Academic literature on the topic 'Interaction entre les ondes et la turbulence'
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Journal articles on the topic "Interaction entre les ondes et la turbulence":
Krawczynski, Jean-François, Luminata Danaila, Bruno Renou, and Paul Dimotakis. "Interaction entre des anneaux cohérents de vorticité et la turbulence." Mécanique & Industries 8, no. 2 (March 2007): 93–99. http://dx.doi.org/10.1051/meca:2007026.
Harouadi, Farid, and Salim Boulahrouz. "Etude et Analyse de la Combustion Turbulente dans un Moteur Alimenté en Gaz Naturel." Journal of Renewable Energies 3, no. 2 (December 31, 2000): 93–103. http://dx.doi.org/10.54966/jreen.v3i2.914.
Gouidmi, Hamza, Abdelhadi Beghidja, Razik Benderradji, Nabila Ihaddadène, and Elhadj Raouache. "Etude numérique d’une structure de choc Phénomène d’interaction choc/couche limite." Journal of Renewable Energies 20, no. 3 (September 30, 2017): 397–413. http://dx.doi.org/10.54966/jreen.v20i3.636.
Maze, R., Y. Camus, and J. Y. le Tareau. "Formation de gradients thermiques a la surface de l'ocean, au-dessus d'un talus, par interaction entre les ondes internes et le melange du au vent." ICES Journal of Marine Science 42, no. 3 (January 1, 1986): 221–40. http://dx.doi.org/10.1093/icesjms/42.3.221.
BORGHI, Roland. "Interaction entre turbulence et combustion." Physique énergétique, November 1987. http://dx.doi.org/10.51257/a-v1-a1640.
Dissertations / Theses on the topic "Interaction entre les ondes et la turbulence":
Mohamed, Ahmed. "Nonlinear inertial waves focusing in rotating flows." Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2023. http://www.theses.fr/2023ECDL0058.
We investigate the propagation of inertial waves generated by the oscillation of an axisymmetric torus in a rotating fluid. These inertial waves propagate from the oscillating torus with a propagation angle θf, determined by the dispersion relation. They focus to a focal region where nonlinear interactions may induce turbulence. Our study employs direct numerical simulations to model this flow, considering both linear and nonlinear regimes, and using two torus forcing configurations. The first model simplifies the torus as a local volume force using a Dirac delta function (Dirac ring) along the torus’s oscillation direction in the momentum conservation equations. The second, more realistic model implements a 3D torus using the penalization method. Our findings reveal the emergence of a central vortex as a result of the nonlinear interactions of the propagated inertial waves. In the case of the Dirac ring and the linear regime, our results demonstrate a relationship between vertical kinetic energy and propagation angle at thefocal point, with maximum energy occurring at θf = 35o. Similarly, in the 3D torus forcing scenario, both linear and nonlinear simulations indicate an optimal angle of θf = 30o, leading to maximum vertical velocity and dissipation, signifying efficient energy transfer from the oscillating source to the focal region. In the nonlinear regime, we show the detailed spectral distribution of kinetic energy within the focal zone and conduct spatio-temporal analysis of the velocity field. This analysis identifies triadic resonances of the inertial waves, which drive the generation of a turbulent patch and a large-scale mode similar to the geostrophic mean flow
Crespo, Matthieu. "Etude de l'interaction entre une onde de choc et une turbulence cisaillée en présence de gradients moyens de température et de masse volumique." Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT039H/document.
This study sheds some light on the effects of a specific sheared flow over the shock / turbulence interaction phenomenon. An efficient and modular computational tool using an oriented object approach has first been developed in order to carry out direct numerical simulations of this configuration. The use of high order shock capturing schemes allows to solve accurately the turbulent flow, even in presence of physical discontinuities. A detailed study concerning the effects of this specific mean shear on the turbulent flow has then been conducted in a shock-free configuration. This preliminary study emphases some significant parameters of this flow configuration. In a second step, DNS of the interaction between the turbulent shear flow and a normal shock ware are performed. These simulations are compared to the isotropic turbulence / shock interaction situation, which allows to underline the activationof specific mechanisms due to the presence of the mean shear in the upstream flow. An interesting database is now available and can be used to assess and improve turbulence models. This is also an interesting point of view for studying the shock/boundary layer interaction phenomenon
Galmiche, Martin. "Interaction turbulence-champs moyens et ondes de gravités internes dans un fluide stratifié." Toulouse, INPT, 1999. http://www.theses.fr/1999INPT017H.
Depommier, Guillaume. "Analyse de l'interaction entre un jet turbulent et un tourbillon." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00814804.
Dochy, Thibaut. "Interaction entre ultrasons de puissance et fluides complexes." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30298/document.
The evolution of an initially homogeneous solution consisting of two species subjected to a thermal gradient which generates a mass transfer, which can lead to the separation species from the binary fluid, is studied. The configuration chosen to study the separation is a rectangular (or parallelepipedic) cell, horizontal and placed in the gravitational field. The presence of a piezoelectric source on one of the vertical walls of the cavity makes it possible to generate a stationary flow on a large scale. The flow is induced by the propagation of ultra-sonic waves within the viscous fluid : the dissipation of the acoustic energy of the wave within the fluid is called Eckart streaming. We seek to optimize the separation by combining thermal gradient and acoustic source. The first part consists of the study of the isothermal flow generated by the ultrasonic wave in a monoconstituent fluid. After calculating the acoustic intensity field with the Rayleigh integral, the profile is implemented in a Comsol Multiphysics finite element code. The numerical results are compared with previous experimental results. In a second part, we consider a cavity containing a binary fluid. A configuration heated from the top is privilegied to allow the insertion of an acoustic source. The separation (difference of mass fraction between the two ends of the cell) is determined analytically using the Maple software as a function of the control parameters of the problem. 2D and 3D numerical simulations showed a good agreement between the analytical and numerical results, for a constant acoustic parameter. The problem considered depends on eight dimensionless parameters. Three of them are specific to the nature of the binary fluid : the Lewis number Le, the Prandtl number Pr and the separation factor ψ. There are then two control parameters, the thermal Rayleigh number Ra and the adimensional acoustic force A. Finally, the other dimensionless parameters are the two aspect ratios of the cavity, as well as the relative thickness of the beam
Muraglia, Magali. "Modélisation et simulation de l'interaction multi-échelle entre îlots magnétiques et la microturbulence dans les plasmas de fusion magnétisés." Aix-Marseille 1, 2009. http://www.theses.fr/2009AIX11052.
In a tokamak, it exists many kind of instability at the origin of a dammage of the confinement and worst of a lost of a confinement. This phd presents a study of the dynamics of a magnetic island in presence of turbulence in magnetized plasmas. More precisely, the goal is to understand the multiscales interaction between turbulence, generated by a pressure gradient and the magnetic field curvature, and a magnetic island formed thanks to a tearing mode. Thanks to the derivation of a 2D slab model takking account both tearing and interchange instabilities, theoretical and numerical linear studies show the pressure effect on the magnetic island linear formation and show interchange modes are stabilized in presence of a strong magnetic field. Then, a numerical nonlinear study is presented in order to understand how the interchange mechanism affects the nonlinear dynamics of a magnetic island. It is showned that the pressure gradient and the magnetic field curvature affect strongly the nonlinear evolution of a magnetic island through dynamics bifurcations. The nature of these bifurcations should be characterized in fonction of the linear situation. Finally, the last part of this phd is devoted to the study of the origin of the nonlinear poloidal rotation of the magnetic island. A model giving the different contributions to the rotation is derived. It is showned, thanks to the model and to the numerical studies, that the nonlinear rotation of the island is mainly governed by the E x B poloidal flow and/or by the nonlinear diamagnetic drift
Leconte, Michaël. "Interaction entre écoulements cisailles et transport turbulent dans les plasmas de fusion magnétique." Aix-Marseille 1, 2008. http://www.theses.fr/2008AIX11047.
Queka, Abdulwahab. "Etude expérimentale des régimes instables du système faisceau d'ions-plasma : analyse de la turbulence acoustique ionique." Aix-Marseille 1, 2001. http://www.theses.fr/2001AIX11016.
Moreau, Julien. "Interaction entre un jet et un tourbillon compressé. Etude expérimentale de l'aérodynamique et de mélange." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2003. http://tel.archives-ouvertes.fr/tel-00007174.
Lagraa, Boualem. "Interaction entre les mouvements à grandes échelles et les structures pariétales dans une couche limite turbulente." Valenciennes, 2002. https://ged.uphf.fr/nuxeo/site/esupversions/84542f6a-fa43-4a55-b554-3c8fa850e79d.
L'objectif de ce travail vise à une meilleure compréhension des mécanismes de la turbulence pariétale. Différentes approches expérimentales sont utilisées, la Vélocimétrie Laser Doppler (VLD), la Vélocimétrie par images de particules (PIV), et la polarographie. Le caractère non intrusif de ces méthodes a permis de préciser le comportement dynamique des structures cohérentes au voisinage de la paroi. La mise en œuvre de l'analyse conditionnelle effectuée sur les différents signaux de vitesse et du frottement, a permis de déterminer l'intensité, l'échelle et la fréquence des différents événements. L'analyse des corrélations spatio-temporelles montre que les tourbillons en épingle à cheveux évoluent par 'paquets' en formant une structure inclinée par rapport à la paroi. Les mesures à l'aide de la PIV confirment ces résultats