Abstract
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.
Highlights
Controlling of flow and suppression of fluid forces around bluff bodies is an important research area for engineers and scientists because of its practical importance in mechanical engineering, structures and buildings, aeronautical engineering etc., at high Reynolds number (Re)
Keeping in view these importance, the present study was conducted to systematically analyze the importance of upstream attached T-shaped control plate length, ranging from L/D 0.5 to 8 at Reynolds numbers, Re 100, 150, 200, and 250. e present numerical results are calculated after the dynamic steady-state condition is reached (see equation (19)). e most important findings on the basis of our numerical investigation will be presented in detail
A two-dimensional unsteady fluid flow around a square cylinder with an upstream attached T-shaped control plate was investigated numerically, and the important findings were reported in the present study. e flow characteristics and fluid forces were examined at Re 100, 150, 200, and 250. e length of the T-shaped control plate is varied
Summary
Controlling of flow and suppression of fluid forces around bluff bodies is an important research area for engineers and scientists because of its practical importance in mechanical engineering, structures and buildings, aeronautical engineering etc., at high Reynolds number (Re). E flow wake around the bluff structures can generate unsteady forces which have the potential to damage the structural integrity. Erefore, it is important to fully understand the flow characteristics and their resulting effects on the structure in order to control the structure integrity. Successful flow control remarkably reduces the magnitude and effects of the fluctuating forces directly acting on the surfaces of the bluff body. One can use either active or passive techniques to control the wake and reduce the fluid forces. E development of passive methods of reduction of fluid forces and wake control is an active area of research One can use either active or passive techniques to control the wake and reduce the fluid forces. e passive technique does not require any external energy like the active technique. e previous experimental measurements and numerical studies for flow control include splitter plates [1,2,3,4,5,6,7,8,9,10] and control cylinders/rods [11,12,13,14,15,16,17,18] for Re between 80 and 2000. e development of passive methods of reduction of fluid forces and wake control is an active area of research
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