Experimental and Numerical Investigation of Flow Structures around Cylindrical Bluff Bodies

Yagmur, Sercan; Doğan, Sercan; Aksoy, Muharrem Hilmi; Canlı, Eyüb; Özgören, Muammer

doi:10.1051/epjconf/20159202113

Cited by 14 publications

(5 citation statements)

References 18 publications

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“…The wake length has been obtained as longer at Re = 5000 by using PIV and LES methods for all cases. Furthermore, the longest wake length was yielded for triangular cylinder whereas the square cylinder has the shortest one in this classification [11]. The aim of the present study is to compare different turbulence models in terms of hydrodynamic flow characteristics in order to determine the most proper turbulence model among the investigated ones with respect to the experimental data from the literature.…”

Section: Introductionmentioning

confidence: 96%

Assessment of Turbulence Models for Flow around a Surface-Mounted Cube

Doğan¹,

Yagmur²,

Göktepeli³

et al. 2017

IJMERR

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Flow over a bluff body constitutes one of the most fundamental phenomena for engineering applications. Even though a cube is considered as a simple bluff body to examine with respect to the flow structure, there is more complicated flow physics around the cube than expected. Thus, a cube just like other bluff bodies is mostly used in the comparison process of numerical and experimental results to determine the more suitable turbulence model in case of undertaken problem. For this reason, in this paper, turbulence models have been employed to investigate the flow characteristics around a surface-mounted cube at Re = 3700 based on the edge length of the cube in terms of Computational Fluid Dynamics (CFD) and then compared with experimental results in the literature. Normalized and time-averaged results of velocity vector fields, streamwise and cross-stream velocity components, vorticity contours and streamline patterns have been numerically obtained by using k-ε Re-Normalization Group (RNG), k-ω Shear Stress Transport (SST) and Large Eddy Simulation (LES) turbulence models. LES turbulence model has presented the best prediction of hydrodynamic characteristics for the body among the investigated turbulence models in this study. Although k-ω SST turbulence model was the second successful one after LES method among the investigated turbulence models for the estimation of flow structure around the cube, k-ε RNG turbulence model was failed to capture the flow fluctuations in the wake region of the geometry. 

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Section: Introductionmentioning

confidence: 96%

Assessment of Turbulence Models for Flow around a Surface-Mounted Cube

Doğan¹,

Yagmur²,

Göktepeli³

et al. 2017

IJMERR

Self Cite

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“…Vectors and streamlines are adopted to study the flow features. Yagmur et al (2015) [5] investigated numerically and experimentally the flow pattern in the wake region of various bluff bodies like a triangle, square and circular cross-section of cylinders placed horizontally and perpendicularly to the flow. The experimental work is carried out in an open channel at water Reynolds numbers 10000 and 5000.…”

Section: Introductionmentioning

confidence: 99%

The Impact of the Vane Angle on the Hydraulic Behaviour Around the Cylinder

Jabbar¹,

Qasim²,

Mohammed³

2022

Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7-9

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The flow around an obstacle represents a challenge in fluid mechanics problems and practice. So, it is significant to investigate the hydraulic behaviour around the obstacle and the response of the obstacle which encounters the flow suddenly. The target of the present paper deal with the investigation numerically the effect of changing the vane angle on the hydraulic field around the cylinder and the response of the cylinder to the angle change. The vane has an angle shape with different angles ranging from 20 degrees to 90 degrees, the dimension of the angle is adopted as a function of the cylinder diameter. The study concentrates on the average flow velocity, strain rate, shear stress, static pressure, dynamic pressure, pressure coefficient, skin friction coefficient, drag coefficient, and lift coefficient. The obtained result shows a noticeable variation in the response of the hydraulic field around the cylinder especially in average flow velocity, static pressure, dynamic pressure, strain rate, and shear stress. The negative lift coefficient and negative drag coefficient appear in the numerical investigation. Also, a negative pressure coefficient is found. Many reasons will lead to the negative response like pressure difference from section to section, changing inflow velocity owing to the existence of the vane in addition to the cylinder, flow separation zone expansion, flow velocity dissipation owing to the existence of the vane, momentum transfer from section to section and turbulence level.

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“…A group of cylinders placed in different arrangements play a vital role in various engineering applications, including the offshore marine industry, the drilling hydrocarbons to the surface, designing the fishnets in fish farms, the analysis of the pipeline seabed, where cylinders are placed in tandem, side-by-side and staggered, respectively. Flow hydrodynamic around a single cylinder are covered in but not limited to [8]; [9]; [10]; [11]; [12]; [13]; [14]; [15]; [16]; [17]; [18] [19]; [20]. Two cylinders in side by side arrangements were considered by not limited to [21]; [22]; [23]; [24]; [25]; [26]; [27]; [28]; [29]; [30]; [31]; [32].…”

Section: Introductionmentioning

confidence: 99%

The flow hydrodynamics around a single and side by side cylinders using LES and RANS

Gazi

Hussain

Abdul

2022

Preprint

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A comparative study of the flow hydrodynamics around two cylinders, simulated using Reynolds Averaged Navier Stokes (RANS) and Large Eddy Simulation (LES), are investigated in this paper. Numerical simulation results of the flow field around a single cylinder and side by side cylinders have been carried out using OpenFOAM toolbox for both circular and square cylinders. The computational flow domain of 26D × 20D × 3D in streamwise, spanwise and vertical directions is considered, respectively. Simulations are performed for four different values of Reynolds numbers, Re = 253, 12674, 25348, and 126746 (representing the change of the flow from laminar to turbulent) and for three different gap ratios between the cylinders, S/D = 2, 3, and 4. Grid convergence studies are carried out for the concerned geometry. Effect of Reynolds number and gap ratios on horseshe vortex, wake vortex, and streamlines are explored. At low Reynolds number and low gap ratio, flow regimes around a single cylinder are noticed different from side-by-side cylinders, because of the interaction of the flow with two cylinders. However, at higher Reynolds numbers and gap ratios, the flow pattern is observed to be independent of the spacing between the cylinders. The LES model exhibited better accuracy when compared to the RANS in describing the flow hydrodynamics. The OpenFOAM results are validated against the existing data available in the scientific literature.

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Experimental and Numerical Investigation of Flow Structures around Cylindrical Bluff Bodies

Cited by 14 publications

References 18 publications

Assessment of Turbulence Models for Flow around a Surface-Mounted Cube

Assessment of Turbulence Models for Flow around a Surface-Mounted Cube

The Impact of the Vane Angle on the Hydraulic Behaviour Around the Cylinder

The flow hydrodynamics around a single and side by side cylinders using LES and RANS

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