scholarly journals Multigene Genetic-Programming-Based Models for Initial Dilution of Laterally Confined Vertical Buoyant Jets

2019 ◽  
Vol 7 (8) ◽  
pp. 246 ◽  
Author(s):  
Xiaohui Yan ◽  
Abdolmajid Mohammadian
Keyword(s):  
Genetic Programming ◽  
Empirical Equation ◽  
Single Gene ◽  
Compact Model ◽  
Pareto Optimal ◽  
Buoyant Jet ◽  
Buoyant Jets ◽  
New Approach ◽  
Initial Dilution ◽  
Multigene Genetic Programming

A new approach based on the multigene genetic-programming (MGGP) technique is proposed to predict initial dilution of vertical buoyant jets subjected to lateral confinement. The models are trained and tested using experimental data, and the good matches demonstrate the generalization and predictive capabilities of the evolved MGGP-based models. The best Pareto-optimal MGGP-based model is also compared with the model evolved using a single-gene genetic-programming (SGGP) algorithm and an existing regression-based empirical equation. The comparisons reveal the superiority of the MGGP-based model. This study confirms that the MGGP technique is promising in evolving an explicit, accurate, and compact model, and the developed models can be employed to estimate effectively and efficiently the dilution properties of a laterally confined vertical buoyant jet.

scholarly journals Simulations of the Concentration Fields of Rosette-Type Multiport Buoyant Discharges Using Combined CFD and Multigene Genetic Programming Techniques

2021 ◽  
Vol 9 (11) ◽  
pp. 1311
Author(s):  
Xiaohui Yan ◽  
Yan Wang ◽  
Abdolmajid Mohammadian ◽  
Jianwei Liu
Keyword(s):  
Genetic Programming ◽  
Three Dimensional ◽  
Buoyant Jets ◽  
Mixing Properties ◽  
Multigene Genetic Programming ◽  
Programming Techniques ◽  
Computationally Expensive ◽  
A New Technique ◽  
Prediction Efficiency ◽  
Buoyant Discharges

Rosette-type diffusers are becoming popular nowadays for discharging wastewater effluents. Effluents are known as buoyant jets if they have a lower density than the receiving water, and they are often used for municipal and desalination purposes. These buoyant effluents discharged from rosette-type diffusers are known as rosette-type multiport buoyant discharges. Investigating the mixing properties of these effluents is important for environmental impact assessment and optimal design of the diffusers. Due to the complex mixing and interacting processes, most of the traditional simple methods for studying free single jets become invalid for rosette-type multiport buoyant discharges. Three-dimensional computational fluid dynamics (3D CFD) techniques can satisfactorily model the concentration fields of rosette-type multiport buoyant discharges, but these techniques are typically computationally expensive. In this study, a new technique of simulating rosette-type multiport buoyant discharges using combined 3D CFD and multigene genetic programming (MGGP) techniques is developed. Modeling the concentration fields of rosette-type multiport buoyant discharges using the proposed approach has rarely been reported previously. A validated numerical model is used to carry out extensive simulations, and the generated dataset is used to train and test MGGP-based models. The study demonstrates that the proposed method can provide reasonable predictions and can significantly improve the prediction efficiency.

Model and Numerical Studies on Buoyant Jets in Crossflows: Yantai Marine Outfall System

1991 ◽  
Vol 24 (5) ◽  
pp. 175-181
Author(s):  
Guowei Gu ◽  
Heping Wei ◽  
Bute Cai
Keyword(s):  
Near Field ◽  
Model Tests ◽  
Buoyant Jet ◽  
Buoyant Jets ◽  
Integral Control ◽  
Initial Dilution ◽  
Numerical Studies ◽  
Model Research ◽  
Marine Outfall ◽  
Rise Height

The main object of this model research is to study the dilution and diffusion of buoyant jets in crossflows. Combining with a prototype project of municipal sewerage discharge for Yantai, the model tests were taken. Froude's law was used to design the model, and an undistorted model has been adopted. The length scale is taken as l:100. Six integral control equations were deduced, with which we can calculate initial dilution, rise height and spreading width of buoyant jet in the near field. According to model tests and calculated results of integral control equations, we suggest the essential parameters to be used in the diffuser project at Yantai.

Dynamic interaction of multiple buoyant jets

2012 ◽  
Vol 708 ◽  
pp. 539-575 ◽  
Author(s):  
Adrian C. H. Lai ◽  
Joseph H. W. Lee
Keyword(s):  
Stokes Equations ◽  
Dynamic Pressure ◽  
Unit Length ◽  
Iterative Solution ◽  
Scalar Fields ◽  
Passive Scalar ◽  
Dynamic Interaction ◽  
Ambient Conditions ◽  
Buoyant Jet ◽  
Buoyant Jets

AbstractAn array of closely spaced round buoyant jets interact dynamically due to the pressure field induced by jet entrainment. Mutual jet attraction can result in a significant change in jet trajectories. Jet merging also leads to overlapping of the passive scalar fields associated with the individual jets, resulting in mixing characteristics that are drastically different from those of an independent free jet. A general semi-analytical model for the dynamic interaction of multiple buoyant jets in stagnant ambient conditions is proposed. The external irrotational flow field induced by the buoyant jets is computed by a distribution of point sinks with strength equal to the entrainment per unit length along the unknown jet trajectories and accounting for boundary effects. The buoyant jet trajectories are then determined by an iterative solution of an integral buoyant jet model by tracking the changes in the external entrainment flow and dynamic pressure fields. The velocity and concentration fields of the jet group are obtained by momentum or kinetic energy superposition for merged jets and plumes, respectively. The modelling approach is supported by numerical solution of the Reynolds-averaged Navier–Stokes equations. The model shows that jet merging and mixing can be significantly affected by jet interactions. Model predictions of the multiple jet trajectories, merging height, as well as the centreline velocity and concentration of the buoyant jet group are in good agreement with experimental data for: (i) a clustered momentum jet group; (ii) a turbulent plume pair; and (iii) a rosette buoyant jet group. Dynamic interactions between a jet group are shown to decrease with the addition of an ambient cross-flow.

A New Approach to the Extraction of ANN Rules and to Their Generalization Capacity Through GP

2004 ◽  
Vol 16 (7) ◽  
pp. 1483-1523 ◽  
Author(s):  
Juan R. Rabuñal ◽  
Julián Dorado ◽  
Alejandro Pazos ◽  
Javier Pereira ◽  
Daniel Rivero
Keyword(s):  
Genetic Programming ◽  
Rule Extraction ◽  
Human Beings ◽  
Activation Functions ◽  
New Approach ◽  
Previous Algorithm ◽  
Internal Distribution

Various techniques for the extraction of ANN rules have been used, but most of them have focused on certain types of networks and their training. There are very few methods that deal with ANN rule extraction as systems that are independent of their architecture, training, and internal distribution of weights, connections, and activation functions. This article proposes a methodology for the extraction of ANN rules, regardless of their architecture, and based on genetic programming. The strategy is based on the previous algorithm and aims at achieving the generalization capacity that is characteristic of ANNs by means of symbolic rules that are understandable to human beings.

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