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Analyse fréquentielle et modélisation statistique des crues cas du bassin versant « Isser Sekkak »
(2026) Belhadef Chahrazed; Bouazza Chaimaa; Bentahar Kheira
Floods are one of the most significant hydrological phenomena due to their impacts on
populations, infrastructure, and the environment. The knowledge of extreme flows is essential
for the design of hydraulic structures and the management of flood risk. In this context, this
work focuses on the frequency analysis and statistical modeling of floods in the Isser Sikkak
watershed based on the available hydrometric data.
The study consisted of analyzing a series of daily maximum rainfall to evaluate its statistical
characteristics and quality. Several probability distributions were fitted to the observed data,
including the Gumbel distribution and the log-normal distribution. The quality of the fit was
evaluated using the AIC and BIC criteria as well as the Chi-squared and Kolmogorov-Smirnov
statistical tests, using the Hyfran Plus and Hydrognomon software.
The results obtained allowed for the identification of the most appropriate probability law to
represent the behavior of the rainfall in the studied basin. Subsequently, the analysis of short-
duration precipitation allowed for the construction of the IDF curves.
The interpretation of the results shows that the Sokolovsky method is the most appropriate for
estimating the maximum flows of the Oued Isser sikkak basin corresponding to different return
periods, such as 10, 20, 50, and 100 years. These estimates provide essential information for
the design of hydraulic structures and the assessment of flood risk.
Finally, this study highlights the value of frequency analysis as a decision-making tool in the
field of hydrology. The results obtained could be utilized in future work on hydraulic modeling
and flood zone mapping.
Modélisation en 3D et analyse des écoulements internes dans le compresseur axial Nasa Stage 37 Via ANSYS CFX
(2026) AGUILI MOHAMED; GUETTACHE MOUADE HOUSSEM; HARCHOUCHE Zine el abidine
This study focuses on the modeling, simulation, and analysis of the aerodynamic behavior
of a NASA Stage 37 transonic axial compressor using computational fluid dynamics (CFD) with
the ANSYS Fluent software. This compressor is a widely used reference case in the field of
turbomachinery for studying compressible flows and high-speed transonic phenomena. A three-
dimensional numerical model was developed to solve the conservation equations for mass,
momentum, and energy. The simulation incorporates appropriate physical models, including
turbulence models, rotational effects, and rotor-stator interactions. Boundary conditions were
defined to reproduce the actual operating conditions of the compressor. The main objective of this
study is to evaluate the aerodynamic performance of the NASA Stage 37 through the analysis of
key parameters such as the compression ratio, isentropic efficiency, pressure distribution, velocity
fields, and internal aerodynamic losses. The results obtained also allow the study of complex
phenomena present in transonic compressors, such as shock waves, flow separations, and
recirculation zones. Finally, this numerical approach offers a better understanding of the
compressor's hydrodynamic behavior and provides an important basis for optimizing performance
and improving the design of modern turbomachinery.
Etude expérimentale et optimisation des performances du procédé d’osmose Inverse pour le dessalement d’eau de mer
(2026) Chelhaoui abdelmoudjib.; Azza mohamed; NEHARI ABDERRAHMANE
The growing demand for freshwater, combined with climate change and the depletion of
conventional water resources, has made seawater desalination an essential solution for ensuring
water security. Among the available desalination technologies, reverse osmosis (RO) has
emerged as the most efficient and widely adopted process due to its high salt rejection, relatively
low energy consumption, and economic feasibility.
The présent study focuses on the experimental evaluation of a reverse osmosis desalination
system using a laboratory-scale pilot unit. A comprehensive bibliographic review was first
conducted to present the principles of seawater desalination, the different desalination
technologies, membrane characteristics, operating parameters, membrane fouling mechanisms,
recent technological developments, and the status of desalination in Algeria, with particular
emphasis on the Béni Saf desalination plant.
The expérimental investigation aimed to asses the influence of transmembrane pressure and
operating time on the performance of the reverse osmosis process. The system performance was
evaluated through permeate production and membrane behavior under different operating
conditions. The obtained results showed that increasing the operating pressure improves
permeate flux and desalination efficiency, while prolonged operation may reduce membrane
performance because of fouling and concentration polarization.
This work highlights the importance of optimizing operating conditions to improve the
efficiency, productivity, and sustainability of reverse osmosis desalination systems. The
findings contribute to a better understanding of membrane-based desalination processes and
provide useful guidance for improving the performance of seawater desalination technologies.
Étude expérimentale et numérique de la réparation des polymères fissurés par friction malaxage
(2026) SI ABDELKADER Abdelkader; BENCHOHRA Fatima Zahra; SERIER Mohamed
This work falls within the scope of repairing polymer structures damaged by cracking,
proposing Friction Stir Welding (FSW) as an innovative alternative to conventional fusion welding
processes. Following a literature review dedicated to the properties of High-Density Polyethylene
(HDPE), the cracking mechanisms of semi-crystalline polymers, and the limitations of classic
welding techniques, the study utilizes the Response Surface Methodology (RSM) / Design of
Experiments (DoE) to quantify the influence of the FSW operating parameters—rotational speed,
traverse speed, and tool tilt angle—on the maximum temperature developed within the weld zone.
A full factorial design was employed to establish a predictive regression model, complemented by
an artificial intelligence approach based on an Artificial Neural Network (ANN) to refine the
thermal response modeling. The obtained results confirm that the process takes place entirely in a
steady visco-plastic state, below the crystalline melting point of HDPE, and highlight the
predominant role of the rotational speed and its interaction with the tilt angle. The identified
operating conditions open promising perspectives for the industrial application of FSW in repairing
thermoplastic polymer components, while emphasizing the need for additional testing to
consolidate the statistical robustness of the proposed model.
Développement d’un Serveur SIP pour les Réseaux Multimédia
(2026) MAREF Younes; MEKAMI Hayat
As part of our final-year project, we developed a Voice over IP (VoIP) telephony solution
based on the Asterisk server running on Debian 12.
First, we studied the fundamental concepts of VoIP and the main protocols used in IP
voice communications, including SIP, H.323, RTP, and RTCP. This theoretical study enabled
us to gain a better understanding of IP telephony networks and the signaling and media transport
mechanisms involved in voice communications.
For the practical implementation, VMware Workstation was used to create a virtual
machine running Debian 12. Within this environment, the Asterisk server was installed and
configured, and several SIP accounts were created to establish voice communications between
users through the MicroSIP softphone.
In addition, security mechanisms were implemented to enhance the reliability of the
solution, and an interconnection between the VoIP network and the Public Switched Telephone
Network (PSTN) was established. Finally, a series of tests was conducted to verify the proper
operation of the system and validate the different configurations performed.
The results demonstrate that an Asterisk-based VoIP solution represents a reliable,
flexible, and cost-effective alternative to traditional telephony systems while providing
significant opportunities for scalability and integration.