Abstract
Controlling the wake vortex dynamics of bluff bodies efficiently is a fundamental problem in many applications. Earlier direct numerical simulations (Darekar and Sherwin) of three-dimensional bluff bodies demonstrated that the introduction of a spanwise waviness at both the leading and trailing surfaces suppresses the vortex shedding and reduces the amplitude of the fluctuating aerodynamic forces. Under this motivation, starting from a fully developed shedding, a sufficiently high spanwise forcing is introduced on the surface of the cylinder, in the regions where separation effects occur, resulting in the stabilisation of the near wake in a time-independent state, similar to the effect of a sinusoidal stagnation surface. Stability analysis of the linearised Navier-Stokes equations was then performed on the three-dimensional flows to investigate the role of the spanwise modulation on the absolute instability associated with the von Kármán street.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Barkley D, Blackburn HM, Sherwin SJ (2008) Direct optimal growth analysis for time-stepper. Int J Numer Meth Fluids 57:1435–1458
Bearman PW (1967) The effect of base bleed on the flow behind a two-dimensional model with a blunt trailing edge. Aeronaut Q 18:207–224
Choi H, Jeon WP, Kim J (2007) Control of flow over a bluff body. Ann Rev Fluid Mech 40:113–139
Darekar RM, Sherwin SJ (2001) Flow past a square-section cylinder with wavy stagnation face. J Fluid Mech 426:263–295
Giannetti F, Luchini P (2007) Structural sensitivity of the first instability of the cylinder wake. J Fluid Mech 581:167–197
Hwang Y, Kim J, Choi H (2013) Stabilization of absolute instability in spanwise wavy two-dimensional wakes. J Fluid Mech 727:346–378
Kim J, Choi H (2005) Distributed forcing of flow over circular cylinder. Phys Fluids 17 :033103
Karniadakis GE, Israeli M, Orszag SA (1991) High-order splitting methods for the incompressible Navier-Stokes equations. J Comp Phys 97:414–443
Theofilis V (2011) Global linear Instability. Ann Rev Fluid Mech 43:319–352
Wood CJ (1964) The effect of base bleed on a periodic wake. J R Aeronaut Soc 68:477–482
Acknowledgments
G.R. wishes to acknowledge support from UK EPSRC grant EP/H050507/1 “Advanced Instability Methods”. S.J.S. would like to acknowledge support from the McLaren Racing/Royal Academy of Engineering Research Chair.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2015 Springer International Publishing Switzerland
About this paper
Cite this paper
Rocco, G., Sherwin, S.J. (2015). The Role of Spanwise Forcing on Vortex Shedding Suppression in a Flow Past a Cylinder. In: Theofilis, V., Soria, J. (eds) Instability and Control of Massively Separated Flows. Fluid Mechanics and Its Applications, vol 107. Springer, Cham. https://doi.org/10.1007/978-3-319-06260-0_15
Download citation
DOI: https://doi.org/10.1007/978-3-319-06260-0_15
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-06259-4
Online ISBN: 978-3-319-06260-0
eBook Packages: EngineeringEngineering (R0)