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Artykuły w czasopismach na temat "Instabilité hydrodynamiques"
Viroulet, Sylvain, James L. Baker, Andrew N. Edwards i J. M. N. T. Gray. "Les instabilités hydrodynamiques dans les écoulements granulaires géophysiques". Reflets de la physique, nr 62 (czerwiec 2019): 32–36. http://dx.doi.org/10.1051/refdp/201962032.
Pełny tekst źródłaCerasi, P., P. Mills i J. J. Durussel. "Instabilite Hydrodynamique D'un Milieu Poreux Mal Consolide. Application a L'angiogenese". Archives of Physiology and Biochemistry 103, nr 3 (1.01.1995): C44. http://dx.doi.org/10.3109/13813459509037269.
Pełny tekst źródłaMcBain, Geordie Drummond. "The primitive Orr–Sommerfeld equation and its solution by finite elements". ANZIAM Journal 63 (20.09.2022): C168—C181. http://dx.doi.org/10.21914/anziamj.v63.17159.
Pełny tekst źródłaRozprawy doktorskie na temat "Instabilité hydrodynamiques"
Trouvé, Arnaud. "Instabilités hydrodynamiques et instabilités de combustion de flammes turbulentes prémélangées". Châtenay-Malabry, Ecole centrale de Paris, 1989. http://www.theses.fr/1989ECAP0097.
Pełny tekst źródłaEloy, Christophe. "Instabilité multipolaire de tourbillons". Aix-Marseille 2, 2000. http://www.theses.fr/2000AIX22048.
Pełny tekst źródłaPacitto, Grégory. "Instabilités hydrodynamiques à l'interface de ferrofluides en géométrie confinée". Paris 7, 2001. http://www.theses.fr/2001PA077107.
Pełny tekst źródłaRiedinger, Xavier. "Instabilité radiative d'un tourbillon dans un fluide stratifié". Aix-Marseille 1, 2009. http://www.theses.fr/2009AIX11053.
Pełny tekst źródłaVortices are widely present in geophysical flows at all scales. They are involved in the dynamics of flows as well as in their statistical properties. In order to identify precisely their role in the global properties of the flow it is important to know their individual dynamics as finely as possible. With this purpose, we study in this thesis through theoretical, numerical and experimental means, the stability properties of models of stratified vortices : The Lamb-Oseen vortex and a family of Taylor-Couette and Keplerian rotative °ows. We show, in particular, that these flows, stable in a homogeneous fluid, can become unstable in the presence of a stable stratification along their rotation axis. The three kinds of flows are subject to the same form of destabilisation, the radiative instability of which we describe the mechanism. For the Lamb-Oseen vortex, a comprehensive numerical study is performed by varying the Reynolds number and the Froude number which characterize the viscosity and the buoyancy of the fluid. For low Reynolds numbers, we show that the most unstable mode leads to an undulation of the vortex that we have obtained successfully in the experiments. For the Taylor-Couette flow generated by the rotation of a cylinder, the most unstable mode is also helical but it exhibits a more pronounced radiative structure. We also succeeded in obtaining this mode experimentally. The frequency and wavelength of the mode have been measured using shadowgraphy and the synthetic schlieren technique, and a very good agreement with the numerics has been demonstrated. Other numerical results are presented which show, in particular, that the radiative instability is only partially reduced by planetary rotation and that it could be present in Keplerian flows
Boulanger, Nicolas. "Dynamique d'un tourbillon en milieu stratifié : instabilité centrifuge et effets de l'inclinaison". Aix-Marseille 1, 2006. http://www.theses.fr/2006AIX11058.
Pełny tekst źródłaDauchy, Christophe. "Etude numérique d'une instabilité secondaire dans le sillage de cylindres finis". Aix-Marseille 2, 1995. http://www.theses.fr/1995AIX22200.
Pełny tekst źródłaBallesta, Pierre. "Instabilité de Faraday dans les fluides complexes". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2006. http://tel.archives-ouvertes.fr/tel-00811893.
Pełny tekst źródłaLefort, Eric. "Caractérisation des bifurcations et de la dynamique d'une lentille thermique par analyse spectrale". Rouen, 1987. http://www.theses.fr/1987ROUES019.
Pełny tekst źródłaDelorme, Barthélémy. "Etude expérimentale des conditions initiales de l'instabilité de Rayleigh-Taylor au front d'ablation en fusion par confinement inertiel". Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0490/document.
Pełny tekst źródłaNumerous designs and experiments in the domain of Inertial Confinement Fusion (ICF) show that, in both direct and indirect drive approaches, one of the main limitations to reach the ignition is the Rayleigh-Taylor instability (RTI). It may lead to shell disruption and performance degradation of spherically imploding targets. Thus, the understanding and the control of the initial conditions of the RTI is of crucial importance for the ICF program. In this thesis, we present an experimental and theoretical study of the initial conditions of the ablative RTI in direct drive, by means of two experimental campaigns performed on the OMEGA laser facility (LLE, Rochester). The first campaign consisted in studying the laser-imprinted ablative Richtmyer-Meshkov instability (RMI) which starts at the beginning of the interaction and seeds the ablative RTI.We set up an experimental configuration that allowed to measure for the first time the temporal evolution of the laser-imprinted ablative RMI. The experimental results have been interpreted by a theoretical model and numerical simulations performed with the hydrodynamic code CHIC. We show that the best way to control the ablative RMI is to reduce the laser intensity inhomogeneities. This can be achieved with targets covered by a layer of a low density foam. Thus, in the second campaign, we studied for the first time the effect of underdense foams on the growth of the ablative RTI. A layer of low density foam was placed in front of a plastic foil, and the perturbation was imprinted by an intensity modulated laser beam. Experimental data are presented : backscattered laser energy, target dynamic obtained by side-on selfemission measurement, and face-on radiographs showing the effect of the foams on the target areal density modulations. These data were interpreted using the CHIC code and the laser-plasma interaction code PARAX. We show that the foams noticeably reduce the amplitude of the laser intensity inhomogeneities and the level of the subsequent imprinted ablation front modulations. In conclusion, this thesis allowed us to develop an experimental platform and a suite of numerical tools for future, more detailed studies of hydrodynamic instabilities for ICFapplications
Latrache, Noureddine. "Étude expérimentale des modes supérieurs des instabilités d'écoulements newtoniens ou viscoélastiques dans le système de Couette-Taylor". Le Havre, 2005. http://www.theses.fr/2005LEHA0054.
Pełny tekst źródłaThis work appears in the context of the transition to the turbulence in the flows sheared with of current curve lines. We are interested to study the transition to the turbulence in the Couette-Taylor flow for liquid confined between two coaxial cylinders in differential rotation. For a newtonien liquid (for example, water), and when the two cylinders are in counter-rotation, the non- axisymmetric and instationery critical modes named Taylor spirals (SPI) or interpenetrating spiral (IPS) appear at the threshold of the instability. We have shown that these Taylor's spirals have the anomalous dispersion property. This anomalous dispersion of spirals permits to give in the setting of the Ginzburg-Landau theory a good interpretation of the stability of the source separating two counterpropagating spirals. The transition to turbulence in viscoelastic Couette-Taylor has been studied with polyethyleneoxide (PEO) solutions when the outer cylinder is rest. For the solutions with concentrations c [500,700] ppm (moderate elasticity), and close to the threshold of the instability, the base circular of Couette flow bifurcates to left and right counterapropagating spirals weakly non-linear and non coupled (inertioelastic effects). For a weak increase of the control parameter , the right and left counterpropagating spirals present a strong non-linear coupling witch appears by the existence of the intense spatial and temporal harmonic modes. The coupled counterapropagating spirals are described by the phenomenological equations of Ginzburg-Landau with added new terms permitting to generate the spatial and temporal harmonics. The transition to the turbulence is done via the apparition the turbulent spots (spatiotemporal intermittency). For the large concentrations of PEO c [800,900] ppm (large elasticity), the primary instability mode is formed by the superposed left and right spirals that they bifurcate brutally to pattern formed by large domains containing spirals waves (elastic effects). For large values of the control parameter , the domains subdivided and become less large. The spirals disappear inside the domains. These domains multiply with the control parameter , and the flow transit to the turbulence regime (elastic turbulence)
Książki na temat "Instabilité hydrodynamiques"
Charru, Franc ʹois. Instabilite s hydrodynamiques. Les Ulis, France: EDP Sciences, 2007.
Znajdź pełny tekst źródłaCharru, François. Instabilités hydrodynamiques. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7.
Pełny tekst źródłaCharru, François. Instabilités Hydrodynamiques. EDP Sciences, 2021.
Znajdź pełny tekst źródłaCzęści książek na temat "Instabilité hydrodynamiques"
"5 Instabilité visqueuse des écoulements parallèles". W Instabilités hydrodynamiques, 137–64. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7-007.
Pełny tekst źródła"5 Instabilité visqueuse des écoulements parallèles". W Instabilités hydrodynamiques, 137–64. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7.c007.
Pełny tekst źródła"4 Instabilité non visqueuse des écoulements parallèles". W Instabilités hydrodynamiques, 103–36. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7-006.
Pełny tekst źródła"4 Instabilité non visqueuse des écoulements parallèles". W Instabilités hydrodynamiques, 103–36. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7.c006.
Pełny tekst źródła"Frontmatter". W Instabilités hydrodynamiques, i—iv. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7-fm.
Pełny tekst źródła"Index". W Instabilités hydrodynamiques, 381–86. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7-016.
Pełny tekst źródła"3 Écoulements ouverts : notions de base". W Instabilités hydrodynamiques, 87–102. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7-005.
Pełny tekst źródła"11 Systèmes dynamiques et bifurcations". W Instabilités hydrodynamiques, 315–56. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7-013.
Pełny tekst źródła"9 Dynamique non linéaire d’une onde dispersive". W Instabilités hydrodynamiques, 265–88. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7-011.
Pełny tekst źródła"10 Dynamique non linéaire des systèmes dissipatifs". W Instabilités hydrodynamiques, 289–314. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0110-7-012.
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