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On energy transfer in flow around a row of transversely oscillating square cylinders at low Reynolds number

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Title On energy transfer in flow around a row of transversely oscillating square cylinders at low Reynolds number
 
Creator SEWATKAR, CM
SHARMA, A
AGRAWAL, A
 
Subject Multiple cylinders
Wake interaction
Lattice Boltzmann method
Computational fluid dynamics
Flow map
WAKES
ARRAYS
BARS
TRANSITIONS
DOWNSTREAM
VIBRATIONS
SIMULATION
FORCES
 
Description In this paper, the effects of cylinder spacing, cylinder oscillation frequency, amplitude of cylinder oscillations and Reynolds number on the ensuing flow regimes and energy transition for flow across a row of transversely oscillating cylinders have been studied numerically using the lattice Boltzmann method. The lift and drag coefficient signals are analyzed in detail for finding the extent of lock-on regime and wake interaction mechanism at different spacings. It is noticed that the magnitude of the mean drag coefficient is large at small spacings, which is consistent with a strong wake interaction at small spacings. The effect of wake interaction can also be noticed from the non-monotonic variation of rms lift. The average energy transfer per cylinder oscillation cycle is large when the cylinders oscillate with a frequency near to the natural vortex shedding frequency. The direction of energy transfer changes between positive and negative values with small changes in the cylinder oscillation frequency, suggesting that the direction of energy transfer is very sensitive to this parameter. It is shown that the instantaneous lift coefficient and the cylinder velocity govern the energy transfer from or to the fluid. While the different parameters affect the flow regimes, the cylinder oscillation frequency primarily governs the energy transfer. (c) 2012 Elsevier Ltd. All rights reserved.
 
Publisher ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
 
Date 2014-10-15T08:40:59Z
2014-10-15T08:40:59Z
2012
 
Type Article
 
Identifier JOURNAL OF FLUIDS AND STRUCTURES, 311-17
http://dx.doi.org/10.1016/j.jfluidstructs.2012.03.002
http://dspace.library.iitb.ac.in/jspui/handle/100/14708
 
Language en