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Titre : Approches numériques par des volumes finis d’une équation de transport Type de document : texte imprimé Auteurs : Lakhdar Kassah Laouar, Auteur ; Fateh El Lagoune, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2012 Importance : 89 f. Format : 31 cm. Note générale : Magister
2 copies imprimées disponiblesLangues : Français (fre) Catégories : Français - Anglais
MathématiquesTags : Modélisation mathématique equation de transport lois de conservation Différences finies volumes finis approches algorithmiques estimations d’erreur vitesse de convergence simulations numériques Index. décimale : 510 Mathématiques Diplôme : Magistère En ligne : ../theses/math/KAS6213.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6166 Approches numériques par des volumes finis d’une équation de transport [texte imprimé] / Lakhdar Kassah Laouar, Auteur ; Fateh El Lagoune, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2012 . - 89 f. ; 31 cm.
Magister
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
MathématiquesTags : Modélisation mathématique equation de transport lois de conservation Différences finies volumes finis approches algorithmiques estimations d’erreur vitesse de convergence simulations numériques Index. décimale : 510 Mathématiques Diplôme : Magistère En ligne : ../theses/math/KAS6213.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6166 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité KAS/6213 KAS/6213 Thèse Bibliothèque principale Thèses Disponible Étude de l’amortissement de la réponse aérodynamique d’une aile d’avion poreuse soumise à une turbulence atmosphérique intense et brusque. / Bachir Dahdi
Titre : Étude de l’amortissement de la réponse aérodynamique d’une aile d’avion poreuse soumise à une turbulence atmosphérique intense et brusque. Type de document : texte imprimé Auteurs : Bachir Dahdi, Auteur ; Smail Benissaad, Directeur de thèse ; Mahmoud Mamou, Directeur de thèse Mention d'édition : 26/10/2019 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 90 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : G.Mécanique: Energétique simulations numériques perturbations atmosphériques profil WTEA-TE1 porosité Numerical simulations turbulence disturbance WTEA-TE1aerofoil porosity المحاكاة العددية الاضطراب الجوي الجناح ذو المسامات Index. décimale : 620 Génie Mécanique Résumé :
Numerical simulations were performed to analyze the possibility of damping abrupt incoming free stream disturbances upon a porous airfoil using an unsteady Reynolds-averaged Navier-Stokes(URANS) model. To mimic the turbulence disturbance levels that are typically encountered in the atmosphere, two flow configurations were considered. In the first configuration, the unsteadiness of the flow was created with vortices shed from a circular cylinder installed ahead of a WTEA-TE1aerofoil. The continuous Von Karman shedding vortices contained within the cylinder wake were convected downstream and projected upon the airfoil. In the second configuration, an instantaneous pair of discrete vortices was created by a rotational snapping of a flat plate, installed upstream of the airfoil. Solid and porous airfoil configurations, with porosity settings of 11 and 22%, were applied on 50% of the chord of the airfoil starting from the leading edge. Both steady and unsteady flow simulations were performed to assess the performance of the porosity under steady and unsteady effects. The steady state flow simulations revealed a noticeable reduction in the airfoil lift coefficient for the porous airfoil. For unsteady solutions with a continuous or distinct series of vortices interacting with the airfoil, the porosity showed insignificant damping of the lift coefficient amplitude. The porosity values investigated in the current exercise had indiscernible effect upon the unsteady lift-load alleviations caused by free stream disturbances.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/DAH7841.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11679 Étude de l’amortissement de la réponse aérodynamique d’une aile d’avion poreuse soumise à une turbulence atmosphérique intense et brusque. [texte imprimé] / Bachir Dahdi, Auteur ; Smail Benissaad, Directeur de thèse ; Mahmoud Mamou, Directeur de thèse . - 26/10/2019 . - جامعة الإخوة منتوري قسنطينة, 2019 . - 90 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : G.Mécanique: Energétique simulations numériques perturbations atmosphériques profil WTEA-TE1 porosité Numerical simulations turbulence disturbance WTEA-TE1aerofoil porosity المحاكاة العددية الاضطراب الجوي الجناح ذو المسامات Index. décimale : 620 Génie Mécanique Résumé :
Numerical simulations were performed to analyze the possibility of damping abrupt incoming free stream disturbances upon a porous airfoil using an unsteady Reynolds-averaged Navier-Stokes(URANS) model. To mimic the turbulence disturbance levels that are typically encountered in the atmosphere, two flow configurations were considered. In the first configuration, the unsteadiness of the flow was created with vortices shed from a circular cylinder installed ahead of a WTEA-TE1aerofoil. The continuous Von Karman shedding vortices contained within the cylinder wake were convected downstream and projected upon the airfoil. In the second configuration, an instantaneous pair of discrete vortices was created by a rotational snapping of a flat plate, installed upstream of the airfoil. Solid and porous airfoil configurations, with porosity settings of 11 and 22%, were applied on 50% of the chord of the airfoil starting from the leading edge. Both steady and unsteady flow simulations were performed to assess the performance of the porosity under steady and unsteady effects. The steady state flow simulations revealed a noticeable reduction in the airfoil lift coefficient for the porous airfoil. For unsteady solutions with a continuous or distinct series of vortices interacting with the airfoil, the porosity showed insignificant damping of the lift coefficient amplitude. The porosity values investigated in the current exercise had indiscernible effect upon the unsteady lift-load alleviations caused by free stream disturbances.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/DAH7841.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11679 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité DAH/7841 DAH/7841 Thèse Bibliothèque principale Thèses Disponible
Titre : New redshift and its implications. Type de document : texte imprimé Auteurs : Mohamed Lamine Abdelali, Auteur ; Noureddine Mebarki, Directeur de thèse Mention d'édition : 22 / 0 1 / 2020 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2020 Importance : 194 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Anglais (eng) Catégories : Français - Anglais
PhysiqueTags : physique: Particules élémentaires et Cosmologie Champs magnétiques ondes gravitationnelles redshift simulations numériques paramètres cosmologiques Le quintette de Stephan rayons cosmiques ultra haute énergie Magnetic fields gravitational waves numerical simulations cosmological parameters Stephan’s Quintet ultra high energy cosmic rays المجالات المغناطیسیة موجات الجاذبیة الانزیاح نحو الأحمر محاكاة عددیة المعاملات الكونیة خماسیة
ستیفان الأشعة الكونیة عالیة الطاقةIndex. décimale : 530 Physique Résumé :
Modern cosmology has several unexplained astrophysical observations which are still paradoxical. Among those mysteries, we find discrepancy in cosmological parameters estimations, accelerated expansion of the Universe, cosmic magnetic fields origins and several small scale anomalies like compact clusters or galaxy-quasar associations and ultra high energy cosmic rays. Efforts made in the field of observational cosmology didn’t solve those questions. Moreover, several theories has been proposed as extensions or complete replacement of standard theories such as Einstein’s general relativity or standard model of particle physics to explain paradoxical observations. But, they failed to account for all classical tests and didn’t provide a consistent explanation of all observations. In this research, we adopt a different approach in which our interpretation of observations is re-examined in light of new and previously unconsidered effects contributing to cosmological data especially observed redshift. A new effect is predicted to be the result of the gravitational interaction between photons and constant magnetic fields creating gravitational waves. The energy carried by these waves is manifested as a photon redshift contributing to those observed redshifts. Contributions from this effect are misinterpreted as caused from Doppler Effect or gravitational redshift. Analytical methods and especially numerical methods are used in this thesis to estimate this new effect impacts. With analytical methods, new solutions are found for Maxwell’s equations proving a preservation of smooth primordial magnetic fields after recombination. With numerical methods, several codes such as SCOPE, RPC and extended version of CRPROPA are developed and is used to present possible explanations to a number misunderstood phenomena. Extensions to both codes ENZO and YT are used to study our redshift effect impacts
using cosmological simulations. The analysis of synthetic observations has shown a significant contribution of our redshift affecting revised models of Stephan’s Quintet members and cosmological parameters estimations especially Hubble constant. A large number of results has been achieved using our code and still need further confirmations after more development and extensions in future research
Note de contenu : Appends.
Diplôme : Doctorat En ligne : ../theses/physique/ABD7615.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11451 New redshift and its implications. [texte imprimé] / Mohamed Lamine Abdelali, Auteur ; Noureddine Mebarki, Directeur de thèse . - 22 / 0 1 / 2020 . - جامعة الإخوة منتوري قسنطينة, 2020 . - 194 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Anglais (eng)
Catégories : Français - Anglais
PhysiqueTags : physique: Particules élémentaires et Cosmologie Champs magnétiques ondes gravitationnelles redshift simulations numériques paramètres cosmologiques Le quintette de Stephan rayons cosmiques ultra haute énergie Magnetic fields gravitational waves numerical simulations cosmological parameters Stephan’s Quintet ultra high energy cosmic rays المجالات المغناطیسیة موجات الجاذبیة الانزیاح نحو الأحمر محاكاة عددیة المعاملات الكونیة خماسیة
ستیفان الأشعة الكونیة عالیة الطاقةIndex. décimale : 530 Physique Résumé :
Modern cosmology has several unexplained astrophysical observations which are still paradoxical. Among those mysteries, we find discrepancy in cosmological parameters estimations, accelerated expansion of the Universe, cosmic magnetic fields origins and several small scale anomalies like compact clusters or galaxy-quasar associations and ultra high energy cosmic rays. Efforts made in the field of observational cosmology didn’t solve those questions. Moreover, several theories has been proposed as extensions or complete replacement of standard theories such as Einstein’s general relativity or standard model of particle physics to explain paradoxical observations. But, they failed to account for all classical tests and didn’t provide a consistent explanation of all observations. In this research, we adopt a different approach in which our interpretation of observations is re-examined in light of new and previously unconsidered effects contributing to cosmological data especially observed redshift. A new effect is predicted to be the result of the gravitational interaction between photons and constant magnetic fields creating gravitational waves. The energy carried by these waves is manifested as a photon redshift contributing to those observed redshifts. Contributions from this effect are misinterpreted as caused from Doppler Effect or gravitational redshift. Analytical methods and especially numerical methods are used in this thesis to estimate this new effect impacts. With analytical methods, new solutions are found for Maxwell’s equations proving a preservation of smooth primordial magnetic fields after recombination. With numerical methods, several codes such as SCOPE, RPC and extended version of CRPROPA are developed and is used to present possible explanations to a number misunderstood phenomena. Extensions to both codes ENZO and YT are used to study our redshift effect impacts
using cosmological simulations. The analysis of synthetic observations has shown a significant contribution of our redshift affecting revised models of Stephan’s Quintet members and cosmological parameters estimations especially Hubble constant. A large number of results has been achieved using our code and still need further confirmations after more development and extensions in future research
Note de contenu : Appends.
Diplôme : Doctorat En ligne : ../theses/physique/ABD7615.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11451 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité ABD/7615 ABD/7615 Thèse Bibliothèque principale Thèses Disponible
