Affiliation:
1. nema
2. Institute of Fluid Mechanics, China Jiliang University, Hangzhou, China
Abstract
To investigate the characteristics of flow over two finite-length cylinders
in tandem arrangement, numerical simulations were performed using CFD
technique for spacing ratios (S = D/d, where d is the diameter of the
cylinders and D is the separation gap between the cylinders) between 0.5 and
12 at a Reynolds number of 200. The height-to-diameter ratio (h/d, where h
is the height of the cylinders) was fixed at 8. This study primarily focuses
on the effects of S and the free ends on the vortical structure behind the
cylinders. The S has a significant effect on the Strouhal number and on the
lift and drag coefficients of cylinders. The results show extremely
different vortex streets at different cylinder heights. With an increase in
S, the average drag coefficient of the downstream cylinder increases,
whereas that of the upstream cylinder first decreases and then increases.
Additionally, as S changes between 4.5 and 5, the average drag coefficient
of the two cylinders changes suddenly. The effects of S on Strouhal number
and the lift coefficient ex-hibit a complex behavior.
Publisher
National Library of Serbia
Subject
Renewable Energy, Sustainability and the Environment
Reference31 articles.
1. Lin, L., et al., Numerical simulation of the characteristics and interaction of flow around side-by-side arranged circular cylinders, Chinese journal of applied mechanics, 38 (2021), 2, pp. 844-850
2. Alam, M. M., et al., Fluctuating fluid forces acting on two circular cylinders in a tandem arrangement at a subcritical Reynolds number, Journal of Wind Engineering and Industrial Aerodynamics, 91(2003), 1-2, pp.139-154
3. Silva, A., et al., Numerical simulation of two-dimensional flows over a circular cylinder using the immersed boundary method, Journal of Computational Physics, 189 (2003), 2, pp. 351-370
4. Ong, M. C., et al., Numerical simulation of flow around a smooth circular cylinder at very high Reynolds numbers, Marine Structures, 22 (2009), 2, pp.142-153
5. Wang, Y. L., Shao, X. M., Study on flow of power-law fluid through an infinite array of circular cylinders with immersed boundary-lattice Boltzmann method, Thermal Science, 16 (2012), 5, pp.1451-1455