Performance of two equation turbulence models for prediction of flow and heat transfer over a wall mounted cube

Ratnam, G. S. Venkata; Vengadesan, S.

doi:10.1016/j.ijheatmasstransfer.2007.09.029

Cited by 41 publications

(6 citation statements)

References 19 publications

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“…Schmidt and Thiele [21] compared the results of DES with LES on flow over wall mounted cube at different RANS models. SeetaRatnam and Vengadesan [22] investigated of flow and heat transfer over wall mounted cube with several RANS models.…”

Section: Introductionmentioning

confidence: 99%

Convective heat transfer over a wall mounted cube at different angle of attack using large eddy simulation

Heidarzadeh¹,

Farhadi²,

Sedighi³

2014

THERM SCI

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Turbulent fluid flow and convective heat transfer over the wall mounted cube in different flow angle of attack have been studied numerically using large eddy simulation. Cube faces and plate have a constant heat flux. Dynamic Smagorinskysubgrid scale model were used in this study. Angles were in the range 0≤θ≤45° and Reynolds number based on the cube height and free stream velocity was 4200. The numerical simulation results were compared with the experimental data of Nakamura et al. Characteristics of fluid flow field and heat transfer compared for four angles of attack. Flow around the cube was classified to four regimes. Results was represented in the form of time averaged normalized streamwise velocity and Reynolds stress in different positions, temperature contours, local and average Nusselt number over the faces of cube. Local convective heat transfer on cube faces was affected by flow pattern around the cube. The local convective heat transfer from the faces of the cube and plate are directly related to the complex phenomena such as horse shoe vortex, arch vortexes in behind the cube, separation and reattachment. Results show that overall convective heat transfer of cube and mean drag coefficient have maximum and minimum value at θ = 0 and θ = 25°, respectively.

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Section: Introductionmentioning

confidence: 99%

Convective heat transfer over a wall mounted cube at different angle of attack using large eddy simulation

Heidarzadeh¹,

Farhadi²,

Sedighi³

2014

THERM SCI

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“…By substituting equations (18), (20), (22), (24), and (26) into equations (6), (8), (9), (10), and (11), and noting that w u , w T , w k , w ε , and w p are arbitrary, we then obtain Next, by substituting equations (17), (19), (21), (23), and (25) into equations (27), (28), (29), (30), and (31), we have…”

Section: ∂ρ ∂Tmentioning

confidence: 99%

“…The wind tunnel experiments of thermal effects on flow within and above urban street canyons were performed [4][5][6], and the convective heat transfer in street canyons was investigated numerically [7,8]. The numerical simulations of heat transfer based on kε turbulence model were studied [9,10], and thermal effects on fluid-dynamic in an urban street canyon were analyzed [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effects of the wind speeds on heat transfer in a street canyon with a skytrain station

2019

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The street under a skytrain station can be seen in many urban cities. Due to the cavity geometry of the street canyon, natural ventilation is decreased. The reduction of the ventilation causes the heat accumulation in the street canyon. To keep the thermal climate at an acceptable level in the street canyon, controlling the air movement with proper temperature is important. In this paper, mathematical models of air flow and heat transfer in the skytrain street canyon are developed. The governing equations are the Reynolds-averaged Navier-Stokes equations and the energy equation. Finite element method is applied for the solution of the problem. The effect of wind speeds on temperature distribution in the street canyon is investigated. Three levels of wind speed including gentle, moderate, and strong wind speeds are chosen in this study. The results indicate that our model can capture the air flow and temperature distribution within a street canyon with a skytrain station.

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“…The realizable k-model is adopted in the turbulence model, which is widely used in engineering and other applied sciences (Hargreaves & Wright, 2007;Seeta Ratnam & Vengadesan, 2008). Compared with the standard k-turbulence model, the main difference of the realizable k-model is the increase in the calculation of turbulent viscosity and the transfer equation that changes the diffusion rate.…”

Section: Realizable K-turbulence Modelmentioning

confidence: 99%

Three-dimensional fluid-solid coupling heat transfer simulation based on the multireference frame for a side-blown aluminum annealing furnace

Qiu

Feng

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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In this study, a three-dimensional (3D) numerical simulation model for the flow and heat transfer in a side-blown aluminum annealing furnace (SAAF) is successfully established. Based on the vivid evolutions of the flow field and temperature field, it is confirmed that multiple vortices among the radially distributed nozzles play a key role in reducing the interior flow resistance of the SAAF. The simulated flow distribution agrees remarkably well with the on-site experimental data, which reveals that the model based on the multireference frame method is suitable for describing the 3D fluid-solid coupling heat transfer process inside the SAAF. In addition, to resolve the appreciably uneven temperature distribution in the SAAF, a scheme of guide plate arrangement around the fan is developed to adjust the flow pattern and facilitate the reasonable allocation of the nozzle flow. The standard deviation and the coefficient of variation are obviously declined (∼ 12%) for both low and standard airspeeds, thereby suggesting that the uniformity of the nozzle flow distribution are expectedly improved. The progress made so far is a substantial step toward achieving high quality, high efficiency and energy savings in aluminum production.

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Performance of two equation turbulence models for prediction of flow and heat transfer over a wall mounted cube

Cited by 41 publications

References 19 publications

Convective heat transfer over a wall mounted cube at different angle of attack using large eddy simulation

Convective heat transfer over a wall mounted cube at different angle of attack using large eddy simulation

Effects of the wind speeds on heat transfer in a street canyon with a skytrain station

Three-dimensional fluid-solid coupling heat transfer simulation based on the multireference frame for a side-blown aluminum annealing furnace

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