Experimental and Numerical Flow Visualization of a Single Square Cylinder

Dayem, Adel M. Abdel; Bayomi, N. N.

doi:10.1080/155022891010079

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Long distance of calculation domain was considered in front of the cylinder to compute the deformation of the flow around cylinder accurately. 39 All velocity components (u, v) were specified as zero, known as no-slip boundary condition, on the lower boundary and cylinder surface. The inlet condition has inlet velocity with a component in horizontal direction of u 0 = 0.190 m/s determined from the measured velocity distribution.…”

Section: Solution Domain and Boundary Conditionsmentioning

confidence: 99%

“…The fine mesh around the cylinder can accelerate the solution convergence and avoid any solution divergence and errors in this critical area. 39 Therefore, relatively finer meshes were used near the lower boundary and the cylinder surface, where high magnitude vortices and high-gradient velocity distributions are created due to wall friction. Taking this fact into account, the computational domain was divided into six subdomains in which different mesh densities of either uniform or compressed meshes were used.…”

Section: Computational Meshingmentioning

confidence: 99%

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Numerical investigation of flow around a pipeline with a spoiler near a rigid bed

Öner

2016

Advances in Mechanical Engineering

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Interaction of current with circular cylinders near a rigid bed is significant in the design of offshore structures, such as pipelines. Pipelines are buried to the seabed to be protected from damages caused by hydrodynamic forces or human activities. The pipeline laid on movable bed can be buried due to local scouring. A vertical plate on pipeline, called spoiler, has been developed to increase the rate and extend of scouring. In this study, the two-dimensional turbulent flow around a smooth pipeline with a spoiler was investigated at Re D = 9500 near the bed. The governing equations for the current problem were solved using ANSYS Ò 11.0-Flotran program package based on finite element method. The performance of the standard k-e, standard k-v, and shear stress transport turbulence models were examined on five computational meshes with different densities. The results obtained were compared with the published experimental measurements in literature. Present results showed that the attachment of a spoiler caused a large separation area in both upstream and downstream of the pipeline. The attachment of spoiler on top of the pipe increased the drag and decreased the lift force on pipe. Moreover, the spoiler causes non-zero downward lift. It is concluded that the k-v turbulence model on the finest mesh is found relatively better in simulation of the flow field.

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Section: Solution Domain and Boundary Conditionsmentioning

confidence: 99%

Section: Computational Meshingmentioning

confidence: 99%

Numerical investigation of flow around a pipeline with a spoiler near a rigid bed

Öner

2016

Advances in Mechanical Engineering

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“…In the case of movable beds the effect is scouring of bed material away from the horseshoe vortex region. Dayem and Bayomi [13] performed experimental and numerical studies on the flow around a single square cylinder. In the experimental work, the pressure around the cylinder was measured and the pressure coefficient, the corresponding drag coefficient and side force coefficient were estimated.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analyses of the Flow Around a Horizontal Wall-Mounted Circular Cylinder

Aköz

Kırkgöz

2009

Transactions of the Canadian Society for Mechanical Engineering

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The numerical modeling of two-dimensional turbulent flow around a horizontal wall-mounted circular cylinder at Reynolds numbers in the range of 1000≤ReD≤7000 is investigated. Ansys® 10.0-FLOTRAN program package is used to solve the governing equations by finite element method, and the performance of the standard k-ε, standard k-ω and SST turbulence models are examined. A sensitivity study for the three turbulence models is carried out on eight computational meshes with different densities and structures. The computational velocity fields from the present simulations are compared with the experimental results obtained from particle image velocimetry (PIV) measurements for validation purposes. The point of the boundary layer detachment from the cylinder surface and the lengths of primary and secondary separation regions occurring around the cylinder are determined numerically and compared with those obtained experimentally. From these comparisons it is found that the numerical modeling using either of k-ω and SST turbulence models is reasonably successful. Using the results of numerical solutions, the drag and lift coefficients, Cd and Cl, are also calculated and compared with the measured values.

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The Influence of Square Wire Attack Angle on the Heat Convection from a Surrogate PV Panel

Yang

Ahmed

Ting

et al. 2018

Springer Proceedings in Energy

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Experimental and Numerical Flow Visualization of a Single Square Cylinder

Cited by 5 publications

References 7 publications

Numerical investigation of flow around a pipeline with a spoiler near a rigid bed

Numerical investigation of flow around a pipeline with a spoiler near a rigid bed

Numerical and Experimental Analyses of the Flow Around a Horizontal Wall-Mounted Circular Cylinder

The Influence of Square Wire Attack Angle on the Heat Convection from a Surrogate PV Panel

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