Boundary layer effect on the vortex shedding of wall-mounted rectangular cylinder

Hassan, Mouhammad El; Bourgeois, Jason A.; Martinuzzi, Robert J.

doi:10.1007/s00348-014-1882-6

Cited by 56 publications

(15 citation statements)

References 24 publications

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“…The boundary layer thickness [18,19] and incident angles [20] are also known to effect the wake dynamics at higher Reynolds numbers. With respect to the former, for example, the experiments of Hosseini et al (2013) [18] and El Hassan et al (2015) [19] at Re = 1.2 × 10 4 identified that the boundary layer has a profound effect on the wake structures and vortex dynamics, including changing the interaction of horseshoe vortices with structures in the wake. Although these were limited to higher Reynolds numbers, similar behavior is intuitively expected for lower Re flows.…”

Section: Introductionmentioning

confidence: 99%

The Steady Wake of a Wall-Mounted Rectangular Prism with a Large-Depth-Ratio at Low Reynolds Numbers

2021

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The wakes of wall-mounted small (square) and large (long) depth-ratio rectangular prisms are numerically studied at Reynolds numbers of 50–250. The large depth-ratio significantly alters the dominance of lateral secondary flow (upwash and downwash) in the wake due to the reattachment of leading-edge separated flow on the surfaces of the prism. This changes the wake topology by varying the entrained flow in the wake region and changing the distribution of vorticity. Thus, the magnitude of vorticity significantly decreases by increasing the prism depth-ratio. Furthermore, the length of the recirculation region and the orientation of near wake flow structures are altered for the larger depth-ratio prism compared to the square prism. Drag and lift coefficients are also affected due to the change of pressure distributions on the rear face of the prism and surface friction force. This behavior is consistently observed for the entire range of Reynolds numbers considered here. The wake size is scaled with Re1/2, whereas drag coefficient scaled with Re−0.3.

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Section: Introductionmentioning

confidence: 99%

The Steady Wake of a Wall-Mounted Rectangular Prism with a Large-Depth-Ratio at Low Reynolds Numbers

2021

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“…Based on a grid independency study, the proper grid was chosen to simulate the flow field using Detached Eddy Simulation. The results were validated using the experimental results of El Hassan et al [4] in several horizontal and vertical planes through the wake. As seen in Fig.…”

Section: Computational Domainmentioning

confidence: 79%

“…In the experimental study by El Hassan et al [4], the cylinder was placed at the location along the bottom wall where the boundary layer thickness was 9.1 x 10 -3 m (72% d) in the absence of the cylinder. To properly benchmark the numerical setup with the experiment, the inlet condition is set to reproduce the velocity profile at the same location in the absence of the cylinder.…”

Section: Computational Domainmentioning

confidence: 99%

Flow Over A Wall-Mounted Finite-Length Square Cylinder

Chen¹,

Balachandar²

2018

Progress in Canadian Mechanical Engineering

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A conventional way of studying the flow characteristics of flow over a bluff body is by extracting the velocity distribution in horizontal planes crossing the bluff body near the bed, mid-height and close to the free-end location. The intention of selecting the planes at these levels is to examine the horseshoe vortex and the bed effect, flow separation at the mid-height, and the downwash flow from the free-end. In some cases, where a relatively short cylinder is studied along with a taller cylinder, the mid-height level of each may present very different flow structures. It is proposed in this study that a better way of selecting the planes of interest could be based on the pressure distribution imposed on the front surface of the bluff body by the approaching flow. This paper uses a sample numerical study of wall-mounted finitelength square cylinder with three aspect ratios of 1, 2 and 4, immersed in the air flow with a thin boundary layer. The horizontal planes based on the front face pressure distribution are selected and examined to show the advantage of the proposed method.

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“…Porteous et al (2014) reviewed the previous studies on the flow-induced noise from finite wall-mounted circular and square cylinders and then reported that the flow-induced noise characteristics of the wall-mounted cylinders were influenced by the height of the boundary layer. El Hassan et al (2015) demonstrated the influence of the turbulent boundary-layer thickness on the vortex dynamics in the wake of a wall-mounted rectangular cylinder. Porteous et al and Hosseini et al mentioned that the ratio of boundary-layer thickness to the cylinder diameter was important to the behavior of the horseshoe vortices and flow-induced noise.…”

Section: Introductionmentioning

confidence: 99%

Effects of an upstream tetrahedron on the circular cylinder–flat plate juncture flow

2015

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Boundary layer effect on the vortex shedding of wall-mounted rectangular cylinder

Cited by 56 publications

References 24 publications

The Steady Wake of a Wall-Mounted Rectangular Prism with a Large-Depth-Ratio at Low Reynolds Numbers

The Steady Wake of a Wall-Mounted Rectangular Prism with a Large-Depth-Ratio at Low Reynolds Numbers

Flow Over A Wall-Mounted Finite-Length Square Cylinder

Effects of an upstream tetrahedron on the circular cylinder–flat plate juncture flow

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