Large-Eddy Simulation of Turbulent Flow Past a Square Cylinder Confined in a Channel

Kim, Do-Hyeong; Yang, Gyeong-Su

doi:10.3795/ksme-b.2002.26.2.261

Cited by 15 publications

(31 citation statements)

References 11 publications

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“…The channel flow and the cylinder flow domains are connected, to highlight the smooth transfer of the flow conditions at the domain boundary. Careful observation shows that the flow field in the inlet region of the cylinder flow domain [27]; symbols: experimental by Nakagawa et al [26]. Blue: z = 1d; orange: z = 3d.…”

Section: Results For Flow Over a Square Cylindermentioning

confidence: 97%

“…The Reynolds number, defined as Re = U in d/ν, where U in is the average inlet velocity, was 3000, and the blockage ratio, [25] defined as d/H , where H is the channel height, was 20 %. This particular flow configuration was studied experimentally by Nakagawa et al [26], and numerically using a finite volume method based LES by Kim et al [27].…”

Section: Problem Descriptionmentioning

confidence: 98%

“…Kim et al [27] then conducted a numerical study in order to verify the experimental results of Nakagawa et al [26]. They solved the three-dimensional incompressible NavierStokes equations, which were filtered by a box filter, on a non-uniform staggered Cartesian grid, using the finite volume method with the fractional time-stepping method for time integration.…”

Section: Problem Descriptionmentioning

confidence: 98%

“…Two separate cases with spanwise dimensions of 1d and 3d were conducted, to evaluate its effect on the results. The cylinder location with respect to the inlet location was made identical to [26] and [27] (Fig. 5).…”

Section: Problem Descriptionmentioning

confidence: 99%

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The Lattice Boltzmann Method Implemented on the GPU to Simulate the Turbulent Flow Over a Square Cylinder Confined in a Channel

Koda

Lien

2014

Flow Turbulence Combust

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The lattice Boltzmann method (LBM) is a relatively new method for fluid flow simulations, and is recently gaining popularity due to its simple algorithm and parallel scalability. Although the method has been successfully applied to a wide range of flow physics, its capabilities in simulating turbulent flow is still under-validated. Hence, in this paper, a 3D LBM code was developed to investigate the validity of the LBM for turbulent flow simulations through large eddy simulations (LES). A GPU enabled LBM code was developed, and validated against a benchmark test case involving the flow over a square cylinder in square channel. The flow results showed good agreement with literature, and speedups of over 150 times were observed when two GPUs were used in parallel. Turbulent flow simulations were then conducted using LES with the Smagorinsky subgrid model. The methodology was first validated by computing the fully developed turbulent channel flow, and comparing the results against direct numerical simulation results. The results were in good agreement despite the relatively coarse grid. The code was then used to simulate the turbulent flow over a square cylinder confined in a channel. In order to emulate a realistic inflow at the channel inlet, an auxiliary simulation consisting of a fully developed turbulent channel flow was run in conjunction, and its velocity profile was used to enforce the inlet boundary condition for the cylinder flow simulation. Comparison of the results with experimental and numerical results revealed that the presence of the turbulent flow structures at the inlet can significantly influence the resulting flow field around the cylinder.

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Section: Results For Flow Over a Square Cylindermentioning

confidence: 97%

Section: Problem Descriptionmentioning

confidence: 98%

Section: Problem Descriptionmentioning

confidence: 98%

Section: Problem Descriptionmentioning

confidence: 99%

See 2 more Smart Citations

The Lattice Boltzmann Method Implemented on the GPU to Simulate the Turbulent Flow Over a Square Cylinder Confined in a Channel

Koda

Lien

2014

Flow Turbulence Combust

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“…Several studies have been recently conducted in relation to the flow over blunt bodies located inside a parallel-plates channel: Scanlon et al (1999) performed a numerical simulation of the laminar vortex shedding from a rectangular cylinder within a confined channel, Kim et al (2004) performed a large-eddy numerical simulation of the flow past a square cylinder confined in a channel, Hwang and Yang (2004) performed a numerical study of the vortical structures around a wall-mounted cubic obstacle within a confined channel. These authors studied both the horseshoe vortex system and the laminar wake for low-to-moderate Reynolds numbers, finding that unsteady horseshoe vortex systems are only found in the entrance region of the channel, and hard to find for obstacles located in the fully viscous channel region.…”

Section: Introductionmentioning

confidence: 99%

The laminar horseshoe vortex upstream of a short-cylinder confined in a channel formed by a pair of parallel plates

Domínguez

Romero‐Méndez

Ramos-Paláu

et al. 2006

J Vis

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A flow visualization experiment was performed in order to characterize the laminar horseshoe vortex system that appears upstream of the junction of a short cylinder and a pair of flat parallel plates. The experiments were performed in a water tunnel and the technique used for flow visualization was laser illumination of seeded particles whose traces were captured using long exposure photography. Geometrical and flow parameters, such as Reynolds number and height-to-diameter ratio of the cylinders, are varied during the experiments and the flow regimes are analyzed as a function of these parameters. The behavior of vortex systems is reported. For low Reynolds number cases, the vortices stay in a fixed position, as the Reynolds number is increased the number of vortices grows and for larger Reynolds numbers the vortex system becomes oscillatory and for further increases it becomes periodic. As for the dimensionless height of the cylinders, the vortex system is weak for short cylinders and increases its strength and number of vortices as the cylinder height-to-diameter ratio is increased. For further increases in height the vortex system do not change, which shows that the flow becomes independent of the height-to-diameter ratio for sufficiently tall cylinders. Information of the frequency of appearance of periodic vortices is also included.

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Validation of a novel very large eddy simulation method for simulation of turbulent separated flow

Han

Krajnović

2013

Numerical Methods in Fluids

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SUMMARY The paper describes the validation of a newly developed very LES (VLES) method for the simulation of turbulent separated flow. The new VLES method is a unified simulation approach that can change seamlessly from Reynolds‐averaged Navier–Stokes to DNS depending on the numerical resolution. Four complex test cases are selected to validate the performance of the new method, that is, the flow past a square cylinder at Re = 3000 confined in a channel (with a blockage ratio of 20%), the turbulent flow over a circular cylinder at Re = 3900 as well as Re = 140,000, and a turbulent backward‐facing step flow with a thick incoming boundary layer at Re = 40,000. The simulation results are compared with available experimental, LES, and detached eddy simulation‐type results. The new VLES model performs well overall, and the predictions are satisfactory compared with previous experimental and numerical results. It is observed that the new VLES method is quite efficient for the turbulent flow simulations; that is, good predictions can be obtained using a quite coarse mesh compared with the previous LES method. Discussions of the implementation of the present VLES modeling are also conducted on the basis of the simulations of turbulent channel flow up to high Reynolds number of Reτ = 4000. The efficiency of the present VLES modeling is also observed in the channel flow simulation. From a practical point of view, this new method has considerable potential for more complex turbulent flow simulations at relative high Reynolds numbers. Copyright © 2013 John Wiley & Sons, Ltd.

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Large-Eddy Simulation of Turbulent Flow Past a Square Cylinder Confined in a Channel

Cited by 15 publications

References 11 publications

The Lattice Boltzmann Method Implemented on the GPU to Simulate the Turbulent Flow Over a Square Cylinder Confined in a Channel

The Lattice Boltzmann Method Implemented on the GPU to Simulate the Turbulent Flow Over a Square Cylinder Confined in a Channel

The laminar horseshoe vortex upstream of a short-cylinder confined in a channel formed by a pair of parallel plates

Validation of a novel very large eddy simulation method for simulation of turbulent separated flow

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