting on ice floes / Zhou, Wenyuan; An, Jiale; Rondoni, Lamberto; Zhang, Yuliang; Ou, Zhaoyang; He, Yang; Yuan, Weizheng. - In: JOURNAL OF FLUID MECHANICS. - ISSN 0022-1120. - ELETTRONICO. - 1034:(2026), pp. 1-51. [10.1017/jfm.2026.11483]
How orcas capture seals resting on ice floes
Rondoni, Lamberto;
2026
Abstract
Flow around a submerged cylinder near a free surface reveals that adjusting the Froude number and gap ratio influences the underwater jet pattern, vortex shedding frequency and free-surface deformation. The jet typically separates near the trough, leading to vorticity concentration and breaking waves that dissipate wave energy. Antarctic orcas collaborate to generate deep depression waves, breaking ice and washing seals from floes. Orcas raise their heads and tap their tails downward when approaching ice, which may benefit strong wave generation. We investigate the wave-generating hydrodynamics using a towing tank and particle image velocimetry. A scaled model with an elliptical body and wedge-shaped tail was tested under Froude number similarity.
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ZhouAnRZhangOuHeYuan-HowOrcasCaptureSealsRestingOnIceFloes-JFluidMech2026.pdf
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JFM_Manuscript.pdf
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https://hdl.handle.net/11583/3010486