Arezki Smaïli

Arezki Smaïli
National Polytechnic School of Algiers | ENP · Department of Mechanical Engineering

PhD

About

120
Publications
26,132
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687
Citations

Publications

Publications (120)
Article
Full-text available
This paper presents a numerical method based on Navier-Stokes equations and generalized actuator disc concept to investigate the aerodynamics of horizontal axis wind turbines (HAWT). The rotor modelling is first described, then the formulation to solve the governing equations is outlined. Simulation results on the flow around a typical commercial w...
Article
Full-text available
This article presents a numerical method for predicting unsteady aerodynamics of horizontal axis wind turbines (HAWTs). In this method the flow field is described by the unsteady incompressible Navier–Stokes equations. The rotor and tower are idealized respectively as actuator disc and flat plate permeable surfaces on which external normal surficia...
Article
Full-text available
This article presents a numerical method for the simulation of turbulent flow around the nacelle of a horizontal axis wind turbine. The flow field around the turbine and nacelle is described by the Reynolds-averaged Navier–Stokes equations. The k–ϵ model has been chosen for closure of the time-averaged turbulent flow equations. The rotor disc is mo...
Article
In this paper, an original second-order upwind scheme for convection terms is described and implemented in the context of a Control-Volume Finite-Element Method (CVFEM).The proposed scheme is a second-order extension of the first-order MAss-Weighted upwind (MAW) scheme proposed by Saabas and Baliga (Numer. Heat Transfer 1994; 26B:381–407). The prop...
Book
Full-text available
Ce cours vise à fournir une formation complète et concise sur Matlab et Simulink, qu’ils sont deux outils numériques très puissants utilisés mondialement pour la modélisation de systèmes physiques, la simulation de modèles mathématiques, la représentation et la validation d’applications d'ingénierie multi-domaines (mécanique, électrique, chimie, én...
Article
A comparative study between two techniques of solar integration in Integrated Solar Combined Cycle system power plant in terms of thermal performances and economic assessment is carried out in this work. The first system power plant is based on parabolic trough collector technology where solar heat is introduced in the steam power block as latent h...
Article
Full-text available
The Actuator Disk Method (ADM), in its analytical formulation or combined with Navier-Stokes equations, is widely used for design and/or for aerodynamic analysis of Horizontal Axis Wind Turbines (HAWT). This method has demonstrated its capabilities for performance predictions of HAWT rotors for limited range of wind speeds with lower angles of a...
Article
The present work aims at performing a comparative study between precooled Claude cycle and an Active Magnetic Regeneration Cycle (AMR cycle) applied to hydrogen liquefaction. It deals with a comparison between performances and energy consumption evaluated for the two systems at similar operating conditions. For Claude system, energy and material ba...
Article
The wake flow characteristics downstream from the rotor blade of small HAWT have been investigated using Particle Image Velocimetry and an Actuator Disk Method developed in OpenFOAM at low Reynolds number of Re ≈ 47 000 for four TSR values of 6, 5.5, 5 and 4.5. The wind tunnel measured mean velocity distributions along the rotor radius, for two TSR...
Chapter
Turbulence is a phenomenon associated with the flow of wind in wind farms. It has a significant effect on the performance of wind turbines, causes a strong load on the blades and modifies the evolution of the profile of the wind speed in the increasing wake. In order to investigate this phenomenon and describe in a much more precise way the effect...
Article
Full-text available
Wind speed forecasts are needed for a variety of applications, like satellite launching, aviation, planning of construction, prediction of output power from wind turbines, etc. In this study, an artificial intelligence approach, namely Artificial Neural Networks (ANNs) has been applied to predict the distribution of daily wind speed at height of th...
Article
In this paper, a solar water heating system (SWHS) based on 4 m² flat plate collectors is integrated to an office building to ensure the heat demand. The SWHS is equipped with Labview software and a multichannel digital card that makes the system control and data acquisition automatic. A TRNSYS model is developed and validated against experimental...
Conference Paper
In order to perform an aerodynamic performances study around Horizontal Axis Wind Turbine (HAWT) rotor, an in-house axisymmetric RANS code based on the actuator disc concept coupled to the Blade Element (BE) theory has been developed using OpenFOAM. The rotor blades have been modeled with a permeable surface defined by the rotor swept area where th...
Book
This book presents selected articles from the Algerian Symposium on Renewable Energy and Materials (ASREM-2020) held at Médéa, Algeria. It highlights the latest advances in the field of green energies and material technology with specific accentuation on numerical plans and recent methodologies designed to solve engineering problems. It includes ma...
Conference Paper
Full-text available
This paper proposes numerical method for aerodynamic performance predictions of Horizontal Axis Wind Turbines (HAWT) immersed on Atmospheric Boundary Layer (ABL) flows under unstable, stable and neutral conditions. The flow field has been described using the three-dimensional RANS equations complemented by the k-ε turbulence model with modified con...
Article
Full-text available
The aim of this study is the thermo-economic assessments of an integrated solar combined cycle (ISCC) system, in terms of thermal efficiency, electricity production and levelized electricity cost (LCOE). During the day light the power plant operates as an ISCC and operates as a conventional combined cycle (CC) during the night or cloudy days. In on...
Article
Full-text available
This paper is focusing on a numerical investigation of hydrogen Active Magnetic Regenerative Liquefier (AMRL). For this purpose, two-dimensional transient numerical modeling with finite volume method has been developed (i.e. CFD method) to simulate the parallel plane plate (PPP) AMRL regenerators type in order to predict and investigate its thermal...
Chapter
The Solar power plants with parabolic trough collectors (PTCs) represent more than 92% of the solar thermal power plants currently in operation. It is also the most suitable technology for most plants under construction and planned [1]. The present study evaluates the thermal performance of LS-2 parabolic trough collector of Solar Electric Generati...
Conference Paper
Full-text available
In this study, the performance characteristics of small-scale propeller (APC 10x5E) for a drone in axial flight have been analysed using the Blade element theory and actuator disc concept. This is known as hybrid method. In the first part, the aerodynamic forces on the peopeller have been estimated using the blade element approch. In the second par...
Article
Thermal potential for cooling and heating can be achieved by new configuration of earth–air heat exchanger (EAHE). This paper presents a numerical investigation of thermal performance of a spiral-shaped configuration of EAHE intended for the summer cooling in hot and arid regions of Algeria. A commercial finite volume software (ANSYS FLUENT) has be...
Article
The Algerian Sahara is characterized by severe climate conditions where temperature reaches high levels with large variations during day and season. Nacelles of wind turbines operating in this region are subjected to the over heating problem, in particular the electromechanical components becoming less effective as they heat up during use. In orde...
Article
Experimental measurements of velocity field have been performed in the near wake of a scaled wind turbine with 0.350 m of rotor diameter by using Particle Image Velocimetry in a wind tunnel. Measurements have been carried out for two tip speed ratios 6.76 and 9.91. Numerical simulation of the flow field around the same wind turbine is also studied....
Conference Paper
This paper proposes a new stall delay model for a better prediction of aerodynamic performances for small Horizontal Axis Wind Turbine (HAWT) Blade. The proposed model corrects the 2D lift coefficient of the wind turbine blade section to take into account the 3D blade rotation i.e., stall delay effect. It has been carried out based on analysis done...
Article
An improved solar parabolic trough collector model has been developed in this study, to overcome the weakness of the previous published studies in predicting accurate performance, at higher operating temperatures. To check the accuracy of the proposed model, both on‐sun and off‐sun tests have been considered. The on‐sun tests are aimed to check the...
Article
PROMES-CNRS laboratory has recently inaugurated a small scale parabolic trough power plant, named “MicroSol-R”, for research activities. The platform is aimed to test and improve various technologies including thermal energy storage, power conversion cycle, heat transfer fluid and collectors. This article highlights the experimental and numerical i...
Conference Paper
The main objective of this work is to study numerically the sand effect on the aerodynamic performance of horizontal axis wind turbines (HAWTs) installed in Sahara regions. The study was applied for the arid zone of Adrar located in the south of Algeria. A numerical method based on a Eulerian-Lagrangian approach has been developed to evaluate the i...
Article
Full-text available
The effects of different Reynolds Averaged Navier Stokes (RANS) turbulence models on two near-wall approaches using high and low Reynolds models on predicting performance of horizontal axis wind turbines (HAWTs) were studied for a range of wind conditions where flow over the rotor varied from fully attached to massively separated flow. This paper's...
Article
Full-text available
In this paper, the effect of mesh topology on the numerical predictions of the immediate near wake region of a horizontal axis wind turbine is investigated. The present work focuses on the nacelle anemometry measurements. Steady Reynolds Averaged Navier-Stokes (RANS) equations are applied to describe the airflow around the wind turbine nacelle. The...
Article
Full-text available
The effects of different Reynolds Averaged Navier Stokes (RANS) turbulence models on two near-wall approaches using high and low Reynolds models on predicting performance of horizontal axis wind turbines (HAWTs) were studied for a range of wind conditions where flow over the rotor varied from fully attached to massively separated flow. This paper's...
Conference Paper
Full-text available
The essential contribution of this study consists of comparing between two radically different aerodynamic methods which were applied to predict the aerodynamic performance of horizontal axis wind turbines (HAWTs). The classical blade element momentum theory (BEM) and full rotor geometry computational fluid dynamics (CFD) based on the Reynolds Aver...
Conference Paper
Concentrating solar power (CSP) technologies are one of the most promising renewable energy sources for clean electricity generation. The parabolic trough is the proven technology for power generation of all the CSP technologies available up to now. The optical performance of typical Parabolic Trough Collector (PTC) is strongly related to the heat...
Article
The present paper deals with thermal analysis of cascade Active Magnetic Regenerator (AMR) cycle for the liquefaction of hydrogen starting from room temperature. For this purpose, the energy equations for fluid and solid within the regenerator bed of the AMR cycle have been considered. To solve the resulting mathematical model implicit finite diffe...
Article
Full-text available
The Algerian Sahara is characterized by severe climate conditions where temperature reaches high levels with large variations during day and season. Nacelles of horizontal axis wind turbines (HAWT) operating in this region are subjected to the overheating problem, in particular the electromechanical components becoming less effective as they heat u...
Article
Full-text available
Concentrating solar power (CSP) represents a powerful, clean, endless, and reliable source of energy. Which, the parabolic trough collector (PTC) system was the first CSP technology to date, thus it is the most developed and most commonly replicated system. The optical analysis of a solar concentrator represents a major interest to evaluate the per...
Article
Full-text available
The climate of the Algerian Sahara is characterized by extreme thermal conditions. The wind turbines installed in the Sahara, namely the electromechanical equipment located inside the nacelle (e.g. electrical generator), are subjected to high and fluctuating temperature gradients during the day and the seasons. This reality might generate contradic...
Conference Paper
Full-text available
The increasing in energy demand, the decreasing of energy sources and the pollution of the environment imply developing alternative sources of energy cleaner than fossil and conventional energy sources'. Therefore, renewable energy presents the best solution. Thermal applications are one of numerous renewable energy applications. This work investig...
Conference Paper
Full-text available
The essential part of a wind turbine is the geometry of the blade. This geometry based on both well thought-out and optimized aerodynamic airfoils is unfortunately subject to external effects that can cause it to deform. Indeed, the geometry of the blade, as well as its surface state, degrades during the life cycle of the wind turbine. Accumulation...
Conference Paper
The main objective of this work is to assess the effectiveness of turbulence models in the numerical prediction of the flow field around the horizontal axis wind turbines (HAWT). The investigation tests different turbulence models representing low-and high-Reynolds-models, based on the Reynolds Averaged Navier Stokes equations (RANS) approach. The...
Article
Full-text available
In this work, an analytical study on the active magnetic regeneration cycle operating near room tempera-ture using nanofluid as carrier fluid, in order to enhance the heat transfer in regenerator bed after magnetization and demagnetization process. For this purpose, a nanofluid based on Al2O3 has been proposed. A numerical simulation of 1D model ba...
Conference Paper
Full-text available
The present paper deals with performance predictions of a multistage AMR cycle applied for the liquefaction of hydrogen starting from room temperature. The main object of this work is to determine the number of cycles, to calculate the volume of magnetic material required and to evaluate the efficiency of the system. For this purpose, the energy eq...
Conference Paper
This work deals with the development of numerical simulation method of an active magnetic regenerator (AMR) cycle by using advanced programming tools of ANSYS-Fluent code. For this purpose, the following tools: scheme commands, RP-variables (RP refers to user-specifiable model macros in Fluent), and user defined functions (UDFs) have been considere...
Conference Paper
Full-text available
A numerical study was conducted for prediction of ground temperature profile for different depths. 3D transient modelling based on energy conservation formulation has been applied on a 25.77 m x 5 m x 15 m ground volume calculation domain. ANSYS FLUENT code have been used for this work. Two arid regions located in the south of Algeria have been cho...
Conference Paper
Full-text available
Ce travail présente une étude numérique de refroidissement par convection naturelle d'une source de chaleur intégrée sur la paroi inférieure d'une enceinte remplie d'un nanofluide eau-cuivre. Les parois supérieures et verticales de l'enceinte sont maintenues à une température relativement basse. Les équations de transport pour un fluide newtonien s...
Conference Paper
Full-text available
This paper aims to simulate the flow around horizontal axis wind turbine blade using a validated CFD3D Navier–Stokes flow solver. The main objective of this study is investigating of different turbulence models and aerodynamic performance of wind turbine blades. Four different RANS turbulence models have been considered, namely, Spalart-Allmaras, k...
Conference Paper
Full-text available
This paper investigates performance assessment of the active magnetic refrigeration cycle (AMR) applied to hydrogen liquefaction. Particular attention is given to a comparison between closed and open cycles. The former is based on the use of a heat-transfer fluid circulating in a closed circuit between the magnetic material and the gas to be liquef...
Conference Paper
Full-text available
Wind turbines that would be installed in hot climate (e.g. Algerian Saharan region) should operate under severe weather conditions and fluctuating temperature during the day and seasons. Particularly, the electric/electronic equipments located within the nacelle may be subjected to extremely high temperature variations, thus leading to inconsistent...
Conference Paper
Full-text available
A number of solar thermal power plants have been planned by the Algerian state for the horizon of 2030, for the purpose to achieve the self-sufficiency from solar electricity and its exportation. The main objective of the present paper is annual performance and economic assessment of an Integrated Solar Combined Cycle System (ISCCS-18) of 68.2 MWe...
Article
Le présent travail porte sur l’étude de faisabilité d’appliquer la technique de réfrigération magnétique (RM) à la liquéfaction du gaz naturel (c’est-à-dire, liquéfacteur magnétique). Il s’agit de modéliser le phénomène de la réfrigération magnétique, de proposer un prototype de liquéfacteur magnétique et d’évaluer les performances du système. Un t...
Conference Paper
The aim of this paper is to propose a composite material based on compounds of LaFeCoSi operated in temperature range 275-315K. The composite material was designed according to the optimum composite fractions, which were determined numerically. A force of approximately 100 kN was applied to the assemblies of the composite elements to obtain a homog...
Presentation
Full-text available
Nowadays, the horizontal axis wind turbine (HAWT) type is usually the most common design of modern wind turbine, which is the focus of this study. Aerodynamic analysis is one of the most critical steps in designing HAWT rotors. Mainly, three formulations have been used to perform such analysis and are classified as follows: (i) Integral formulation...
Conference Paper
Full-text available
This work presents an experimental investigation on a reciprocating active magnetic regenerator (AMR) refrigerator-demonstrator operating near room temperature. La(Fe, Co)13−x Six is used as a refrigerant material in the form of multilayer and water as heat transfer fluid to release and absorb heat at the hot and cold sources, respectively. Experim...
Article
This paper presents a numerical method for investigating aerodynamics of a horizontal axis wind turbine (HAWT). The flowfield around an isolated turbine is described by the Reynolds-averaged Navier-Stokes equations. The turbine is idealized as an actuator disk surface, on which external surficial forces exerted by the turbine blade on the flow are...
Article
Full-text available
Une étude basée sur la résolution des équations moyennées de Navier-Stockes (RANS) écrites pour un écoulement bidimensionnel axisymétrique en régime stationnaire a été effectuée à l'aide du code saturne d'EDF pour caractériser l'écoulement autour d'une nacelle d'éolienne à axe horizontal de type NORDEX N80. Le modèle de turbulence k- a été considé...
Article
In this paper, numerical and experimental investigations on a magnetic refrigeration device based upon the active magnetic regeneration (AMR) cycle operating near room temperature are presented. A numerical 1D model based on the transient energy equations is proposed for modelling the heat exchange between the magnetocaloric material and the carrie...