Jader Lugon Junior

Assessment of dispersion mechanisms in rivers by means of an inverse problem approach

In the present work the dispersion mechanisms in rivers are studied. The related direct and inverse problems are formulated and solved. The direct problem is solved by the finite volume method and the inverse problem by the Levenberg–Marquardt method.

Application of Simulated Annealing and Hybrid Methods in the Solution of Inverse Heat and Mass Transfer Problems

Antonio Jose da Silva Neto1, Jader Lugon Junior2,5, Francisco Jose da Cunha Pires Soeiro1, Luiz Biondi Neto1, Cesar Costapinto Santana3, Fran Sergio Lobato4 and Valder Steffen Junior4 Universidade do Estado do Rio de Janeiro1, Instituto Federal de Educacao, Ciencia e Tecnologia Fluminense2, Universidade Estadual de Campinas3, Universidade Federal de Uberlândia4, Centro de Tecnologia SENAI-RJ Ambiental5 Brazil

Solution of porous media inverse drying problems using a combination of stochastic and deterministic methods

In the present work the inverse problem of simultaneous heat and mass transfer modeled by Luikov equations is studied using a hybrid combination of the Levenberg-Marquardt (LM), Simulated Annealing (SA) and Artificial Neural Network (ANN) methods. The direct and inverse problems are described, formulated and solved. After the use of an experiment design technique, the hybrid combination ANN-LM-SA yielded good estimates for the heat and mass transfer problem of interest. The proper choice of the set of parameters to be estimated allowed the design of an experiment with higher sensitivity coefficients. One ANN was used to generate the initial guess for the LM, another one to approximate the gradient needed by LM, and, finally, the global minimum was searched using the SA. The experimental data considered in the inverse problem was generated using the solution for the direct problem with the addition of noise.

Use of the MOHID Platform for computational simulation of oil ocean drift in the Campos basin - RJ

This work presents a model for ocean drift simulations data obtained with the MOHID software in the Campos Basin (RJ, Brazil) to study oil environmental issues. Results were compared with satellite data, as well as temperature and salinity data obtained by ARGO drifters available in the region.

Application of Artificial Neural Networks and Hybrid Methods in the Solution of Inverse Problems

In this chapter Artificial Neural Networks are presented and used to solve different parameter estimation inverse problems, that is, Gas-liquid Adsorption Mass Transfer, Radiative Transfer Problems, and Simultaneous Heat and Mass Transfer. Besides, results obtained using hybrid methods are also presented, combining the Artificial Neural Network (ANN) method to other inverse problem solutions techniques, such as Simulated Annealing (SA) and Levenberg-Marquardt (LM). The first problem studied is the radiative transfer phenomenon, modeled with an integrodifferential equation known as Boltzmann equation. This equation describes mathematically the interaction of the radiation with the participating medium, i.e., a medium that may absorb, scatter and emit radiation. The inverse radiative transfer problem considered the simultaneous estimation of the absorption and scattering coefficients of a two-layer medium, using measured exit radiation intensities. In this sense, a study is presented regarding the estimation of radiative properties using ANN and hybrid methods combining ANN and LM. Then, the inverse problem of simultaneous heat and mass transfer modeled by Luikov equations is studied using a hybrid combination of the ANN, LM and SA. Direct and inverse problems are presented, formulated and solved. An ANN was used to generate the initial guess for the LM, another ANN to approximate the gradient needed by LM, and finally the global minimum was searched using the SA. The experimental data used was generated using the solution for the direct problem with the addition of artificial noise. The gas-liquid interface adsorption isotherm identification is also investigated using the same hybrid approach, that is, the combination of an ANN, LM and SA methods. The bubble and foam fractionation columns system works basically through the injection of a gas at the base of a column containing the solution. The gas bubbles formed in the

ESTIMATIVA DO DIÂMETRO DAS GOTÍCULAS RESULTANTES DO BLOWOUT DE UM POÇO DE PETRÓLEO – ESTUDO DE SENSIBILIDADE

The blowout of an oil well launches hydrocarbons into the marine environment in the form of oil droplets and gas bubbles. As can be seen in the Deepwater Horizon leakage in the Gulf of Mexico in 2010, parameters such as depth

DISPOSAL OF WASTE FROM CEMENTING OPERATION FROM OFFSHORE OIL AND GAS WELLS BUILDING

This paper presents computer modeling applied to the disposal simulation residual volume from offshore cementing unit, where the cement paste used by cementing operations of oil and gas wells. The software used was MOHID WATER with a lagrangian approach where the solid part of the residue was represented by conservative particles. It is able to assess the behavior of the solid part of the residue in the water column and its accommodation on the seabed. Future works using the Life Cycle Impact Assessment (LCIA) standard methods are considered to understand the results and the possible resulting harm to marine organisms.

ASSESSMENT OF THE IMPACT OF A SMALL HYDROELECTRIC POWER PLANT OVER THE WATER QUALITY OF THE ITABAPOANA RIVER THROUGH A COMPUTATIONAL MODEL

This work presents the results of hydrodynamic and transport, which were applied to a stretch of Itabapoana River, located in the northwest of Rio de Janeiro State, in order to assess the environmental consequences of the implantation of a Small Hydroelectric Plant. The models were calibrated by comparing simulated and observed data, for a giving condition, regarding both hydrodynamic and water quality variables. Once calibrated, the models simulated different scenarios, with a special emphasis to those generated under low flow regime, which are environmentally more critics. The results showed that, for these conditions, some water quality parameters, markedly the Dissolved Oxygen concentration, would be affected by the change in flow regime, caused by the withdrawal of water to power the turbines of the hydroelectric plant.

Mathematical modeling of low course of São João river study of saline intrusion

This paper shows the results of numerical simulation during 24 hours in a situation of “sizígia” tide of the proposed model for the lower course of the river São João, located between the towns of Casemiro de Abreu ( Barra de São João location) and Cabo Frio (Tamoios location). This model aims to determine the extent of the intrusion of salt.

Computational modeling as a tool for water resources management: an alternative approach to problems of multiple uses

Today in Brazil there are many cases of incompatibility regarding use of water and its availability. Due to the increase in required variety and volume, the concept of multiple uses was created, as stated by Pinheiro et al. (2007). The use of the same resource * Instituto Federal Fluminense/Câmpus Macae – Graduanda em Engenharia de Controle e Automacao e Bolsista de Iniciacao Cientifica CNPq/PIBIC. ** Instituto Federal Fluminense/Câmpus Macae – Mestrando do Programa de Mestrado Profissional em Engenharia Ambiental e PETROBRAS Bacia de Campos, Macae/RJ, Brasil. *** Instituto Federal Fluminense/Câmpus Macae – Mestrando do Programa de Mestrado Profissional em Engenharia Ambiental e PETROBRAS Bacia de Campos, Macae/RJ, Brasil. **** Instituto Federal Fluminense/Câmpus Macae – Professor/Pesquisador do Programa de Mestrado Profissional em Engenharia Ambiental e especialista do CENTRO DE TECNOLOGIA SENAI RJ Ambiental – CTS-A, Rio de Janeiro/RJ, Brasil. E-mail: jljunior@iff.edu.br. ***** Instituto Federal Fluminense. Câmpus Macae/NUPERN – Professora/Pesquisadora do Programa de Pos-graduacao em Engenharia Ambiental do Instituto Federal Fluminense. Boletim do Observatorio Ambiental Alberto Ribeiro Lamego, Campos dos Goytacazes/RJ, v. 5 n. 1, p. 71-87, jan. / jun. 2011 72 Haydda Manolla Chaves da Hora et al. Boletim do Observatorio Ambiental Alberto Ribeiro Lamego, Campos dos Goytacazes/RJ, v. 5 n. 1, p. 71-87, jan. / jun. 2011 to satisfy different needs with several restrictions (qualitative and quantitative) creates conflicts. Aiming to minimize these conflicts, this work was applied to the particular cases of Hydrographic Regions VI and VIII of Rio de Janeiro State, using computational modeling techniques (based on MOHID software – Water Modeling System) as a tool for water resources management.