Experimental investigation for wake of the circular cylinder by attaching different number of tripping wires

Document Type : Research Paper


1 Hakim Sabzevari University

2 Hakim Sabzevari University, Sabzevar


An experimental study is conducted on flow past a circular cylinder fitted with some tripping wires on its surface. The work investigates the dependency of the critical wire locations on the wire size and Reynolds numbers, and examines the wake and vortex shedding characteristics in an effort to advance the understanding of the critical wire effects beyond the existing literature. The primary aim of this investigation is to assess the significance of the angular locations of the surface trip wire. The wire size is 1.5 mm (wire_ to_ cylinder diameter ratio is 0.075), where in different angular locations attached in to the cylinder (by different number of trip wires, 2, 4, 6, 8, 10) and two Reynolds numbers (Re=10000 and Re=35000). Particularly, positioning the tripping wires at 45˚ (with 4 trip wires) maximally decreased the drag coefficients by 41.6% and 70.6% (Re=10000 and Re=35000, respectively), in comparison with the coefficients produced without the tripping wires. The variations of the Strouhal number is found to be, roughly, inversely related with drag coefficient.


[1] Paranthoën, P., and Browne, L. B., "Characteristics of the Near Wake of a Cylinder at Low Reynolds Numbers", European Journal of Mechanics - B/Fluids, Vol. 18, No. 4, pp. 659–674, (1999).
[2] Kuo, C. H., Chiou, L. C., and Chen, C. C., "Wake Flow Pattern Modified by Small Control Cylinders at Low Reynolds Number", Journal of Fluids and Structures, Vol. 23, No. 6. pp. 938–956, (2007).
[3] Rehimi, F., Aloui, F., Nasrallah, S. B., Doubliez, L., and Legrand, J., "Experimental Investigation of a Confined Flow Downstream of a Circular Cylinder Centered between Two Parallel Walls", Journal of Fluids and Structures, Vol. 24, No. 6 pp. 855–882, (2008).
[4] Araújo, T. B., Sicot, C., Boree, J., and Martinuzzi, R. J., "Influence of Obstacle Aspect Ratio on Tripped Cylinder Wakes", International Journal of Heat and Fluid Flow, Vol. 35, pp. 109–118, (2012).
[5] Nagao, F., Noda, M., Inoue, M., and Matsukawa, S. "Propertice of Wake Excitation in Tandem Circular Cylinders with Several Kinds of Surface Roughness", the Seventh International Colloquium on Bluff Body Aerodynamics and Applications (BBAA7), Shanghai, China, (2012).
[6] Aydin, T. B., Joshi, A., and Ekmekci, A., "Critical Effects of a Spanwise Surface Wire on Flow Past a Circular Cylinder and the Significance of the Wire Size and Reynolds Number", Journal of Fluids and Structures, Vol. 51, pp. 132–147, (2014).
[7] Diebold, J. M., and Bragg, M. B., "Study of a Swept Wing with Leading-edge Ice using a Wake Survey Technique", 51st AIAA Aerospace Sciences Meeting, Texas, (2013).
[8] Wang, X. K., and Tan, S. K., "Comparison of Flow Patterns in the Near Wake of a Circular Cylinder and a Square Cylinder Placed Near a Plane Wall", Ocean Engineering, Vol. 35, No. 5-6, pp. 458–472, (2008).
[9] Khoshnevis, A. B., Vahidi, M., and Pedram, M., "Experimental Study for Drag Reduction about Circular Cylinder by Ataching Trip Wire", J. Fluid Dynamics, Vol. 2, No. 2, (2011). (in Persian)
[10] Igarishi, T., and Tsutsui, T., "Flow Control around a Circular Cylinder by a Small Cylinder", 11th Australasian Fluid Mechanics Conference, University of Tasmania, Hobart, Australia, (1992).
[11] Hover, F. S., Tvedt, H., and Triantafyllou, M. S., "Vortex-induced Vibrations of a Cylinder with Tripping Wires", Journal of Fluid Mechanics, Vol. 448, pp. 175-195, (2001).
[12] Ekmekci, A., and Rockwell, D., "Control of Flow Past a Circular Cylinder Via a Spanwise Surface Wire: Effect of the Wire Scale", Experiments in Fluids, Vol. 51, No. 3, pp. 753-769, (2011).
[13] Quadrante, L. A. R., and Nishi, Y., "Amplification/Suppression of Flow-induced Motions of an Elastically Mounted Circular Cylinder by Attaching Tripping Wires", Journal of Fluids and Structures, Vol. 48, pp. 93–102, (2014).
[14] Alam, M. M., Sakamoto, H., and Moriya, M., "Reduction of Fluid Forces Acting on a Single Circular Cylinder and Two Circular Cylinders by using Tripping Rods", Journal of Fluids and Structures, Vol. 18, No. 3-4, pp. 347–366, (2003).
 [15] Igarishi, T., "Effect of the Tripping Wires on the Flow around a Circular Cylinder Normal to an Airstream, Bulletin of JSME, Vol. 29 No. 255, pp. 2917-2924, (1986).
[16] Lu, B., and Bragg, M. B., "Experimental Investigation of the Wake-survey Method for a Bluff Body with a Highly Turbulent Wake, 20th AIAA Applied Aerodynamics Conference, Missouri, (2002).
[17] Dam, C. P. V., "Recent Experience with Different Methods of Drag Prediction", Progress in Aerospace Sciences, Vol. 35, No. 8, pp. 751-798, (1999).
[18] Goldstein, S., "A Note on the Measurement of Total Head and Static Pressure in a Turbulent Stream", Proceedings of the Royal Society a Mathematical, Physical and Engineering Sciences, Vol. 155, No. 886, pp. 570-575 , (1936).
[19] Ma, X., Karamanos, G. S., and Karniadakis, G. E., "Dynamics and Low-dimensionality of a Turbulent near Wake", Journal of Fluid Mechanics, Vol. 410, pp. 29–65, (2000).