Evolutionary prediction of multiple vertical buoyant jets in stationary ambient water

Yan, Xiaohui; Mohammadian, Abdolmajid

doi:10.5004/dwt.2020.24938

Cited by 7 publications

(4 citation statements)

References 37 publications

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“…Third, applying the previous models to complicated practical cases is not feasible. Although Yan and Mohammadian [18][19][20] have demonstrated the capability of the multi- The downward-inclined buoyant jets behaved like reversed upward-inclined dense jets. In the initial dilution region where the jets were falling, the vertical velocities of the jets decreased because of the buoyancy effects and momentum transfer between the fluids.…”

Section: Discussionmentioning

confidence: 99%

“…Third, applying the previous models to complicated practical cases is not feasible. Although Yan and Mohammadian [18][19][20] have demonstrated the capability of the multi-gene genetic programming approach for wastewater jets, numerical simulations are still necessary to provide reliable data for model training and validation. It should be noted that the AI-based models may provide comparable or even better predictions than numerical models within the range of the training data, but their predictions out of the training range should be used with caution.…”

Section: Discussionmentioning

confidence: 99%

“…However, the uncertain parameters, such as the contraction coefficient, involved in the model may result in unacceptable uncertainties, and utilizing the model for complicated cases may not be feasible. Recently, Yan and Mohammadian have successfully utilized an artificial intelligence approach based on multi-gene genetic programming for buoyant jets subjected to lateral confinement [18], multiple inclined dense jets [19], and multiple vertical buoyant jets [20]. However, it has been stated by the authors that this type of model requires extensive reliable data for further training and generalization.…”

Section: Introductionmentioning

confidence: 99%

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

Yan

Mohammadian

Chen

2019

JMSE

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In some outfall systems, wastewaters are discharged into ambient water bodies using rosette-type diffusers in the form of multiple buoyant jets, and it is essential to simulate their mixing characteristics for practical applications and optimal design purposes. The mixing processes of a rosette jet group are more complicated than single jets and multiple horizontal or vertical jets, and thus the existing methods cannot be effectively used to simulate their mixing and dilution properties. With the recent advancements in numerical modeling approaches, numerical simulation of wastewater jets as three-dimensional phenomena can be feasible. The present study deals with a fully three-dimensional numerical simulation for buoyant jets discharged from a rosette-type multiport diffuser, with the standard and re-normalization group (RNG) k-ε turbulence models. The simulated results are compared with experimental data, and the results show a good agreement with the experimental data, demonstrating that the numerical model is an efficient and effective tool for simulating rosette jet groups. It was also concluded that the RNG k-ε model leads to better results than the standard k-ε model with a comparable computational cost. The validated model was further utilized to investigate the influences of port inclinations on the mixing behaviors.

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Section: Discussionmentioning

confidence: 99%

“…Third, applying the previous models to complicated practical cases is not feasible. Although Yan and Mohammadian [18][19][20] have demonstrated the capability of the multi-gene genetic programming approach for wastewater jets, numerical simulations are still necessary to provide reliable data for model training and validation. It should be noted that the AI-based models may provide comparable or even better predictions than numerical models within the range of the training data, but their predictions out of the training range should be used with caution.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Yan

Mohammadian

Chen

2019

JMSE

Self Cite

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“…Artificial intelligence (AI) techniques have recently shown great potential for modeling and solving complex nonlinear water and marine engineering problems [128][129][130][131][132][133][134][135][136]. Thus, extensive and promising datasets obtained from experimental and CFD research efforts on buoyant JICFs can be employed in future AI studies.…”

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confidence: 99%

Buoyant Jets in Cross-Flows: Review, Developments, and Applications

Taherian

Mohammadian

2021

JMSE

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Significant environmental effects from the use of marine outfall discharges have led to increased efforts by both regulatory bodies and research groups to minimize the negative impacts of discharges on the receiving water bodies. Understanding the characteristics of discharges under conditions representative of marine environments can enhance the management of discharges and mitigate the adverse impacts to marine biota. Thus, special attention should be given to ambient cross-flow effects on the mixing behaviors of jet discharges. A buoyant jet in cross-flow has different practical applications such as film cooling and dilution, and provide a higher mixing capability in comparison with free jets or discharges into stationary environments. The main reason for this is believed to be the existence of various complicated vortical structures including a counter-rotating vortex pair as the jet expands downstream. Although tremendous research efforts have been devoted to buoyant jets issuing into cross-flows over the past five decades, the mixing process of an effluent at the discharge point is not yet well understood because of the highly complex fluid interactions and dispersion patterns involved. Therefore, there is a need for a deeper understanding of buoyant jets in cross-flows in order to obtain better predictive methods and more accurate design guidelines. The main aims of this study were (i) to establish the background behind the subject of buoyant jets in cross-flows including the flow structures resulting from the interaction of jets and cross-flows and the impacts of current on mixing and transport behavior; (ii) to present a summary of relevant experimental and numerical research efforts; and finally, (iii) to identify and discuss research gaps and future research directions.

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Overview of Outfall Discharge Modeling with a Focus on Turbulence Modeling Approaches

Taherian¹,

Hosseini²,

Mohammadian³

2022

Forum for Interdisciplinary Mathematics

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Evolutionary prediction of multiple vertical buoyant jets in stationary ambient water

Cited by 7 publications

References 37 publications

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

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

Buoyant Jets in Cross-Flows: Review, Developments, and Applications

Overview of Outfall Discharge Modeling with a Focus on Turbulence Modeling Approaches

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