Three-Dimensional Numerical Simulations of Buoyant Jets Discharged from a Rosette-Type Multiport Diffuser

Yan, Xiaohui; Mohammadian, Abdolmajid; Chen, Xin

doi:10.3390/jmse7110409

Cited by 25 publications

(15 citation statements)

References 41 publications

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“…Very recently, [73] published a paper on 3D numerical simulations of rosette multiport diffusers using two RANS models: standard k-ε and RNG k-ε turbulence models. They used the popular OpenFOAM model for this study.…”

Section: Discharge Port Configurationmentioning

confidence: 99%

“…Ref. [73] also appreciated that the computational cost of using the RNG k-ε turbulence model is almost the same as that of standard k-ε turbulence model, while models such as LES and DNS will increase the computational cost dramatically.…”

mentioning

confidence: 99%

“…The main reason that the present available CFD models have not been applied to the modeling of multiport diffusers could be attributed to the difficulties in the mesh generation and stability of such models. However, it seems that with the work of [73], there will be more CFD modeling of such cases in the near future.…”

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confidence: 99%

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CFD Modeling of Effluent Discharges: A Review of Past Numerical Studies

Mohammadian

Gildeh

Nistor

2020

Water

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Effluent discharge mixing and dispersion have been studied for many decades. Studies began with experimental investigations of geometrical and concentration characteristics of the jets in the near-field zone. More robust experiments were performed using Laser-Induced Fluorescence (LIF) and Particle Image Velocimetry (PIV) systems starting in the 20th century, which led to more accurate measurement and analysis of jet behavior. The advancement of computing systems over the past two decades has led to the development of various numerical methods, which have been implemented in Computational Fluid Dynamics (CFD) codes to predict fluid motion and characteristics. Numerical modeling of mixing and dispersion is increasingly preferred over laboratory experiments of effluent discharges in both academia and industry. More computational resources and efficient numerical schemes have helped increase the popularity of using CFD models in jet and plume modeling. Numerous models have been developed over time, each with different capabilities to facilitate the investigation of all aspects of effluent discharges. Among these, Reynolds-averaged Navier-Stokes (RANS) and Large Eddy Simulations (LES) are at present the most popular CFD models employing effluent discharge modeling. This paper reviews state-of-the-art numerical modeling studies for different types and configurations of discharges, including positively and negatively buoyant discharges, which have mostly been completed over the past two decades. The numerical results of these studies are summarized and critically discussed in this review. Various aspects related to the impact of turbulence models, such as k-ε and Launder-Reece-Rodi (LRR) models, are reviewed herein. RANS and LES models are reviewed, and implications for the simulation of jet and plume mixing are discussed to develop a reference for future researchers performing numerical investigations on jet mixing and dispersion.

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Section: Discharge Port Configurationmentioning

confidence: 99%

mentioning

confidence: 99%

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CFD Modeling of Effluent Discharges: A Review of Past Numerical Studies

Mohammadian

Gildeh

Nistor

2020

Water

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“…The characteristics of mixing and dispersion of the effluents from ocean outfalls have been extensively studied experimentally and numerically for many decades [6]. Examples of experimental and lab works are [7][8][9], and numerical studies include [6,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Drainage of a Water Tank with Pipe Outlet Loaded by a Passive Rotor

Elgamal

Kriaa

Farouk

2021

Water

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The optimal design of pipe outlets is an essential objective for many engineering projects. For the first time, this paper reports the results of a laboratory investigation on the effect of using a passive rotor (added at the pipe outlet) on the outlet performance. Different sizes and numbers of blades of rotors were considered. Through the Tracker software package, video and image processing techniques were applied to capture the temporal variations of the tank water depth and the passive rotor’s angular speed. In addition, a normalized average drainage rate (NADR) parameter is defined to quantify the changes in the tank drainage rate as a result of passive rotor utilization. It is noted that adding a 4-bladed symmetric passive rotor will increase NADR by up to 9.0%. The study also shows that the highest increase in NADR is attained when the rotor diameter size is approximately 1.73 times the pipe outlet’s diameter for the case of symmetric 4-blade rotors, and the corresponding average tip rotor speed ratio is 1.65. It is also found that using an asymmetric 3-blade rotor has a negative impact on the NADR due to the significant perturbation produced by the rotor asymmetry.

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“…The heavy jets, caused by the high difference in density between the jet and surrounding fluid, were investigated by some authors to study the mixing characteristics of wastewater discharge [16,17]. However, there are many industrial applications that contain the discharging process of heavy particles and fluid, which form heavy jets.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Horizontal Motion of Particle-Laden Jets

2020

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Particle-laden jet flows can be observed in many industrial applications. In this investigation, the horizontal motion of particle laden jets is simulated using the Eulerian–Lagrangian framework. The two-way coupling is applied to the model to simulate the interaction between discrete and continuum phase. In order to track the continuum phase, a passive scalar equation is added to the solver. Eddy Life Time (ELT) is employed as a dispersion model. The influences of different non-dimensional parameters, such as Stokes number, Jet Reynolds number and mass loading ratio on the flow characteristics, are studied. The results of the simulations are verified with the available experimental data. It is revealed that more gravitational force is exerted on the jet as a result of the increase in mass loading, which deflects it more. Moreover, with an increase in the Reynolds number, the speed of the jet rises, and consequently, the gravitational force becomes less capable of deviating the jet. In addition, it is observed that by increasing the Stokes number, the particles leave the jet at higher speed, which causes a lower deviation of the jet.

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Three-Dimensional Numerical Simulations of Buoyant Jets Discharged from a Rosette-Type Multiport Diffuser

Cited by 25 publications

References 41 publications

CFD Modeling of Effluent Discharges: A Review of Past Numerical Studies

CFD Modeling of Effluent Discharges: A Review of Past Numerical Studies

Drainage of a Water Tank with Pipe Outlet Loaded by a Passive Rotor

Investigation of the Horizontal Motion of Particle-Laden Jets

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