Characteristics of the flow around four cylinders of various shapes

Nguyen, Van Luc; Nguyen-Thoi, T.; Duong, Viet Dung

doi:10.1016/j.oceaneng.2021.109690

Cited by 14 publications

(6 citation statements)

References 44 publications

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“…The particle core size is defined as 1/275 at Re =1000, as referred to references. 31,[48][49][50] As shown in Figure 3, the vorticity contours of the present results qualitatively agree well with those of reference for three angles of attack. In particular, the sizes of the leading-and trailing-edge vortices of the present work coincide with those of reference.…”

Section: Computation Setupsupporting

confidence: 88%

Low order modeling of dynamic stall using vortex particle method and dynamic mode decomposition

Nguyen

Duong

Trinh

et al. 2023

International Journal of Micro Air Vehicles

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Low order modelings are performed in this paper, including iterative Brinkman penalized vortex method (IBVM) and data-driven dynamic mode decomposition (DMD) for dynamic stall study of symmetric airfoil. The data are extracted from IBVM as input for flow field reconstruction using combinations of DMD dominant modes, representing extracted flow features. The primary mode together with its harmonics, and the mean mode are termed to be dominant for the airfoil wake duplication at fixed angles of attack ([Formula: see text]) ranging from [Formula: see text] to [Formula: see text]. For the dynamic stall duplication, at small and large pitching amplitudes, the nearfield and farfield vorticty contours from the DMD generally agree well with those from the IBVM. In addition, the lift coefficient from the DMD collapses well with that from the IBVM and the experiment.

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Section: Computation Setupsupporting

confidence: 88%

Low order modeling of dynamic stall using vortex particle method and dynamic mode decomposition

Nguyen

Duong

Trinh

et al. 2023

International Journal of Micro Air Vehicles

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“…Two development branches of the method have been formed as continuous-and discrete-forcing IB methods. When applying the penalization technique (a type of continuousforcing IB methods) to enforce the no-slip condition of the fluid flow on the solid body surface [16,[20][21][22][23], the momentum equation, Eq. ( 4), is rewritten in the penalization term as…”

Section: A Continuous-forcing Immersed Boundary Methodsmentioning

confidence: 99%

“…Cottet and Koumoutsakos [13] combined it with a viscous model to simulate two-and three-dimensional incompressible viscous flows. A VIC method was developed to simulate the flow around two tandem cylinders, the flow around four cylinders of various shapes, and the vortex−wall interaction by Nguyen et al [14][15][16]. It was proven that the method could capture the vortex shedding, the interaction between the vortex wakes, the fluid forces exerted on the cylinders, and the vortex formation and deformation due to the wall effects.…”

Section: Introductionmentioning

confidence: 99%

“…It was proven that the method could capture the vortex shedding, the interaction between the vortex wakes, the fluid forces exerted on the cylinders, and the vortex formation and deformation due to the wall effects. In this study, the VIC method [14,16] is employed to investigate the characteristics of the laminar flow around two side-by-side cylinders at Re ranging from 40 to 200. The vortex wakes of the flow are identified using the plots of the vorticity contours, and the characteristics of these wakes are analyzed by using plots of the drag and lift coefficients exerted on the cylinders.…”

Section: Introductionmentioning

confidence: 99%

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Archive of Mechanical Engineering

Nguyen,

2022

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The laminar flow around two side-by-side circular cylinders was numerically investigated using a vortex-in-cell method combined with a continuous-forcing immersed boundary method. The Reynolds number (Re) of the flow was examined in the range from 40 to 200, and the distance between the cylinders varies from 1.2D to 6D, where D is the cylinder diameter. Simulation results show that the vortex wake is classified into eight patterns, such as single-bluff-body, meandering-motion, steady, deflectedin-one-direction, flip-flopping, anti-phase-synchronization, in-phase-synchronization, and phase-difference-synchronization, significantly depending on the Re, the cylinder distance, and the initial external disturbance effects. The anti-phase-synchronization, in-phase-synchronization, and phase-difference-synchronization vortex patterns can be switched at a low Re after a long time evolution of the flow. In particular, the single-bluff-body and flip-flopping vortex patterns excite the oscillation amplitude of the drag and lift coefficients exerted on the cylinders.

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“…Thus, a host of experimental and numerical investigations has been carried out, during the last years, to understand the flow and heat transfer past of square cylinders, circular or any other geometric shapes of a cylinder in cross flows with or without a control plate (Abbasi et al, 2014;Dey, 2021;Dhiman et al, 2005;Doolan, 2009;Guo et al, 2020;Islam et al, 2015;Koutmos et al, 2004;Kumar et al, 2015;Rashidi et al, 2015;Rashidi et al, 2016;Sohankar et al, 2018;Turki, 2008;Vamsee et al, 2014). Nevertheless, few works have addressed the interference effects between multiple cylinders and the number of publications available becomes drastically smaller as the number of cylinders involved increases (Aboueian et al, 2017;Nazeer et al, 2019;Nguyen et al, 2021;Sumner, 2010;Tong et al, 2015). As well, there is very little investigation into the coupling between fluid flow and heat transfer around several cylinders Admi et al, 2020;Chatterjee et al, 2012;Moussaoui et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Convective Heat Transfer and Fluid Flow Past a Three Square Cylinders Controlled by a Partition in Channel

Admi

Moussaoui

Mezrhab

2022

Int. J. Renew. Energy Dev.

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In this paper, a numerical investigation was performed to simulate laminar flow and heat transfer characteristics in a two-dimensional horizontal channel, comprising three heated square cylinders placed side-by-side and controlled by a downstream detached partition. The Double Multiple Relaxation Time Lattice Boltzmann Method (MRT-LBM) is applied as the numerical method was using the MRT-D2Q9 model and the MRT-D2Q5 model to treat the flow and the temperature fields respectively. The problem considered is a laminar and incompressible flow. The air (Pr = 0.71) is the fluid circulating in the channel, its physical properties, except the density, are assumed to be constant. The top and bottom channel walls are supposed to be adiabatic, the airflow incoming with cold temperature which is fixed to θc = - 0.5, each cylinder at a constant hot temperature equal to θh= 0,5. The flow is fully developed with a parabolic velocity profile at the inlet and at the outlet of the channel. Also, in the outlet, the temperature and velocity gradients are assumed to be zero. The effects of horizontal and vertical plate position and length on the fluid flow and the heat transfer are examined in terms of streamlines and isotherms contours visualizations.

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Characteristics of the flow around four cylinders of various shapes

Cited by 14 publications

References 44 publications

Low order modeling of dynamic stall using vortex particle method and dynamic mode decomposition

Low order modeling of dynamic stall using vortex particle method and dynamic mode decomposition

Archive of Mechanical Engineering

Numerical Investigation of Convective Heat Transfer and Fluid Flow Past a Three Square Cylinders Controlled by a Partition in Channel

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