Prediction of the flow structure in a turbulent rectangular free jet

Berg, Jacob; Ormiston, S.J.; Soliman, H.M.

doi:10.1016/j.icheatmasstransfer.2006.02.007

Cited by 37 publications

(26 citation statements)

References 17 publications

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“…For comparison with the k-ε model results, the results of the present work were compared with the results of Berg et al [31]. In Fig.…”

Section: Influence Of Inlet Turbulence Intensitymentioning

confidence: 77%

“…In this research, we have used two-equational turbulence modeling to predict the main features of the flow, velocity profiles in the near-field region, and the rate of velocity decay in the far-field region. Berg et al [31] used two standard two-equation turbulence models (k-ε, k-ω) to simulate the flow of rectangular jet. It was found that the simulating method, which was based on the k-ε model, was the best in predicting the stream-wise velocity decay along the jet centerline in both the near-field and the far-field regions.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of turbulent free jet flows issuing from rectangular nozzles: the influence of small aspect ratio

et al. 2009

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In this research, the fluid and thermal characteristics of a rectangular turbulent jet flow is studied numerically. The results of three-dimensional jet issued from a rectangular nozzle are presented. A numerical method employing control volume approach with collocated grid arrangement was employed. Velocity and pressure fields are coupled with SIMPLEC algorithm. The turbulent stresses are approximated using k-ε model with two different inlet conditions. The velocity and temperature fields are presented and the rates of their decay at the jet centerline are noted. The velocity vectors of the main flow and the secondary flow are illustrated. Also, effect of aspect ratio on mixing in rectangular cross-section jets is considered. The aspect ratios that were considered for this work were 1:1 to 1:4. The results showed that the jet entrains more with smaller AR. Special attention has been drawn to the influence of the Reynolds number (based on hydraulic diameter) as well as the inflow conditions on the evolution of the rectangular jet. An influence on the jet evolution is found for smaller Re, but the jet is close to a converged state for higher Reynolds numbers. The inflow conditions have considerable influence on the jet characteristics.

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“…For comparison with the k-ε model results, the results of the present work were compared with the results of Berg et al [31]. In Fig.…”

Section: Influence Of Inlet Turbulence Intensitymentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Numerical investigation of turbulent free jet flows issuing from rectangular nozzles: the influence of small aspect ratio

et al. 2009

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“…It was found that the simulation method, which was based on the k-ε model and the velocity profile fitted to experiment of Quinn [26], was the best at predicting the streamwise velocity decay along the jet centerline in both the near-field and the far-field regions. But the results of Berg et al [22] show some deviation, especially in the spread of jet and the streamwise velocity profile at the near field of the inlet. Faghani et al [27,28] simulated the flow from different nozzle shapes.…”

mentioning

confidence: 88%

“…In the previous numerical simulations, velocity components have fitted to experimental measurements at the inlet region to simulate the flow field [21,22]. The effect of the other parameters on simulation of free jets has not been mainly considered in previous researches.…”

mentioning

confidence: 99%

“…Berg et al [22] used two standard, two-equation turbulence models (k-ε, k-ω) to simulate the flow of rectangular jets. It was found that the simulation method, which was based on the k-ε model and the velocity profile fitted to experiment of Quinn [26], was the best at predicting the streamwise velocity decay along the jet centerline in both the near-field and the far-field regions.…”

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confidence: 99%

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On the effect of inflow conditions in simulation of a turbulent round jet

et al. 2010

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This paper investigates the impact of the inflow conditions on simulations of a round jet discharging from a wall into a large space. The fluid dynamic characteristics of a round jet are studied numerically. A numerical method based on the control volume approach with collocated grid arrangement is employed. The k-ε model is utilized to approximate turbulent stresses by considering six different inlet conditions. The velocity field is presented, and the rate of decay at the jet centerline is determined. The results showed that inflow conditions had a strong influence on the jet characteristics. This paper also investigates both sharp-edged and contoured nozzles. The effects of velocity, turbulence intensity, turbulence kinetic energy, and turbulence dissipation rate on flow field characteristics are examined. Results showed that the present simulations in both types of nozzles are in good agreement with experiments when considering the appropriate inflow conditions. Keywords Free jet · Turbulent flow · Inflow conditions · k-ε model List of symbolsFunction of r which fitted to u in /u in,cl velocity measured from experiment G Function of r which fitted to v in /u in,cl velocity measured from experiment I Turbulence intensity J Function of r which fitted to axial turbulence intensity measured from experiment atReynolds number based on Hydraulic diameter u, v, w Time-averaged velocity components in the x and r direction (m s −1 ) √ u 2 , √ v 2 Root mean square of fluctuating velocity in x and r direction (m s −1 ) x, r , θ Cylindrical coordinate of domain r 1/2Half-velocity width in the r direction based on the u-velocity [u(r 1/2 ) = 1 2 u cl ] (m)

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Supersonic Jets

Kaushik¹

2018

Theoretical and Experimental Aerodynamics

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Prediction of the flow structure in a turbulent rectangular free jet

Cited by 37 publications

References 17 publications

Numerical investigation of turbulent free jet flows issuing from rectangular nozzles: the influence of small aspect ratio

Numerical investigation of turbulent free jet flows issuing from rectangular nozzles: the influence of small aspect ratio

On the effect of inflow conditions in simulation of a turbulent round jet

Supersonic Jets

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