Wake Modifications in Confined Flows Due to the Presence of a Downstream Cylinder in Staggered Arrangement

Authors

  • Ahmad H. A Hamid

  • Mohd H. Jamaludin

  • Mohd H. M. Noh

  • Mohd A. M. Sapardi

Received date: November 30, 2018

Accepted date: November 30, 2018

Published date: November 30, 2018

DOI:

https://doi.org/10.14419/ijet.v7i4.27.22500

Keywords:

Drag coefficient, Lift coefficient, Square cylinder, Strouhal number, Vortex shedding.

Abstract

In the present study, confined flows around two square cylinders in staggered arrangement were numerically investigated. Cross-flow and streamwise center-to-center spacings of one- and three-cylinder diameters, respectively, were considered. Simulations were carried out at Reynolds numbers Re = 50,100,150 and 180, where the resulting wakes are laminar and periodic. Results indicate that the presence of the downstream cylinder tends to reduce the Strouhal number, amplitude and the time-averaged lift coefficient of the upstream cylinder relative to the single cylinder cases. Furthermore, the time variations of upstream cylinder’s lift coefficient behave similar to that of a single cylinder.

 

 

References

  1. [1] P. P. Patil and S. Tiwari, “Effect of blockage ratio on wake transition for flow past square cylinder,†Fluid Dyn. Res., vol. 40, no. 11–12, pp. 753–778, 2008.

    [2] A. H. A. Hamid, W. K. Hussam, and G. J. Sheard, “Combining an obstacle and electrically driven vortices to enhance heat transfer in a quasi-two-dimensional MHD duct flow,†J. Fluid Mech., vol. 792, no. 0, pp. 364–396, 2016.

    [3] F. Y. Xu, X. Y. Ying, and Z. Zhang, “Prediction of Unsteady Flow around a Square Cylinder Using RANS,†Appl. Mech. Mater., vol. 52–54, pp. 1165–1170, 2011.

    [4] P. Dey and A. K. Das, “Numerical analysis of drag and lift reduction of square cylinder,†Eng. Sci. Technol. an Int. J., vol. 18, no. 4, pp. 758–768, 2015.

    [5] A. Lankadasu and S. Vengadesan, “Onset of vortex shedding in planar shear flow past a square cylinder,†Int. J. Heat Fluid Flow, vol. 29, no. 4, pp. 1054–1059, 2008.

    [6] S. Bhattacharyya and D. K. Maiti, “Shear flow past a square cylinder near a wall,†Int. J. Eng. Sci., vol. 42, no. 19–20, pp. 2119–2134, 2004.

    [7] T. K. Prasanth and S. Ã. Mittal, “Flow-induced oscillation of two circular cylinders in tandem arrangement at low Re,†J. Fluids Struct., vol. 25, no. 6, pp. 1029–1048, 2009.

    [8] A. Etminan, M. Moosavi, and N. Ghaedsharafi, “Characteristics of aerodynamics forces acting on two square cylinders in the streamwise direction and its wake patterns,†Eur. Conf. Chem. Eng. ECCE’10, Eur. Conf. Civ. Eng. ECCIE’10, Eur. Conf. Mech. Eng. ECME’10, Eur. Conf. Control. ECC’10, pp. 209–217, 2010.

Downloads

How to Cite

H. A Hamid, A., H. Jamaludin, M., H. M. Noh, M., & A. M. Sapardi, M. (2018). Wake Modifications in Confined Flows Due to the Presence of a Downstream Cylinder in Staggered Arrangement. International Journal of Engineering and Technology, 7(4.27), 132-136. https://doi.org/10.14419/ijet.v7i4.27.22500

Received date: November 30, 2018

Accepted date: November 30, 2018

Published date: November 30, 2018