Characteristics of Flow past a Square Cylinder using the Lattice Boltzmann Method

Ul-Islam, Shams; Zhou, Chao

doi:10.3923/itj.2009.1094.1114

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…During the past few decades, investigations about flow around bluff bodies have always been a hot topic in computational fluid dynamics, not just in theoretical studies but also in practical applications. Specifically, the circular and square cylinders under laminar flow conditions, see references [1][2][3] and [4][5][6][7][8][9][10][11] respectively, were well studied for more than a half century using both experimental and computational means. Tritton [1] launched some experiments about flow around a circular cylinder at low Reynolds numbers ranging from 0.5 to 100, the body forces were measured and the vortex shedding process was also captured.…”

Section: Passive Flow Control Of the Flow Over A Square Cylindermentioning

confidence: 99%

“…They concluded that the vortex formation mechanism in circular and square cylinders was the same, due to the similar vortical structures they observed between corresponding modes for these two bluff bodies. In 2009, Ul-Islam and Zhou [10] investigated the flow around a square cylinder at Reynolds number 100 via using the lattice Boltzmann method, the aim was to determine the influence of the different boundary conditions on the downstream flow characteristics. In the same year, Ali et al [11] conducted a grid convergence study for 2D flow around a square cylinder at Reynolds number 150.…”

Section: Passive Flow Control Of the Flow Over A Square Cylindermentioning

confidence: 99%

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Numerical investigation on the flow around a square cylinder with an upstream splitter plate at low Reynolds numbers

Bergadà

Mellibovsky

et al. 2020

Meccanica

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The present study focuses on the flow over a 2D square cylinder, with a plate placed in front of it. An inhouse code using the lattice Boltzmann method (LBM) was employed for all the simulations presented. Few cases were simulated using the open source code Nektar++, the results obtained from both methodologies were compared. Regarding the plate, three related parameters, velocity ratio, distance between the plate and cylinder, and the thickness of the plate, were studied in order to evaluate the impact of these parameters on the flow behavior. The interactions between these parameters were as well investigated. The POD technology was also employed to predict the flow behavior based on the existing information. It turned out the POD technology is a trustable methodology to mathematically pre-investigate the flow field, therefore it is capable of saving large computational resources. From the present results predicted by the POD technology, it was observed that the number of the existing modes has a crucial impact on the results, the higher the number of modes, the better the predicted results.

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Section: Passive Flow Control Of the Flow Over A Square Cylindermentioning

confidence: 99%

Section: Passive Flow Control Of the Flow Over A Square Cylindermentioning

confidence: 99%

Numerical investigation on the flow around a square cylinder with an upstream splitter plate at low Reynolds numbers

Bergadà

Mellibovsky

et al. 2020

Meccanica

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“…Previous studies have highlighted how changing these parameters can lead to different flow regimes, with a significant impact on fluid forces, vortex shedding, and flow structures [1][2][3][4][5][6][7][8][9][10]. Hamane et al [1] investigated the vorticity structures in a circular cylinder's wake at different Reynolds numbers of 20, 40, 100, and 3000 using the lattice Boltzmann method (LBM).…”

Section: Introductionmentioning

confidence: 99%

“…The location of the separation point moved gradually to the front edges as the Re value increased. Islam et al [7] systematically inspected the influence of the locations of domain boundaries on the flow past a square cylinder with a Re value of 100. They found that with the placement of the cylinder nearer to the inlet boundary location, the physical quantities such as the mean drag coefficient (CD mean ), the root mean square value of the lift coefficient (CL rms ), and the St reached their maxima.…”

Section: Introductionmentioning

confidence: 99%

Rectangular Cylinder Orientation and Aspect Ratio Impact on the Onset of Vortex Shedding

Tahir,

Abbasi,

Rahman

et al. 2023

Mathematics

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Rectangular cylinders have the potential to provide valuable insights into the behavior of fluids in a variety of real-world applications. Keeping this in mind, the current study compares the behavior of fluid flow around rectangular cylinders with an aspect ratio (AR) of 1:2 or 2:1 under the effect of the Reynolds number (Re). The incompressible lattice Boltzmann method is used for numerical computations. It is found that the flow characteristics are highly influenced by changes in the aspect ratio compared to the Reynolds number. The flow exhibits three different regimes: Regime I (steady flow), Regime II (initial steady flow that becomes unsteady afterward), and Regime III (completely unsteady flow). In the case of the cylinder with an aspect ratio of 2:1, vortex generation, variation in drag, and the lift coefficient occur much earlier at very low Reynolds numbers compared to the cylinder with an aspect ratio of 1:2. For the cylinder with an aspect ratio of 1:2, the Reynolds number ranges for Regimes I, II, and III are 1 ≤ Re ≤ 120, 121 ≤ Re ≤ 144, and 145 ≤ Re ≤ 200, respectively. For the cylinder with an aspect ratio of 2:1, the Reynolds number ranges for Regimes I, II, and III are 1 ≤ Re ≤ 24, 25 ≤ Re ≤ 39, and 40 ≤ Re ≤ 200, respectively. The cylinder with an aspect ratio of 1:2 is found to have the ability to stabilize the incoming flow due to its extended after-body flatness. Generally, it has been found that a cylinder with an AR of 2:1 is subjected to higher pressures, higher drag forces, higher curvatures of cross-flow rotations, and higher amplitudes of flow-induced drag, as well as higher lift coefficients and lower shedding frequencies, compared to cylinders with an AR of 1:2. In Regime III, elliptic and vertically mounted airfoil-like flow structures are also observed in the wake of the cylinders.

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“…Due to its mesoscopic nature, the LB method has many exceptional qualities involving high computational performance, not having mesh tangling and easy implements for complex fluid-solid boundary conditions which have made it highly appropriate for fluid dynamics and heat transfer analyses of the flow around structures including any number of cylinders with any cross-section shape and arrangement. Accordingly, many researchers have used this method to study the fluid mechanics of the flow around structures including one [1][2][3][4], two [5][6][7][8] and recently more than two cylinders [9,10]. In contrast to this wide usage, only a few researchers have applied the LB approach to study the heat transfer of the flow around cylindrical structures which are reviewed comprehensively in the following part.…”

Section: Introductionmentioning

confidence: 99%

LB simulation of heat transfer in flow past a square unit of four isothermal cylinders

Esfahani

Vasel-Be-Hagh

2012

Comptes Rendus. Mécanique

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The lattice Boltzmann method is applied to simulate heat transfer in flow past a square unit of four circular cylinders which its spacing ratio is fixed at L/D = 2. The cylinders are isothermal and also equal-diameter. The simulation is carried out at a fixed Prandtl number of 0.71, however, the Reynolds number takes three different values; Re = 80, 120 and 200.The D2Q9 model is chosen to simulate fluid flow and the D2Q5 model is employed to simulate heat transfer. It is found that the predictions from the present simulation are excellently in accordance with results obtained from finite element solution of Navier-Stokes and energy equation.

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Characteristics of Flow past a Square Cylinder using the Lattice Boltzmann Method

Cited by 11 publications

References 21 publications

Numerical investigation on the flow around a square cylinder with an upstream splitter plate at low Reynolds numbers

Numerical investigation on the flow around a square cylinder with an upstream splitter plate at low Reynolds numbers

Rectangular Cylinder Orientation and Aspect Ratio Impact on the Onset of Vortex Shedding

LB simulation of heat transfer in flow past a square unit of four isothermal cylinders

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