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Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Li, Yan-Ling. "Numerical simulations of rotating stall in axial flow compressors." Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/47428/.

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Gas turbine compressor performance may encounter deterioration during service for various reasons such as damage by debris from the casing or foreign objects impacting on the blades, typically near the rotor's tip. Moreover, mal-schedule of Variable Stator Vanes (VSVs) during start-up may also result in performance deterioration and reduction in the surge margin. Ability to assess the effect of compressor deterioration using Computational Fluid Dynamics (CFD) is important at both design stage and in service. Compressor blade damage breaks the cyclic symmetry and the VSVs mal-schecule creates m

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2

Appelquist, Ellinor. "The rotating-disk boundary-layer flow studied through numerical simulations." Doctoral thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200827.

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This thesis deals with the instabilities of the incompressible boundary-layer flow thatis induced by a disk rotating in otherwise still fluid. The results presented include bothwork in the linear and nonlinear regime and are derived from direct numerical sim-ulations (DNS). Comparisons are made both to theoretical and experimental resultsproviding new insights into the transition route to turbulence. The simulation codeNek5000 has been chosen for the DNS using a spectral-element method (SEM) witha high-order discretization, and the results were obtained through large-scale paral-lel simulation

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3

Appelquist, Ellinor. "Direct numerical simulations of the rotating-disk boundary-layer flow." Licentiate thesis, KTH, Mekanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146087.

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This thesis deals with the instabilities of the incompressible boundary-layer flow that is induced by a disk rotating in otherwise still fluid. The results presented are mostly limited to linear instabilities derived from direct numerical simulations (DNS) but with the objective that further work will focus on the nonlinear regime, providing greater insights into the transition route to turbulence. The numerical code Nek5000 has been chosen for the DNS using a spectral-element method in an effort to reduce spurious effects from low-order discretizations. Large-scale parallel simulations have b

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4

Lygren, Magne. "Simulations of Turbulent Flow between a Rotating and a Stationary Disk." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-409.

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<p>The main focus of this thesis is turbulent flow between a rotating and a stationary disk. The extension of the disks is assumed to be large enough to prevent the outer boundary conditions to influence the flow of the region of interest. This flow is driven by the shear between the disks, but an imbalance between centrifugal and pressure forces in the radial direction induce a radial cross-flow. The result is a complex three-dimensional flow where the direction of the mean flow varies with the axial position. Direct numerical simulations (DNS) and large eddy simulations (LES) have been used

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5

Wang, Weiyi. "Numerical and Experimental Investigation of Dense Granular Flow of Highly Concave Particles : Non-Local Modelling for Inclined Plane and Rotating Drum Geometries." Electronic Thesis or Diss., Université de Montpellier (2022-....), 2024. http://www.theses.fr/2024UMONS051.

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Les matériaux granulaires sont une classe de matériaux utilisés de longue dates par les humains. Ils sont encore de nos jours omniprésents dans notre vie quotidienne, au travers de substances comme le riz, le sel, le gravier, le charbon, le sable ou la neige, pour n'en siter que quelques uns. Ils interviennent très largement dans l'industrie, allant de l'agriculture et de la construction à la pharmacie et à la plupart des biens. En réalité, les matériaux granulaires sont le deuxième matériau le plus manipulé en termes de poids dans l'industrie mondiale, dépassés uniquement par l'eau cite{DeGen

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6

ARAUJO, JOSÉ HENRIQUE CARNEIRO DE. "NUMERICAL SIMULATIONS VIA FINITE ELEMENT OF VISCOUS FLOW BETWEEN CONCENTRIC AND ECCENTRIC CYLINDERS WITH ROTATING INNER AND VARIABLE VISCOSITY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1987. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19059@1.

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COMISSÃO NACIONAL DE ENERGIA NUCLEAR<br>Efetuou-se um estudo numérico do escoamento entre cilindros concêntricos e excêntricos girantes com efeitos de dissipação viscosa presente. Assumiu-se que o cilindro interno estava girando com uma velocidade angular constante e que o externo estava fixo. Assumimos a condição de contorno de não deslizamento para velocidade em ambas as paredes. A temperatura do fluido nas paredes dos cilindros foi assumida constante e seu campo assumimos ser governado por efeitos de convecção e condução, com uma fonte de energia proveniente da dissipação viscosa do escoame

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7

Feiz, Homayoon. "LES of Multiple Jets in Cross-Flow Using a Coupled Lattice Boltzmann-Navier-Stokes Solver." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14040.

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Three-dimensional large-eddy simulations (LES) of single and multiple jets in cross-flow (JICF) were conducted using the 19-bit Lattice Boltzmann Equation (LBE) method coupled with a conventional Navier-Stokes (NS) finite-volume scheme. In this coupled LBE-NS approach, the LBE-LES was employed to simulate the flow inside jet nozzles, while the NS-LES was used to simulate the cross-flow. The key application area was to study the micro-blowing technique (MBT) for drag control similar to recent experiments at NASA/GRC. A single jet in the cross-flow case was used for validation purposes, and re

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8

Lamballais, Éric. "Simulations numériques de la turbulence dans un canal plan tournant." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0016.

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L'ecoulement en canal plan tournant est etudie par simulation numerique directe et des grandes echelles. Dans ce but, un code resolvant les ecoulements de navier-stokes incompressibles est developpe, en apportant un soin particulier a la precision des methodes numeriques utilisees. Dans le cadre de la simulation des grandes echelles, une correction du modele sous-maille a viscosite turbulente spectrale est proposee. Cette modification consiste a prendre en compte les ecarts du spectre d'energie par rapport a un spectre de kolmogorov. L'etude prealable de l'ecoulement en canal en l'absence de r

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9

Gundersen, Ted Ørjan Kjellevik. "Modelling of Rotating Turbulent Flows : Computer simulation of turbulent backward-facing step flow with system rotation." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13925.

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An investigation of how different levels of turbulence modelling tackle the effects of system rotation has been performed. Ranging from simple one-equation models to large-eddy simulations, different approaches have been considered by means of a literature study and numerical calculations of turbulent flow over a backward-facing step subjected to spanwise rotation. The computed results were compared with results from direct numerical simulations.The literature study revealed that simple linear eddy-viscosity turbulence models are unable to predict any effects on the turbulence field due to sys

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10

Sanchez, Marc. "Etude des extracteurs d'air hybrides éoliens : conception de géométries et analyse des écoulements." Thesis, Perpignan, 2015. http://www.theses.fr/2015PERP0040/document.

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Ce travail de thèse concerne l'étude d'extracteurs d'air hybrides éoliens. Il se décompose en des investigations amont et appliquées. Dans la partie amont, des simulations fines ont été effectuées en conduite carrée avec et sans rotation, pour des nombres de Reynolds turbulents de l'ordre de 600, afin d'analyser l'impact de la rotation sur la turbulence. Elles ont montré que la rotation rompt la symétrie de l'écoulement. La partie appliquée est dédiée à la conception d'une nouvelle géométrie d'extracteur d'air. Cette géométrie a été proposée à partir de l'analyse de simulations RANS. Ses perfo

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11

Subramanian, Arunprasath. "Contribution to Aerothermal Study of a Film Cooling Geometric Design using ZnO Phosphorescence Thermography and Numerical Simulations." Electronic Thesis or Diss., Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2022. http://www.theses.fr/2022ESMA0006.

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Le refroidissement par film froid des aubes des turbines aéronautiques d’avion est utilisé depuis quelques décennies pour augmenter la température d'entrée de la turbine (TIT) et ainsi augmenter la poussée, et également pour prolonger la durée de vie de l'aube de turbine. Les normes d'émission strictes des polluants encouragent l'amélioration de l'efficacité globale de la turbine et donc l’optimisation du processus de refroidissement par film. C’est une technique par convection forcée dans laquelle un jet froid est injecté à travers des trous discrets à la surface de l'aube de turbine de maniè

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12

Lewis, Tanat. "Numerical simulation of buoyancy-induced flow in a sealed rotating cavity." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285311.

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13

Li, Yiguang. "Three-Dimensional Flow and Performance Simulation of Multistage Axial Flow Compressors." Thesis, Cranfield University, 2000. http://dspace.lib.cranfield.ac.uk/handle/1826/4591.

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\Yith the current develop111ent in computer technology and Computational Fluid D)"n<'tlllics techniques, t.he si11utlation within axial flow compressors becomes 1110re and 1110re pract.ical and beneficial to the compressor designs. Due to the insufficient capabilit)" of today's COll1put.ers for three-dimensional unsteady flow 1110delling of 111Ult i~Llg(' axial flow compressors, sophisticated models of steady state flow and perfor111ance 1110delling of the C0111prcssors deserve to be thoroughly investigated. In l1utltistage C0111pressor sinlulations with steady state methods, frame of referenc

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14

Johansson, Mats. "Simulation of a multi phase flow in a rotating-lid driven cylinder." Thesis, Umeå universitet, Institutionen för fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-82177.

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This report describes the development of a software for computing viscous incompressiblemultiphase ows. The software does this with solving the coupled non-linear Navier-Stokes(Fluid) and the Cahn-Hilliard (Phase-Field) equations using a Finite Element Method. Thereason for the development is to produce a simulation tool, which eventually is capable ofsimulating the ow of uids inside the OptusAir aeronator manufactured by the Sorubincompany. The solving software developed is built on the ParMetis, PETSc and OpenMPIframeworks. Our primary benchmark has been a geometry resembling the OptusAir pr

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15

Douglas, Neil. "Self-rotating life-forms, mechanical connections and simulation of deformable bodies in inviscid flow." Thesis, University of Surrey, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531369.

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16

Durlofsky, Louis J. "Topics in fluid mechanics : I. flow between finite rotating disks II. simulation of hydrodynamically interacting particles in stokes flow." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15049.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1986.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.<br>Includes bibliographies.<br>by Louis J. Durlofsky.<br>I. Flow between finite rotating disks II. Simulation of hydrodynamically interacting particles in stokes flow.<br>Ph.D.

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17

Yu, Guangxu. "Richardson's locality assumption for stratified and rotating turbulent flows using kinematic simulation." Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401136.

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18

Berta, Pitz Diogo. "Direct and large-eddy simulation of buoyancy-induced flows in rotating cavities." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/846515/.

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In this research a spectral element method is used to perform direct numerical simulation (DNS) and implicit large-eddy simulation (LES) of flows induced by centrifugal buoyancy in rotating cavities. These flows occur, for instance, in the compressor cavities of gas turbines internal air systems, in which cooling air is used to extract heat from compressor disks. Buoyancy-induced flows are inherently challenging to study using computational fluid dynamics (CFD), since turbulence models based on the Reynolds-averaged Navier-Stokes (RANS) equations are not able to provide an accurate description

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19

Wen, Yang. "Experimental and numerical investigations of rotating flows with deformable free surface." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS455.

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Ce travail est une contribution à la compréhension des instabilités dans les écoulements tournants à surface libre déformable. La configuration étudiée est un récipient cylindrique partiellement rempli d'eau ou d'un mélange eau-glycérine, et la rotation est créée par un disque tournant situé au fond du récipient. Ce type d'écoulements est le siège de plusieurs familles d'instabilités en fonction des paramètres (nombres de Froude et de Reynolds, rapport de forme). Ces investigations utilisent des simulations stationnaires et instationnaires à l'aide des deux codes maison ROSE et Sunfluidh en co

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20

Stenberg, Erik. "On numerical simulations of turbulent flows subjected to system rotation." Thesis, KTH, Mekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194499.

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Different aspects of numerical simulations of turbulent flows are assessed by considering a fully-developed turbulent channel flow that is rotating in the spanwise direction. Differences between differential and explicit algebraic Reynolds-stress models (RSMs) are investigated theoretically and numerically. Simulation results are compared with existing DNS-data. Both families of RSMs are demonstrated to achieve good qualitative agreement with the DNS. The results constitutes a demonstration of the validity of the so called extended weak-equilibrium assumption for systems with a superimposed so

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21

Peres, Noele. "A 3D pseudospectral method for cylindrical coordinates. Application to the simulations of rotating cavity flows." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4309/document.

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La simulation d'écoulements dans des cavités cylindriques en rotation présente une difficulté particulière en raison de l'apparition de singularités sur l'axe. Le présent travail propose une méthode collocative pseudospectrale suffisamment efficace et précise pour surmonter cette difficulté et résoudre les équations 3D de Navier-Stokes écrites en coordonnées cylindriques. Cette méthode a été développée dans le cadre des différentes études menées au laboratoire M2P2, utilisant une méthode collocative de type Chebychev dans les directions radiale et axiale et Fourier-Galerkin dans la direction a

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22

Sundström, Elias. "Flow instabilities in centrifugal compressors at low mass flow rate." Doctoral thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217821.

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A centrifugal compressor is a mechanical machine with purpose to convert kineticenergy from a rotating impeller wheel into the fluid medium by compressingit. One application involves supplying boost air pressure to downsized internalcombustion engines (ICE). This allows, for a given combustion chamber volume,more oxygen to the combustion process, which is key for an elevated energeticefficiency and reducing emissions. However, the centrifugal compressor is limitedat off-design operating conditions by the inception of flow instabilities causingrotating stall and/or surge. These instabilities ap

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23

Marstorp, Linus. "Subgrid-scale modelling for large-eddy simulation invluding scalar mixing in rotating turbulent shear flows." Licentiate thesis, KTH, Mechanics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3916.

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<p>The aim of the present study is to develop subgrid-scale models that are relevant for complex flows and combustion. A stochastic model based on a stochastic Smagorinsky constant with adjustable variance and time scale is proposed. The stochastic model is shown to provide for backscatter of both kinetic energy and scalar variance without causing numerical instabilities. A new subgrid-scale scalar flux model is developed using the same kind of methodology that leads to the explicit algebraic scalar flux model, EASFM, for RANS. The new model predicts the anisotropy of the subgrid-scales in a m

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24

Marstorp, Linus. "Subgrid-scale modelling for large-eddy simulation including scalar mixing in rotating turbulent shear flows." Licentiate thesis, KTH, Mekanik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3916.

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The aim of the present study is to develop subgrid-scale models that are relevant for complex flows and combustion. A stochastic model based on a stochastic Smagorinsky constant with adjustable variance and time scale is proposed. The stochastic model is shown to provide for backscatter of both kinetic energy and scalar variance without causing numerical instabilities. A new subgrid-scale scalar flux model is developed using the same kind of methodology that leads to the explicit algebraic scalar flux model, EASFM, for RANS. The new model predicts the anisotropy of the subgrid-scales in a more

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25

Guleren, Kursad Melih. "Large-eddy simulation of wall-bounded flows subjected to curvature and rotation." Thesis, University of Manchester, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595659.

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This PhD thesis considers the analysis and the interpretation of the complex turbulent flows subjected to curvature and rotation effects. To achieve this goal, largeeddy simulation (LES) is performed for various wall-bounded flow problems. For the validation and verification purposes, the adopted finite-volume code is tested by considering fully developed channel and duct flow problems. The behaviour of the subgrid-scale (SOS) models and the spatial schemes are investigated in detail for the channel and duct flows subjected to orthogonal rotation. Among the tested SOS models and the spatial sc

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26

Abdel-Wahab, Samer. "Large Eddy Simulation of Flow and Heat Transfer in a Staggered 45° Ribbed Duct and a Rotating 90° Ribbed Duct." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/35919.

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For the past several years there has been great effort in the analysis of internal duct cooling. The steady increase in power output and thermal efficiency requirements for gas turbine engines has called for significant advancement in turbine blade internal duct cooling technology. Numerical analysis of turbulent duct flow has been largely limited to Reynolds Averaged Navier-Stokes (RANS) simulations. This is because of the low computational requirements of such calculations relative to Large Eddy Simulation (LES) and Direct Numerical Simulation (DNS). However, the tides have started to turn i

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27

Navarro, García Roberto. "A numerical approach for predicting flow-induced acoustics at near-stall conditions in an automotive turbocharger compressor." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/44114.

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Se realiza un modelo CFD-3D de un compresor centrífugo. Se determina la configuración numérica adecuada para simular puntos de funcionamiento cercanos a bombeo. Se validan los resultados frente a ensayos experimentales realizados en cámara anecoica. Se analizan los resultados, justificando las características del ruido emitido por el compresor a partir de los patrones de flujo encontrados. En particular, se analiza el flujo en la holgura entre los álabes y la carcasa del compresor y en la parte posterior del rodete. Por último, se analiza la influencia de las geometrías aguas arriba del compre

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28

Fransen, Rémy. "LES based aerothermal modeling of turbine blade cooling systems." Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/10012/1/fransen.pdf.

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This PhD dissertation, conducted as part of a CIFRE research project between TURBOMECA and CERFACS in partnership with the VKI, deals with improving performance of axial turbines from helicopter engines. One of the most critical design points of such engines is the control of the high pressure turbine blade lifetime which face the high temperatures from the combustor. Today, industrial numerical aerothermal predictions of the flows around the blade (in the vein and in its cooling system) are performed with the Reynolds Averaged Navier-Stokes (RANS). Thanks to the increasing computational power

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29

Ferrer, Esteban. "A high order Discontinuous Galerkin - Fourier incompressible 3D Navier-Stokes solver with rotating sliding meshes for simulating cross-flow turbines." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:db8fe6e3-25d0-4f6a-be1b-6cde7832296d.

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This thesis details the development, verification and validation of an unsteady unstructured high order (≥ 3) h/p Discontinuous Galerkin - Fourier solver for the incompressible Navier-Stokes equations on static and rotating meshes in two and three dimensions. This general purpose solver is used to provide insight into cross-flow (wind or tidal) turbine physical phenomena. Simulation of this type of turbine for renewable energy generation needs to account for the rotational motion of the blades with respect to the fixed environment. This rotational motion implies azimuthal changes in blade aero

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30

Herbach, Richard. "Ecoulement laminaire d'un fluide réfrigérant en canal rectangulaire tournant : simulation numérique bidimensionnelle." Bordeaux 1, 1989. http://www.theses.fr/1989BOR10537.

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Etude de l'influence d'une rotation d'entrainement des parois sur la circulation secondaire d'un fluide avec ou sans transfert de chaleur. On presente un modele stationnaire qui permet des positions et orientations variables de l'axe de rotation

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31

GUIDA, ROBERTO. "Design and commissioning of a rotating test facility simulating a LPT hub cavity system for the investigation of cavity flows in aeroengines." Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/929001.

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32

Sewall, Evan Andrew. "Large Eddy Simulations of Flow and Heat Transfer in the Developing and 180° Bend Regions of Ribbed Gas Turbine Blade Internal Cooling Ducts with Rotation - Effect of Coriolis and Centrifugal Buoyancy Forces." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29858.

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Increasing the turbine inlet temperature of gas turbine engines significantly increases their power output and efficiency, but it also increases the likelihood of thermal failure. Internal passages with tiny ribs are typically cast into turbine blades to cool them, and the ability to accurately predict the flow and heat transfer within these channels leads to higher design reliability and prevention of blade failure resulting from local thermal loading. Prediction of the flow through these channels is challenging, however, because the flow is highly turbulent and anisotropic, and the presenc

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33

Valcke, Sophie. "Coalescence de tourbillons océaniques en milieu stratifié tournant : une étude numérique." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10084.

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Les tourbillons oceaniques de meso-echelle, tels les anneaux du gulfstream, sont des structures energetiques, influencant considerablement les circulations oceaniques generales et ayant probablement un impact non negligeable sur la climatologie globale. La coalescence (fusion) de tels tourbillons est etudiee par simulations numeriques basees sur un modele quasi-geostrophique et sur un modele aux equations primitives, a deux ou trois couches. L'influence de la stratification sur la coalescence est analysee a l'aide de divers modeles simples de tourbillons. Chaque tourbillon est represente par u

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34

Gasser, Jean-Claude. "Études d'écoulements tournants : application à l'atomisation MHD." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0104.

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L'evolution actuelle de la metallurgie des poudres tend a orienter la fabrication vers des granulometries de plus en plus fines, typiquement de l'ordre de 50 microns. Dans ce memoire, nous proposons l'etude d'un nouveau concept d'atomisation base sur l'utilisation d'un champ magnetique tournant. Les forces engendrees par le dispositif electromagnetique entrainent en rotation le metal liquide et l'ecoulement externe prend la forme d'un voile conique que l'on peut aisement desintegrer au moyen de jets gazeux. Un prototype utilisant du mercure nous a permis de demontrer la faisabilite d'un tel pr

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35

El, Anadouli Mohamed. "Étude des instabilités imparfaites de Couette-Taylor." Vandoeuvre-les-Nancy, INPL, 1994. http://www.theses.fr/1994INPL117N.

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Ce mémoire est consacré à l'étude des instabilités imparfaites de l'écoulement de Couette-Taylor en géométrie fine et à faible vitesse de rotation. Dans le premier chapitre, nous effectuons l'analyse de la stabilité linéaire pour différents rapports de rayons qui définit les paramètres critiques de l'écoulement. Pour tenir compte des effets de bords nous recourrons à l'analyse quasi-linéaire. Ces effets se traduisent par la présence du terme quadratique dans l'équation de ginzburg-landau. Ceci fait l'objet de notre deuxième chapitre. Le troisième chapitre est consacré à la description de la mé

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Crevel, Flore. "Simulation numérique de l'écoulement en régime de pompage dans un compresseur axial multi-étage." Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00929734.

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Dans le contexte économique et environnemental actuel, la prochaine génération de moteurs d'avion devra offrir opérabilité, compacité et hauts rendements. Les compresseurs demeurent une des pièces critiques de ces moteurs, et leur conception un challenge. À débit réduit, leur plage de fonctionnement est contrainte par la limite de pompage, phénomène hautement instable et dangereux. À ce jour, peu d'études expérimentales sur un compresseur en situation de pompage ont été réalisées, étant donné le danger inhérent pour les installations. Dans ce cadre, la simulation numérique peut apporter des in

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Cortazar, Miguel Angel. "Le Cavermod, modèle physique de l'érosion de cavitation : qualification expérimentale et numérique." Université Joseph Fourier (Grenoble ; 1971-2015), 1994. http://www.theses.fr/1994GRE10089.

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Le cavermod est un dispositif entièrement original destiné à simuler les tourbillons cavitants dont l'efficacité agressive dans les machines hydrauliques a été remarquée depuis plusieurs années. Ce dispositif permet de fixer la valeur des trois paramètres qui caractérisent le tourbillon cavitant: son taux de rotation, sa taille et sa vitesse d'implosion. L'étude expérimentale porte à la fois sur la réalisation du dispositif, sur l'équipement de mesure nécessaire à l'observation de l'écoulement crée (durée de vie: quelques millisecondes, vitesse d'implosion comprise entre 70 et 700 m/s), sur l'

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Lancial, Nicolas. "Effets de la rotation sur la dynamique des écoulements et des transferts thermiques dans les machines électriques tournantes de grande taille." Thesis, Valenciennes, 2014. http://www.theses.fr/2014VALE0021/document.

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EDF exploite sur son parc de production de nombreuses machines électriques tournantes. Les contraintes thermiques subies par celles-ci engendrent des échauffements locaux qui nuisent à leur intégrité. Le présent travail contribue à fournir des méthodes de calcul adaptées à la détection et à la localisation des points chauds. Il participe à améliorer la compréhension des écoulements en rotation et leurs effets sur les transferts thermiques. Plusieurs dispositifs expérimentaux, de complexité ascendante, ont été utilisés pour comprendre et valider les simulations numériques. Une première étude su

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Andreica, Ana Maria. "Optimisation énergétique de chaînes de conversion hydroliennes : modélisation, commandes, et réalisations expérimentales." Grenoble INPG, 2009. https://theses.hal.science/tel-00876949.

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Les hydroliennes représentent une des ressources d'énergie renouvelable qui a encore besoin d'études exploratoires et d'une réelle finalité pratique. Les hydroliennes sont des turbines qui récupèrent l'énergie cinétique des courants fluviaux ou marins. Equivalentes quelque part aux éoliennes, elles seront plus compactes à puissance égale car l'eau est mille fois plus dense que l'air. L'étude présentée dans le cadre de cette thèse s'inscrit dans un programme de recherche multidisciplinaire et a pour objet le concept HARVEST basé sur une structure verticale nommée colonne qui est composée d'un e

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Beckstein, Pascal. "Methodenentwicklung zur Simulation von Strömungen mit freier Oberfläche unter dem Einfluss elektromagnetischer Wechselfelder." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-232474.

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Im Bereich der industriellen Metallurgie und Kristallzüchtung treten bei zahlreichen Anwendungen, wo magnetische Wechselfelder zur induktiven Beeinflussung von leitfähigen Werkstoffen eingesetzt werden, auch Strömungen mit freier Oberfläche auf. Das Anwendungsspektrum reicht dabei vom einfachen Aufschmelzen eines Metalls in einem offenen Tiegel bis hin zur vollständigen Levitation. Auch der sogenannte RGS-Prozess, ein substratbasiertes Kristallisationsverfahren zur Herstellung siliziumbasierter Dünnschichtmaterialien, ist dafür ein Beispiel. Um bei solchen Prozessen die Interaktion von Magnetf

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De, Monaco Gaetano. "3D finite volume simulations of dense granular flow inside rotating cylinders." Tesi di dottorato, 2015. http://www.fedoa.unina.it/10410/1/demonaco_gaetano_27.pdf.

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Granular materials are widely diffused in industry as well as in nature, but a reliable and effective description of their motion is still at a rather early stage of development. Among the benchmark problems of granular dense flow, the rotating drum is one of the most challenging, yet intriguing and technologically relevant. In proper ranges of operating conditions, granular materials inside rotating drums display a continuum motion near their free surface. The motion of those discrete systems has been studied both experimentally and through Discrete Element Method (DEM) numerical simulations;

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Sezer-Uzol, Nilay. "Unsteady flow simulations around complex geometries using stationary or rotating unstructured grids." 2006. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1702/index.html.

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Finke, Konstantin. "Kinematic dynamo onset and magnetic field saturation in rotating spherical Couette and periodic box simulations." Doctoral thesis, 2013. http://hdl.handle.net/11858/00-1735-0000-0001-BAE3-D.

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Wang, Chun-Sheng, and 王春生. "Lattice Boltzmann Modeling and Simulation of Rotating Turbulent Thermal Flow." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ne6zbt.

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博士<br>國立清華大學<br>動力機械工程學系<br>107<br>Due to its advantages in parallel efficiency and wall treatment, the lattice Boltzmann method (LBM) has emerged as a powerful alternative to traditional Navier-Stokes solvers for modeling and simulating turbulent thermal flows in recent two decades. Although increasing attention has been paid to stationary lattice Boltzmann models, the development of rotational ones is still at its very early stage. In this study, LBM in a rotating frame of reference is firstly proposed for large eddy simulation of turbulent flows and heat transfer with system rotation. The s

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Ton, Fu Kung, and 譚富光. "Numerical Simulation of Flow in Rotation Disk." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/91584204927451688271.

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Jane, Sue-June, and 詹淑菁. "Direct Numerical Simulation of Three-Dimensional Flow between two Rotating Cylinders." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/74431784392451324239.

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Chen, Wen-Chi, and 陳文錡. "Simulating Rotating Shallow Water Flows By BGK Scheme." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/05944779363565672260.

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碩士<br>國立臺灣大學<br>數學研究所<br>95<br>The shallow water equation is an usual model to describe the flows in river, ocean, and atmosphere etc. In this paper, a finite volume gas-kinetic BGK scheme is derived to simulate rotating shallow water flows.

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Chen, Wen-Chi. "Simulating Rotating Shallow Water Flows By BGK Scheme." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1207200714540600.

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Zhang, Ye. "Large-eddy Simulation of Turbulent Flows in A Heated Streamwise Rotating Channel." 2012. http://hdl.handle.net/1993/5249.

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In this thesis, large-eddy simulation has been performed to investigate a heated plane channel flow subjected to streamwise system rotations. A variety of rotation numbers ranging from Roτ = 0 to 15 have been tested in conjunction with two fixed low Reynolds numbers Reτ = 150 and 300. The fundamental characteristics of the resolved velocity and temperature ﬁelds in terms of their mean and root-mean-square (RMS) values are investigated. Advanced physical features in terms of the transport of turbulent stresses, turbulent kinetic energy (TKE), heat fluxes and forward and backward scatter of loca

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Xun, Qianqiu. "Large-eddy simulation of spanwise rotating turbulent channel flow with heat transfer." 2010. http://hdl.handle.net/1993/21665.

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