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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
Том 46, 2019 Том 45, 2018 Том 44, 2017 Том 43, 2016 Том 42, 2015 Том 41, 2014 Том 40, 2013 Том 39, 2012 Том 38, 2011 Том 37, 2010 Том 36, 2009 Том 35, 2008 Том 34, 2007 Том 33, 2006 Том 32, 2005 Том 31, 2004 Том 30, 2003 Том 29, 2002 Том 28, 2001 Том 27, 2000 Том 26, 1999 Том 25, 1998 Том 24, 1997 Том 23, 1996 Том 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v38.i6.90
pages 565-571

Robo-Linked Purcell's Swimmer

M. Siva Kumar
Department of Physics, Indian School Muscat, The Sultanate of Oman
P. Philominathan
Department of Physics, AVVM Sri Pushpam College Tanjore , India

Краткое описание

EM Purcell proposed three-linked swimmer 60 years ago as a hypothetical creature capable of swimming in highly viscous fluid. We have constructed a scaled model of this swimmer to investigate reciprocal and non-reciprocal swimming motion. The links were programmatically rotated by the interactive servomotors controlled by a microcomputer. Reciprocal motion of the links produced no net displacement illustrating the effect of scallop theorem. Experiments on non-reciprocal motion captured very important property suggested by theories: small stroke angles cause forward swimming and large stroke angles backward. We have measured non-dimensional displacement per cycle and compared with the theoretical predictions and found consistent. Surprisingly, in low-frequency region, flapping frequency of the links also play a role in determining swimming direction. The low-Reynolds number swimming is characterised by Stokes equation which is linear and time-independent. But frequency dependence in low-frequency region shows the breakdown of Stokes law with inertia.


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