期刊
SCIENTIFIC REPORTS
卷 4, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep05904
关键词
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资金
- NSF [CBET-0828749, CMMI-0941674, CBET-1066575, DGE-0903637, CTS-070056T, CTS-090006]
- Northwestern University High Performance Computing System - Quest
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1066575] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0941674] Funding Source: National Science Foundation
Nearly eighty years ago, Gray reported that the drag power experienced by a dolphin was larger than the estimated muscle power - this is termed as Gray's paradox. We provide a fluid mechanical perspective of this paradox. The viewpoint that swimmers necessarily spend muscle energy to overcome drag in the direction of swimming needs revision. For example, in undulatory swimming most of the muscle energy is directly expended to generate lateral undulations of the body, and the drag power is balanced not by the muscle power but by the thrust power. Depending on drag model utilized, the drag power may be greater than muscle power without being paradoxical.
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