Mediterranean Journal of Modeling and Simulation

10

Authors: Nabiha Brik, Mourad Chamekh

In this work we consider a nonlinear elliptic partial differential equation, which is derived from an application of a nonlinear Schrödinger equation. Using a variational approach on this problem leads to an optimization problem with a nonlinear constraint. A numerical solution based on finite-element method is used. We propose a new iterative algorithm to relax this problem to a quadratic version.

11

Authors: Bilal Abderezzak

The new world energy policies encourage the use of renewable energy sources with clean technologies, and abandon progressively the fossil fuel dependence. Another energy generation trend called commonly the “Waste-to-Energy” solution, uses organic waste as a response for two major problems: energy generation and waste management. Thanks to the anaerobic digestion, the organic waste can provide a biogas composed essentially from Carbone dioxide (CO2) and Methane (CH4). This work aims essentially to help students, researchers and even decision makers to consider the importance of biogas generation. The proposed tool is the last version of our previous tool which is enhanced and completed. It presents the potential to produce biogas of any shortlisted kind of waste, including also some energy valorization ways. A technical economical data are introduced for eventual feasibility studies.