Channel flow past bluff-body: outlet boundary condition, vortex shedding and effects of buoyancy

Abbassi, H.; Turki, Saïd; Nasrallah, Sassi Ben

doi:10.1007/s004660100261

Cited by 25 publications

(14 citation statements)

References 14 publications

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“…The inlet velocity profile is parabolic while the exit boundary conditions are chosen to minimize the distortion of the unsteady vortices shed from the cylinder and to reduce perturbations that reflect back in to the domain. A detailed investigation carried out by Abbassi et al (2002) show that the convective boundary condition (CBC) given by:…”

Section: Governing Equationsmentioning

confidence: 99%

Effect of the blockage ratio on the flow in a channel with a built-in square cylinder

Turki¹,

Abbassi²,

Nasrallah³

2003

Computational Mechanics

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The structures wakes behind a square cylinder in a laminar channel flow is conducted numerically. The Strouhal number, drag and lift coefficients were studied in a periodic flow for different blockage ratios b ¼ 1=4; 1=6 and 1=8 at Reynolds number ranging from 62 to 300. The governing equations are solved by using control volume finite element method (CVFEM) adapted to the staggered grid. The SIMPLER algorithm is used for the velocitypressure coupling. The critical Reynolds numbers corresponding to the onset of vortex shedding and its change from simple periodic to complex periodic motion are established. A discussion about the effect of the blockage ratio on the Strouhal number, the time-averaged drag coefficient and the amplitude of the lift coefficient is also presented.

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Section: Governing Equationsmentioning

confidence: 99%

Effect of the blockage ratio on the flow in a channel with a built-in square cylinder

Turki¹,

Abbassi²,

Nasrallah³

2003

Computational Mechanics

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“…It is noted here that, as mentioned by Sohankar et al [22] and Abbassi et al [23], the convective boundary condition reduces the number of iterations per time step and allows a shorter downstream computational domain when compared to the case of the Neumann boundary condition. The square obstacle is assumed to be isothermally heated at ℎ , exchanging heat to the fluid flowing around it.…”

Section: Governing Equationsmentioning

confidence: 69%

Heat Transfer Enhancement in a Backward-Facing Step with Heated Obstacle Using Nanofluid

Bouazizi¹

2018

Int. J. Automot. Mech. Eng.

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A numerical investigation was conducted to analyze the effect of the presence of a square obstacle placed behind the first primary recirculation zone on the flow field and heat transfer over a backward-facing step using copper-water nanofluid. Computations were performed over a range of Richardson number from 0 to 2.85 and volume fraction of nanoparticles φ from 0 to 15% at a fixed Reynolds number Re = 450 and Prandtl number Pr = 6.2. A discussion about the buoyancy effect on the heat transfer exchanged between the horizontal walls of the channel as well as on the heat flux transferred from the obstacle to the flow for different φ. Results show that, the presence of heated square obstacle is effective in augmenting the heat transfer. In fact, in presence of the square obstacle, enhancements in the maximum values of the Nusselt number of 194% and 153% are obtained at the lower and the upper walls of the channel, respectively. Furthermore, the heat transfer reaches its maximum at the emplacement of the square cylinder. On the other hand, results show a marked improvement in heat transfer compared to the base fluid. This improvement is more pronounced for higher and φ. Finally, the effect of the buoyancy forces is found less important on the heat transfer enhancements when Ri increases. This can be explained by the thermophoresis forces effect near the hot walls of the obstacle.

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“…Previous studies also yielded the relation of the recirculation length varying with Re for squares [10,11] and triangulars [12], as well as the linear relation of vortex shedding frequency, St , varying with 1/2 Re  for squares and triangles [13]. For the inviscid flow past polygonal obstacles, we also found studies for pure potential flow [14] and the vortex flow [15,16].…”

Section: Introductionmentioning

confidence: 77%

“…(13), which involves the equivalent Reynolds number, to study the features of viscous flow past odd-sided polygons, including the 1st critical Reynolds numbers and flow patterns. In this paper, we only consider the polygon whose rear stagnation point coincides with one of its apices.…”

Section: Viscous Flow Past Polygonsmentioning

confidence: 99%

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Flow past polygons with an odd number of edges

Tian

Hong-tao

2011

Sci. China Phys. Mech. Astron.

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Channel flow past bluff-body: outlet boundary condition, vortex shedding and effects of buoyancy

Cited by 25 publications

References 14 publications

Effect of the blockage ratio on the flow in a channel with a built-in square cylinder

Effect of the blockage ratio on the flow in a channel with a built-in square cylinder

Heat Transfer Enhancement in a Backward-Facing Step with Heated Obstacle Using Nanofluid

Flow past polygons with an odd number of edges

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