On the atmosphere of a moving body

Johan Rønby Pedersen, Hassan Aref

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearch


We have explored whether a rigid body moving freely with no circulation around it in a two-dimensional ideal fluid can carry a fluid ``atmosphere'' with it in its motion. Somewhat surprisingly, the answer appears to be ``yes''. When the body is elongated and the motion is dominated by rotation, we demonstrate numerically that, indeed, regions of fluid follow the body in its motion. Since there is a double-island structure for the case of pure rotation, as already found by Morton and Darwin many years ago, we see the existence of an atmosphere for the moving body as an example of the stability of Kolmogorov-Arnold-Moser tori. Our observations were reported in {\it Physics of Fluids} {\bf 22} (2010) 057103. The presentation will include animations not published with the paper and some indications of further work.
Original languageEnglish
Title of host publicationBulletin of the American Physical Society
Publication date2010
Publication statusPublished - 2010
Event63rd Annual Meeting, American Physical Society, Division of Fluid Dynamics - Long Beach, United States
Duration: 21 Nov 201023 Nov 2010
Conference number: 63


Conference63rd Annual Meeting, American Physical Society, Division of Fluid Dynamics
Country/TerritoryUnited States
CityLong Beach


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