| Anomalous hydrodynamic drafting of interacting flapping flags. | |
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MedLine Citation:
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PMID: 19113271 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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In aggregates of objects moving through a fluid, bodies downstream of a leader generally experience reduced drag force. This conventional drafting holds for objects of fixed shape, but interactions of deformable bodies in a flow are poorly understood, as in schools of fish. In our experiments on "schooling" flapping flags, we find that it is the leader of a group who enjoys a significant drag reduction (of up to 50%), while the downstream flag suffers a drag increase. This counterintuitive inverted drag relationship is rationalized by dissecting the mutual influence of shape and flow in determining drag. Inverted drafting has never been observed with rigid bodies, apparently due to the inability to deform in response to the altered flow field of neighbors. |
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Authors:
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Leif Ristroph; Jun Zhang |
Publication Detail:
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Type: Journal Article Date: 2008-11-03 |
Journal Detail:
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Title: Physical review letters Volume: 101 ISSN: 0031-9007 ISO Abbreviation: Phys. Rev. Lett. Publication Date: 2008 Nov |
Date Detail:
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Created Date: 2008-12-30 Completed Date: 2009-01-13 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401141 Medline TA: Phys Rev Lett Country: United States |
Other Details:
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Languages: eng Pagination: 194502 Citation Subset: - |
Affiliation:
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Department of Physics, Cornell University, Ithaca, New York 14853, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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