Numerical Modeling of Submerged Hydraulic Jump from a Sluice Gate

Gümüş, Veysel; Şimşek, Oğuz; Soydan, N. Göksu; Aköz, M. Sami; Kırkgöz, M. Salih

doi:10.1061/(asce)ir.1943-4774.0000948

Cited by 40 publications

(26 citation statements)

References 15 publications

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“…It should be noted that considerable scattered points are shown in this figure due to the low accuracy of PIV in the wall-normal direction as described by Law and Herlian [11]. To further compare the present observations with analytical and previous results, a quantitative evaluation method with mean absolute relative error (MARE [35]) was used in the present study. The MARE is written as:…”

Section: Mean Velocity Profilesmentioning

confidence: 78%

Experimental Investigation on Mean Flow Development of a Three-Dimensional Wall Jet Confined by a Vertical Baffle

Chen

Huang

Zhang

et al. 2019

Water

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Three-dimensional (3D) confined wall jets have various engineering applications related to efficient energy dissipation. This paper presents experimental measurements of mean flow development for a 3D rectangular wall jet confined by a vertical baffle with a fixed distance (400 mm) from its surface to the nozzle. Experiments were performed at three different Reynolds numbers of 8333, 10,000 and 11,666 based on jet exit velocity and square root of jet exit area (named as B), with water depth of 100 mm. Detailed measurements of current jet were taken using a particle image velocimetry technique. The results indicate that the confined jet seems to behave like an undisturbed jet until 16B downstream. Beyond this position, however, the mean flow development starts to be gradually affected by the baffle confinement. The baffle increases the decay and spreading of the mean flow from 16B to 23B. The decay rate of 1.11 as well as vertical and lateral growth rates of 0.04 and 0.19, respectively, were obtained for the present study, and also fell well within the range of values which correspond to the results in the radial decay region for the unconfined case. In addition, the measurements of the velocity profiles, spreading rates and velocity decay were also found to be independent of Reynolds number. Therefore, the flow field in this region appears to have fully developed at least 4B earlier than the unconfined case. Further downstream (after 23B), the confinement becomes more pronounced. The vertical spreading of current jet shows a distinct increase, while the lateral growth was found to be decreased significantly. It can be also observed that the maximum mean velocity decreases sharply close to the baffle.

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Section: Mean Velocity Profilesmentioning

confidence: 78%

Experimental Investigation on Mean Flow Development of a Three-Dimensional Wall Jet Confined by a Vertical Baffle

Chen

Huang

Zhang

et al. 2019

Water

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“…Table 3 shows the result of middle point (x,y,z)=(10.5, 31,1127) in the upstream section of Y=31m and Table 4 shows all the results in all the three sections. It can be noticed that the maximum GCI value among all the points ranges from 0.66% to 1.41% and stays within 2%, which is very acceptable for numerical verification of computed results [20,30]. Therefore, it can be decided that the grid-independent solution has been achieved and there is no need for further refinement for grid size.…”

Section: Grid Sensitivity Analysismentioning

confidence: 83%

“…Usually, all the above mentioned turbulence models are quite accurate and valid only to fully turbulent flows. But near the wall, the flow is almost laminar and the turbulent stress hardly works, especially for the viscous sublayer region [20,21]. The traditional turbulence models do not work well here.…”

Section: Initial Boundary Conditionmentioning

confidence: 96%

“…Then the second step is to determine the advecting amount of water through each face based on the normal and tangential velocity distribution on the cell. The last step is to determine the volume fraction in each cell with the balance of mass fluxes calculated in previous step [20,27].…”

Section: Computation Of the Free Watermentioning

confidence: 99%

“…Following the procedure of Roache [28] and Celik et al [29], a Grid Convergence Index (GCI) is applied into the numerical simulation to determine the velocity results for three different grid sizes. Such method has proved to be a reliable technique for the discretization uncertainty analysis [20]. The fine GCI can be defined as following:…”

Section: Grid Sensitivity Analysismentioning

confidence: 99%

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Numerical Modeling of 3D Flow Field among a Compound Stilling Basin

Zhao

Wang

2019

Mathematical Problems in Engineering

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Due to great velocity gradients among the outgoing flow, it is much common to form large-scale reverse flow with oblique movements outside the conventional separated stilling basin. Aimed at above problems, this paper proposes to remove the longitudinal splitter wall and then physically and numerically investigate the corresponding influence upon the compound stilling basin. The standard k-ε, renormalization group k-ε, realizable k-ε, and large eddy simulation turbulence models are all employed to reveal downstream three-dimensional flow field. Experimental validation of numerical results shows that the renormalization group k-ε turbulence model is the most successful in predicting the flow field among the four models. Both methods prove that the removed splitter wall exerts great impact upon downstream stilling basin. In view of the removed splitter wall, discharging inflow would greatly diffuse to form a typical three-dimensional (3D) hydraulic jump with large-scale reverse flow. High energy dissipation region and high turbulent kinetic energy region are both moved upstream. Thus, the velocity decay among the discharging flow in the compound stilling basin is significantly enhanced. Compared to the separated stilling basin, the maximum velocity and average velocity of the outgoing flow, respectively, decrease more than 30%, and 20% in the compound stilling basin. Additionally, the velocity gradients between the left and the right outgoing flow reduce by over 65% with turbulent kinetic energy gradients almost down to zero. The outgoing flow from the compound stilling basin becomes much uniform with the phenomenon of obliquely moving flow totally eliminated.

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