Numerical investigation of corner angle and wing number effects on fluid flow characteristics of a turbulent stellar jet

Faghani, Ehsan; Saemi, Simin Dokht; Maddahian, Reza; Farhanieh, Bijan

doi:10.1007/s00231-009-0541-6

Cited by 2 publications

(2 citation statements)

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“…Also it should be mentioned that the experiment of Quinn [1] and Quinn and Militzer [21] does not have the same Reynolds number ( [1] in Re = 1.84 × 10 5 and [21] in Re = 2.08 × 10 5 ). This is supported by Malmstrom et al [36], Mi et al [37] and Faghani et al [27,28] who showed that the mean flow quantities are independent of Reynolds number for the Reynolds numbers higher than a critical value. Figure 9 shows the decay of mean streamwise velocity along the centerline for a contoured nozzle in the near-field region.…”

Section: Contoured Nozzlementioning

confidence: 56%

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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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Section: Contoured Nozzlementioning

confidence: 56%

“…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. In this research, higher turbulence intensity was used to simulate flow through a sharp-edged nozzle.…”

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confidence: 99%