Numerical study of reduction of fluid forces acting on a square cylinder using a control plate

2021 ◽  
Vol 44 (1) ◽  
Author(s):  
Zia-ul-Islam ◽  
Shams-ul-Islam ◽  
Chao Ying Zhou ◽  
Naveed Sheikh
Keyword(s):  
Numerical Study ◽  
Square Cylinder ◽  
Fluid Forces ◽  
Control Plate

scholarly journals T-Shaped Control Plate Effect on Flow past a Square Cylinder at Low Reynolds Numbers

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Maryam Shahab ◽  
Shams Ul-Islam ◽  
Ghazala Nazeer
Keyword(s):  
Passive Control ◽  
Flow Characteristics ◽  
Reynolds Numbers ◽  
Square Cylinder ◽  
Optimum Length ◽  
Low Reynolds Numbers ◽  
Fluid Forces ◽  
Drag Forces ◽  
Control Plate ◽  
Low Reynolds

In this study, the influence of the T-shaped control plate on the fluid flow characteristics around a square cylinder for a low Reynolds numbers flow is systematically presented. The introduction of upstream attached T-shaped control plate is novel of its kind as T-shaped control plate used for the first time rather than the other passive control methods available in the literature. The Reynolds numbers (Re) are chosen to be Re = 100, 150, 200, and 250, and the T-shaped control plate of the same width with varying length is considered. A numerical investigation is performed using the single-relaxation-time lattice Boltzmann method. The numerical results reveal that there exists an optimum length of T-shaped control plate for reducing fluid forces. This optimum length was found to be 0.5 for Re = 100, 150, and 200 and 2 for Re = 250. At this optimum length, the fluctuating drag forces acting on the cylinder are reduced by 134%, 1375, 133%, and 136% for Re = 100, 150, 200, and 250, respectively. Instantaneous and time-averaged flow fields were also presented for some selected cases in order to identify the three different flow regimes around T-shaped control plate and square cylinder system.

Numerical Prediction of Turbulent Wakes Behind a Square Cylinder

1998 ◽  
Vol 14 (1) ◽  
pp. 23-29
Author(s):  
Robert R. Hwang ◽  
Sheng-Yuh Jaw
Keyword(s):  
Stokes Equations ◽  
Numerical Study ◽  
Navier Stokes ◽  
Wall Region ◽  
Square Cylinder ◽  
Mean Velocity ◽  
Navier Stokes Equations ◽  
Turbulent Vortex Shedding ◽  
Model Equations ◽  
Good Agreement

ABSTRACTThis paper presents a numerical study on turbulent vortex shedding flows past a square cylinder. The 2D unsteady periodic shedding motion was resolved in the calculation and the superimposed turbulent fluctuations were simulated with a second-order Reynolds-stress closure model. The calculations were carried out by solving numerically the fully elliptic ensemble-averaged Navier-Stokes equations coupled with the turbulence model equations together with the two-layer approach in the treatment of the near-wall region. The performance of the computations was evaluated by comparing the numerical results with data from available experiments. Results indicate that the present study gives good agreement in the shedding frequency and mean drag as well as in some phase profiles of the mean velocity.

Numerical study on the fluid flow pass a square cylinder: The temperature-viscosity dependence

2014 ◽  
Vol 25 (03) ◽  
pp. 1350101
Author(s):  
Jianhua Lu ◽  
Sheng Li ◽  
Zhaoli Guo ◽  
Baochang Shi
Keyword(s):  
Fluid Flow ◽  
Free Stream ◽  
Numerical Study ◽  
Effect Of Temperature ◽  
Square Cylinder ◽  
Efficient Tool ◽  
Multiple Relaxation Time ◽  
Upward Velocity ◽  
Drag And Lift ◽  
Viscosity Dependence

In this paper, the 2D fluid flow pass a heated/cooled square cylinder exposed to a constant free-stream upward velocity is simulated via a multiple relaxation time (MRT) lattice-Boltzmann (LB) method. The buoyancy effect on the drag and lift coefficients as well as Nusselt number related is compared with the results in the existing literatures to validate the code used. The effect of temperature-viscosity dependence is then investigated to test whether the effect can be neglected or not for the mixed convection case. It is shown that the effect cannot be ignored when |Ri| > 0.15. Fortunately, the effect can be captured by using an effective temperature formula [J. M. Shi, D. Ferlach, M. Breuer, G. Biswas and F. Durst, Phys. Fluids16, 4331 (2004)] in a rather large range of Ri. All the numerical results, from another angle, also demonstrate that the MRT method is an efficient tool in simulating the problems such as the present one.

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