Numerical simulation of the flow past six-circular cylinders in rectangular configurations

Gao, Yangyang; Chen, Weiyi; Wang, Bin; Wang, Lizhong

doi:10.1007/s00773-019-00676-7

Cited by 9 publications

(4 citation statements)

References 52 publications

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“…CFD simulations revealed novel flow patterns behind multiple cylinders arranged in a 3 x 5 pattern. Unlike a single cylinder where the wake contains vortices that have a similar diameter to the cylinder, our results support recent analyses which show that it is possible for vortices in the wake of multiple cylinders to be larger in diameter than any single cylinder (Gao et al, 2020). In the KVS array of this study, the drag wake behind the central cylinder draws in vortices from lateral cylinders.…”

Section: Discussionsupporting

confidence: 89%

“…A great diversity of wakes can be produced behind multiple cylinders based on the ratio of streamwise to cross-stream cylinder gap space (Gao et al, 2020). We ran Computational Fluid Dynamics (CFD) simulations on 500 cylinder arrays of differing spacing ratios to search the parameter space of wakes based on vortex shedding periodicity (Stewart et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Swimming kinematics of rainbow trout behind cylinder arrays: the effect of vortex street periodicity and turbulence kinetic energy

Sparks,

Rajeev,

Canestrelli

et al. 2024

Preprint

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Fish in the wild often contend with complex flows that are produced by natural and artificial structures. Research into fish interactions with turbulence often investigates metrics such as turbulence kinetic energy (TKE) or fish positional location, with less attention paid to the specific interactions between vortex organization and body swimming kinematics. Here we compare the swimming kinematics of rainbow trout (Oncorhynchus mykiss) holding station in flows produced by two different 3 x 5 cylinder arrays. We systematically utilized computational fluid dynamics to generate one array that produced a Karman vortex street with high vortex periodicity and TKE (KVS array), and another that produced low periodicity and TKE, similar to a parallel vortex street (PVS array). The only difference in swimming kinematics between cylinder arrays was an increased tail beat amplitude in the KVS array. In both cylinder arrays, the tail beat frequency decreased and snout amplitude increased compared with the freestream. The center of mass amplitude was greater in the PVS array than in only the freestream, however, suggesting some buffeting of the body by the fluid. Notably, we did not observe Karman gaiting in the KVS array as in previous studies. We hypothesize that this is because (1) vorticity was dissipated in the region where fish held station in this study and (2) cylinder arrays produced vortices that were in-line rather than staggered. These results are the first to quantify the kinematics and behavior of fishes swimming in the wake of multiple cylinder arrays, which has important implications for biomechanics, fluid dynamics, and fisheries management.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Swimming kinematics of rainbow trout behind cylinder arrays: the effect of vortex street periodicity and turbulence kinetic energy

Sparks,

Rajeev,

Canestrelli

et al. 2024

Preprint

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show abstract

“…While many texts only consider the problem for inviscid flows and use potential flow methods to solve for exact solutions [69,70], here we include effects of viscosity to illustrate transitions to vortical flow, and upon doing so, a subset of the possible flow separation cases. Furthermore, flow past cylinders is also still an active area of contemporary research [71][72][73][74][75][76][77].…”

Section: Flow Past One or More Cylinders (Via Lattice Boltzmann)mentioning

confidence: 99%

Suite-CFD: An Array of Fluid Solvers Written in MATLAB and Python

Battista¹

2020

Fluids

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Computational Fluid Dynamics (CFD) models are being rapidly integrated into applications across all sciences and engineering. CFD harnesses the power of computers to solve the equations of fluid dynamics, which otherwise cannot be solved analytically except for very particular cases. Numerical solutions can be interpreted through traditional quantitative techniques as well as visually through qualitative snapshots of the flow data. As pictures are worth a thousand words, in many cases such visualizations are invaluable for understanding the fluid system. Unfortunately, vast mathematical knowledge is required to develop one’s own CFD software and commercial software options are expensive and thereby may be inaccessible to many potential practitioners. To that extent, CFD materials specifically designed for undergraduate education are limited. Here we provide an open-source repository, which contains numerous popular fluid solvers in 2 D (projection, spectral, and Lattice Boltzmann), with full implementations in both MATLAB and Python3. All output data is saved in the . v t k format, which can be visualized (and analyzed) with open-source visualization tools, such as VisIt or ParaView. Beyond the code, we also provide teaching resources, such as tutorials, flow snapshots, measurements, videos, and slides to streamline use of the software.

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“…The parameters which affect the flow field characteristics are the distance between the surface and the vortex core and the strength of the primary vortex formed. Gao et al [19] performed numerical simulations in two-dimensional of the flow over six cylinders arranged in a configuration of a 2×3 matrix and a configuration of a 3×2 matrix. The simulations were presented at a low Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Three dimensional flow over elliptic cylinders arrays in octagonal arrangement

KUMAR

Singh

2021

Journal of Thermal Engineering

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A numerical study of flow characteristics around eight elliptic cross-section cylinders in an octagonal configuration is presented. The axis ratio of elliptic cylinder is taken as 1:2. Three spacings between the cylinders (0.07 m, 0.14 m and 0.2 m), two angles of attack (α=0° and α=15°) and two Reynolds numbers (Re=4060 and Re=45800) are considered to investigate the parametric influences. The flow is modelled using three-dimensional large eddy simulation. Simulations are performed by utilizing ANSYS Fluent software. The results comprise of flow patterns and force coefficients (drag and lift). It is seen that both the drag and lift forces acting on the cylinders vary with the spacings values, angle of attack and Reynolds numbers. The lift force peaks at α=15° and Reynolds number 45800. The drag force on the upstream cylinder reaches its peak at α=0° and Reynolds number 4060. It is observed that the drag on the upstream cylinders decreases as the value of the Reynolds number increases. Contours of velocity and subgrid turbulent viscosity are also presented. Moreover, it is concluded from the present study that the effect of change in the Reynolds number on flow characteristics is more significant as compared to the change in the spacing between the cylinders.

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Numerical simulation of the flow past six-circular cylinders in rectangular configurations

Cited by 9 publications

References 52 publications

Swimming kinematics of rainbow trout behind cylinder arrays: the effect of vortex street periodicity and turbulence kinetic energy

Swimming kinematics of rainbow trout behind cylinder arrays: the effect of vortex street periodicity and turbulence kinetic energy

Suite-CFD: An Array of Fluid Solvers Written in MATLAB and Python

Three dimensional flow over elliptic cylinders arrays in octagonal arrangement

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