Near wake field of circular cylinder with a forward splitter plate

Chutkey, Kiran; Suriyanarayanan, P.; Venkatakrishnan, L.

doi:10.1016/j.jweia.2017.11.019

“…Later, Kawai (1990a,b) successfully reproduced the experimental results using discrete vortex model, the effect of length and location of SP is numerically investigated for both upstream and downstream location and reported the controlled shedding by positioning the SP both parallel and perpendicular to the main flow direction. Numerous other works (Arai and Komatsu 1992, Xu et al 1993, Kwon and Choi 1996, Anderson and Szewczyk 1997, Park and Higuchi 1998, Nakayama and Noda 2000, Turki 2008, Shukla et al 2009, Mat Ali et al 2011, Vamsee et al 2014, Ogunremi and Sumner 2015, Liu et al 2016, Lou et al 2016, Soumya and Prakash 2017, Sarioglu 2017, Chutkey et al 2018, Chauhan et al 2018, Liang et al 2018 also focused on drag reduction, vortex shedding suppression, reduced lift for the upstream/downstream and attached/detached SP, geometry of the structure, Reynolds number, angle of attack, various location of SP. Rathakrishnan (1999) experimentally studied the effect of angle of attack and reported the splitter plate is most effective on shedding control at zero pitch angle.…”

Section: Introductionmentioning

confidence: 99%

Convective heat transfer and laminar flow characteristics of flow over a circular cylinder in presence of control plates

S

¹

,

Malaikannan

²

,

Deepakkumar

³

2020

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The location and orientation effect of control plates (CP) in and around the flow separation region of a circular cylinder has been numerically investigated in the laminar flow regime at Reynolds number 100. The vortex shedding and convective heat transfer characteristics have been analysed for both upstream and downstream locations of the control plates using Ansys Fluent 18.0. The drag and lift coefficient (C D , C L ), the dimensionless vortex shedding frequency (Sr) and dimensionless convective heat transfer coefficient (Nu) are reported for various CP orientation and locations. The CP positioned along the main flow direction and located near the cylinder induce more shear on the cylinder surface, stabilities the wake vortices. In addition to shear generation, the CP orientation interacts effectively with the cylinder wake. The vortex shedding suppression with reduced drag on the cylinder is identified at many locations of CP. Convective heat transfer from the cylinder is suppressed at most of the locations of CP, at very few locations the cylinder heat transfer enhanced.

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“…Te analysis of passive control using a control plate employed in the upstream fow or a couple of plates individually positioned on the front and back sides of the obstacle received substantially less attention in the literature than the extensive studies on wake-mounted splitter plates. According to experimental fndings by Chutkey et al [26], an upstream positioned plate with a size of 1D can postpone the boundary layer disconnection point from 82 °to 122 °when compared to a plain cylinder. Te impact of the gap separation on an obstacle with a pair of unattached control plates was numerically studied by Hwang and Yang [27].…”

Section: Introductionmentioning

confidence: 99%

Control over Vortex Shedding and Drag Force on a Circular Obstacle Using a Pair of Downstream Splitter Plates in a Transient Flow

Ain

¹

,

Rasheed

²

,

Abbasi

³

2023

Mathematical Problems in Engineering

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The current work is an analysis of the laminar, two-dimensional, and transient flow over a circular cylinder with a two-branched splitter plate. For complex nonlinear governing equations, the finite element method is used as a computational approach. The objective of the current study is to determine the best conditions using geometrical characteristics along with the impact of Reynolds number R e .The geometric parameters, α which is the angle of separation between the pair of splitter plates of length L and G / D which is the gap from diameter ratio of the splitter plate to cylinder diameter, are the controlling tools for the present study. Due to its little impact on flow characteristics, it was discovered that using a two-branched splitter plate in Reynolds numbers under 100 is not desirable. A complete vortex shedding has been achieved with α = 0 ° and G / D = 2 at R e = 100 and also the periodic behavior of velocity has been controlled. The least drag force is observed at an angle of 30 ° between the two plates compared to another angle of 0 ° . It is not advised to use two splitter plates at angles more than 30 ° because this will not further contribute in the drag reduction. Since the gap to diameter ratio between the splitter plates and the cylinder increased up to a significant value, the overall control on hydrodynamic effects is achieved. It is concluded that the maximum drag reduction of 48% over the cylinder has taken place when the R e i s 200 , α i s 30 ° , a n d G / D i s 2 .

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“…They discovered that the change in drag force with varying Reynolds numbers was similar to the simple cylinder case, but the drag force for the flexible splitter plate was greater than for the simple cylinder. More research on passive flow past cylinder control can be found in Wang and colleagues 25–31 …”

Section: Introductionmentioning

confidence: 99%

“…More research on passive flow past cylinder control can be found in Wang and colleagues. [25][26][27][28][29][30][31] Along with the study of fluid flow, it is also relevant to study forced convection if the cylinder is heated. It is of huge importance in cooling towers, 32 hot-wire anemometer, 33 heat exchanger tubes in industry, designing atomic reactors, and so on.…”

Section: Introductionmentioning

confidence: 99%

Effect of arc‐shaped vertical control plate on heat and mass transfer in uniform flow past an isothermally heated circular cylinder

Ray

¹

,

Haty

²

2022

Heat Trans

0

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The current work investigates the effect of an arc‐shaped vertical control plate on the heat and mass transfer in uniform flow past an isothermally heated circular cylinder. The control plate is positioned downstream at various distances from the circular cylinder's surface. The governing equations are discretized by the higher order compact (HOC) finite difference scheme, and then this system of discretized equations is solved by using a bi‐conjugate gradient stabilized iterative method for Prandtl number Pr=0.7 $Pr=0.7$, Reynolds number Re=150 $Re=150$. To investigate the effect of an arc‐shaped control plate on heat and mass transfer, we consider a range of nondimensional distances between the circular cylinder and the control plate, 0.5≤d∕R0≤8 $0.5\le d\unicode{x02215}{R}_{0}\le 8$, where d $d$ is the control plate's distance and R0 ${R}_{0}$ is the cylinder's radius. The exact timing and location of the bifurcation points are calculated by using topological aspect‐based structural bifurcation analysis. Significant effects of various locations of the control plate on periodic wake and heat transfer are observed. It is found that the increasing distance of the control plate from the cylinder delays the occurrence of the structural bifurcation and shifts the bifurcation points upwards in the upper half and downwards in the lower half of the cylinder. Our study shows that the specific location of the control plate can fully suppress the vortex shedding. Time‐averaged total Nusselt number can be drastically reduced by increasing the distance between the control plate and the cylinder. With proper positioning, the vertical control plate can lessen the time‐averaged drag force by up to 22.5% $22.5 \% $ when compared to a cylinder without a control plate. Overall, this work presents many new phenomena that have not been reported before.

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Near wake field of circular cylinder with a forward splitter plate

Cited by 25 publications

References 27 publications

Convective heat transfer and laminar flow characteristics of flow over a circular cylinder in presence of control plates

Convective heat transfer and laminar flow characteristics of flow over a circular cylinder in presence of control plates

Control over Vortex Shedding and Drag Force on a Circular Obstacle Using a Pair of Downstream Splitter Plates in a Transient Flow

Effect of arc‐shaped vertical control plate on heat and mass transfer in uniform flow past an isothermally heated circular cylinder

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