Stabilizing a Laminar Flow over a Rectangular Cylinder using Two Small Rotating Cylinders

Document Type : Regular Article

Authors

Faculty of Engineering, Bu-Ali Sina University, Hamedan, 65174, Iran

Abstract

The possibility of suppressing laminar vortex shedding after a rectangular cylinder with a pair of rotating controllers has been investigated for Re=150. Drag and lift coefficients of the rectangular cylinder have been measured at different positions of the controller system. Numerical results show that the controller system suppresses the vortex shedding completely when installing at some suitable positions. It was found that the controller system affects the vorticity intensity in the separation bubbles at these suitable positions. The controller system may completely eliminate the separation bubble or may make them remain in attached to the cylinder. Besides, the effectiveness sensitivity of the controller system to its rotation rate and Reynolds number was analyzed when installing at the edge of the cylinder boundary layer where its position is denoted by (r/a=2,q=40o). These analyses show that the controller system can still suppress the laminar vortex shedding completely when the rotation rate of the controller system and Reynolds number of the incoming flow change by less than 50%.

Keywords


Badr, H. M., S. C. R. Dennis and P. J. S. Young (1989). Steady and unsteady flow past a rotating circular cylinder at low Reynolds numbers. Computers and Fluids 17)4(, 579–609.##
Brocchini, M. and F. Trivellato (2006). Vorticity and turbulence effects in fluid structure interaction, an application to hydraulic structure design, WIT Press, ISBN:1-84564-052-7.##
Chen, W., H. Hu and H. Li (2013). Suppression of vortex shedding from a circular cylinder by using a suction flow control method, AIAA, 0103.##
Chen, J. C. and P. S. Chuan (2013). Suppression of vortex shedding from a rectangular cylinder at low Reynolds numbers. Journal of Fluids and Structures 43, 15–27.##
Dipankar, A., T. K. Sengupta and S. B. Talla (2006). Suppression of vortex shedding behind a circular cylinder by another control cylinder at low Reynolds numbers. Journal of Fluid Mechanics, 1–20.##
Fox, M. D., P. J. Pritchard and J. C. Leylegian (2011). Introduction to fluid mechanics, 8th ed., John Wiley & Sons Inc., ISBN: 0470547553.##
Goodarzi, M. and E. Khalili Dehkordi (2017). Geometrical parameter analysis on stabilizing the flow regime over a circular cylinder using two small rotating controllers. Computers and Fluids 145, 129–140.##
Khalili Dehkordi, E., M. Goodarzi and S. H. Nourbakhsh (2018). Optimal active control of laminar flow over a circular cylinder using Taguchi and ANN. European Journal of Mechanics B/Fluids 67, 104-115.##
Maurel, A. and P. Petitjeans (1999). Vortex structure and dynamics. lectures of a workshop held in Rouen, Springer, France.##
Mittal, S. (2001). Control of flow past bluff bodies using rotating control cylinders. Journal of Fluids and Structures 15, 291–326.##
Mittal, S. and A. Raghuvanshi (2001). Control of vortex shedding behind circular cylinder for flows at low Reynolds umbers. International Journal of Numerical Methods in Fluids 35, 421–447.##
Mittal, S. and B. Kumar (2003). Flow past a rotating cylinder. Journal of Fluid Mechanics 476, 303–334.##
Muddada, S. and B. S. V. Patnaik (2010). An active flow control strategy for the suppression of vortex structures behind a circular cylinder. European Journal of Mechanics B/Fluids 29, 93–104.##
Park, H., D. Lee, W. P. Jeon, S. Hahn and J. Kim (2006). Drag reduction in flow over a two-dimensional bluff body with a blunt trailing edge using a new passive device. Journal of Fluid Mechanics 563, 389–414.##
Patankar, S. (1980). Numerical heat transfer and fluid flow. Hemisphere Pub Co, Mc- Graw Hill.##
Pralits, J. O., L. Brandt and F. Giannetti, (2010). Instability and sensitivity of the flow around a rotating circular cylinder. Journal of Fluid Mechanics, 1–24.##
Rashidi, S., M. Hayatdavoodi and J. A. Esfahani (2016). Vortex shedding suppression and wake control: a review. Ocean Engineering 129, 57–80.##
Sharma, A. and V. Eswaran (2004). Heat and fluid flow across a square cylinder in the two- dimensional laminar flow regime. Numerical Heat Transfer 45, 247- 269.##
Sheng, W. J., X. Y. Xin and T. Y. Sheng (2013). Active control of circular cylinder flow by affiliated rotating cylinders. Society of China Technology Science 56, 1187–1197.##
Shimizu, Y. and Y. Tanida (1987). Fluid forces acting on cylinders of rectangular cross- section. Transaction Japan Society of Mechanical Engineering B 44, 2699–2706.##
Shtendel, T. and A. Seifert (2014). Three-dimensional aspects of cylinder drag reduction by suction and oscillatory blowing. International Journal of Heat Fluid Flows 45, 109–127.##
Sohankar, A., C. Norberg and L. Davidson (1998). Low-Reynolds-number flow around a square cylinder at incidence: study of blockage, onset of vortex shedding and outlet boundary condition. International Journal of Numerical Methods in Fluids 26, 39-56.##
Sohankar, A., M. Khodadian and E. Rangraz (2015). Control of fluid flow and heat transfer around a square cylinder by uniform suction and blowing at low Reynolds numbers. Computers and Fluids 109, 155-167.##
Sumer, B. M. and J. Fredsoe (2006). Hydrodynamics around cylindrical structures, In revised (Ed.), Advanced series on ocean engineering 26. World Scientific Publishing Company.##
Tropea, C., A. L. Yarin and J. F. Foss (2007). Springer handbook of experimental fluid mechanics, Printing and Binding, Sturtz GmbH.##
White, F.M. (2010). Fluid mechanics, Fourth ed., WCB McGraw-Hill.##
Williamson, C. H. K. (1989). Oblique and parallel modes of vortex shedding in the wake of a circular cylinder at low Reynolds numbers. Journal of Fluid Mechanics 206, 579–627.##
Zdravkovich, M. M. (1990). Conceptual overview of laminar and turbulent flows past smooth and rough circular cylinders. Journal of Wind Engineering and Industrial Aerodynamics 33, 53–62.##
Volume 15, Issue 1 - Serial Number 63
January and February 2022
Pages 169-178
  • Received: 19 April 2021
  • Revised: 25 August 2021
  • Accepted: 01 September 2021
  • Available online: 14 November 2021