Relevant bibliographies by topics / Reynolds Averaged Navier-Stokes (RANS) / Dissertations / Theses
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Dissertations / Theses on the topic 'Reynolds Averaged Navier-Stokes (RANS)'

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Published: 4 June 2021
Last updated: 27 July 2025

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1

Frazza, Loïc. "3D anisotropic mesh adaptation for Reynolds Averaged Navier-Stokes simulations." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS423.

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Nous montrons dans cette thèse la capacité des schémas numériques modernes à simuler des écoulements turbulents sur des maillages totalement non-structurés générés automatiquement à l’aide de méthodes adaptatives. Nous détaillons le développement de différentes versions du modèle de Spalart-Allmaras ainsi que les choix numériques garantissant une robustesse suffisante du solver pour ne pas nécessiter de couche limite structurée. Nous introduisons en suite l’analyse d’erreur nécessaire pour proposer different estimateurs d’erreur à la base de l’optimisation de maillage. Cette méthodologie est t
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2

Shin, Sangmook. "Reynolds-Averaged Navier-Stokes Computation of Tip Clearance Flow in a Compressor Cascade Using an Unstructured Grid." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28947.

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A three-dimensional unstructured incompressible RANS code has been developed using artificial compressibility and Spalart-Allmaras eddy viscosity model. A node-based finite volume method is used in which all flow variables are defined at the vertices of tetrahedrons in an unstructured grid. The inviscid fluxes are computed by using the Roe's flux difference splitting method, and higher order accuracy is attained by data reconstruction based on Taylor series expansion. Gauss theorem is used to formulate necessary gradients. For time integration, an implicit scheme based on linearized Euler back
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3

Li, Zhiyong. "Data-Driven Adaptive Reynolds-Averaged Navier-Stokes k - ω Models for Turbulent Flow-Field Simulations". UKnowledge, 2017. http://uknowledge.uky.edu/me_etds/93.

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The data-driven adaptive algorithms are explored as a means of increasing the accuracy of Reynolds-averaged turbulence models. This dissertation presents two new data-driven adaptive computational models for simulating turbulent flow, where partial-but-incomplete measurement data is available. These models automatically adjust (i.e., adapts) the closure coefficients of the Reynolds-averaged Navier-Stokes (RANS) k-ω turbulence equations to improve agreement between the simulated flow and a set of prescribed measurement data. The first approach is the data-driven adaptive RANS k-ω (D-DARK) model
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4

Somero, John Ryan. "Computational Simulations of a Non-body of Revolution Ellipsoidal Model Utilizing RANS." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/36135.

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The ability of Reynolds Averaged Navier Stokes (RANS) models to predict the characteristics of a non-Body of Revolution (non-BOR) Ellipsoidal model is studied to establish the feasibility of utilizing RANS as a non-BOR concept design tool. Data unable to be obtained experimentally, such as streamwise and spanwise pressure gradients and yaw turn boundary layer characteristics, are also established. A range of conditions are studied including ahead, pitched up, steady 10 and 15 degree yaw turns, and unsteady 10 and 15 degree yaw turns. Simulation results show good agreement for ahead and pitched
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5

Srinivasa, Murthy P. "Low Reynolds Number Airfoil Aerodynamics." Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/229.

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In this thesis we describe the development of Reynolds- averaged Navier Stokes code for the flow past two- dimensional configuration. Particularly, emphasis has been laid on the study of low Reynolds number airfoil aerodynamics. The thesis consists of five chapters covering the back ground history, problem formulation, method of solution and discussion of the results and conclusion. Chapter I deals with a detailed background history of low Reynolds number aerodynamics, problem associated with it, state of the art, its importance in practical applications in aircraft industries. Chapte
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6

Srinivasa, Murthy P. "Low Reynolds Number Airfoil Aerodynamics." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/229.

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In this thesis we describe the development of Reynolds- averaged Navier Stokes code for the flow past two- dimensional configuration. Particularly, emphasis has been laid on the study of low Reynolds number airfoil aerodynamics. The thesis consists of five chapters covering the back ground history, problem formulation, method of solution and discussion of the results and conclusion. Chapter I deals with a detailed background history of low Reynolds number aerodynamics, problem associated with it, state of the art, its importance in practical applications in aircraft industries. Chapter II d
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7

Henning, H. L. "A numerical investigation into the heave, sway and roll motions of typical ship like hull sections using RANS numerical methods." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18033.

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Thesis (MScEng)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: The hydrodynamic characteristics of three typical ship-like hull sections, in different motions, are numerically investigated using FLUENT, 2009. These simple shapes, namely a v-bottom (triangle) hull, a at-bottom (square) hull and a round-bottom (semi-circle) hull, are investigated in uncoupled heave, sway and roll. The problem is described in two dimensions. A combination of numerical methods and models, found in literature, are used to conduct this investigation. Hull characterisation is achieved through the use of
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8

Divaret, Lise. "U-RANS Simulation of fluid forces exerted upon an oscillating tube array." Thesis, KTH, Farkost och flyg, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32747.

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The aim of this master thesis is to characterize the fluid forces applied to a fuel assembly inthe core of a nuclear power plant in case of seism. The forces are studied with a simplifiedtwo-dimensional model constituted of an array of 3 by 3 infinite cylinders oscillating in aclosed box. The axial flow of water, which convects the heat in the core of a nuclear powerplant, is also taken into account. The velocity of the axial flow reaches 4m/s in the middle ofthe assembly and modifies the forces features when the cylinders move laterally.The seism is modeled as a lateral displacement with high
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9

Thiam, Mor Tallla. "Développement et validation expérimentale d'une approche numérique pour la simulation de l'aérodynamique et de la thermique d'un véhicule à trois roues." Thèse, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/9724.

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La compréhension de l'aérothermique d'un véhicule durant sa phase de développement est une question essentielle afin d'assurer, d'une part, un bon refroidissement et une bonne efficacité de ses composants et d'autre part de réduire la force de traînée et évidement le rejet des gaz à effet de serre ou la consommation d'essence. Cette thèse porte sur la simulation numérique et la validation expérimentale de l'aérothermique d'un véhicule à trois roues dont deux, en avant et une roue motrice en arrière. La simulation numérique est basée sur la résolution des équations de conservation de la masse,
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10

Norman, Adam Edward. "A Fundamental Study of Advance Ratio, Solidity, Turbine Radius, and Blade Profile on the Performance Characteristics of Vertical Axis Turbines (VATs)." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81836.

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In this dissertation, various VAT parameters are investigated to determine the effect of the overall efficiency of the turbine at a high Reynolds number. To increase the efficiency of the vertical axis turbines, 2D CFD simulations are completed in an effort to better understand the physics behind the operation of these turbines. Specifically, the effect of advance ratio, solidity, and wake interactions were investigated. Simulations were completed in OpenFOAM using the k-ω SST turbulence model at a nominal Reynolds number of 500,000 using a NACA 0015 airfoil. To simulate the motion of the turb
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11

Khan, Muhammad. "RANS and LES of multi-hole sprays for the mixture formation in piston engines." Phd thesis, Ecole Centrale de Lyon, 2014. http://tel.archives-ouvertes.fr/tel-01002111.

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Cette thèse porte sur la simulation des jets de gouttes générés par des pulvérisateurs essence haute pression, pulvérisateurs qui sont un point clef des systèmes de combustion automobile de la présente et future génération devant diminuer les émissions de CO2 et de polluants. Dans un premier temps les jets de gouttes (" sprays ") sont simulés par simulation moyennée. Les résultats de simulation d'un jet donnant des résultats en moyenne satisfaisant, l'interaction de jets en injecteurs multi-trous est alors simulée. Les résultats sont cohérents par rapport aux mesures d'entraînement d'air. La s
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12

Süer, Assiye. "LES Simulation of Hot-wire Anemometers." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62264.

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Hot wire anemometers have been used in several wind velocity sensors deployed in Mars. They are based in keeping the temperature of a surface at a constant value, above the ambient. This is done by means of a heater controlled with an electronic system. The cooling rate of each point at the sensor surface can be used to calculate the wind velocity and direction. However, due to turbulent fluctuations, the cooling rate is not constant even in the case of constant velocity. Moreover, RANS simulations cannot estimate such fluctuations as they only provide an estimation of the averaged flow field.
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13

Pittard, Matthew Thurlow. "Large Eddy Simulation Based Turbulent Flow-induced Vibration of Fully Developed Pipe Flow." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd295.pdf.

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14

Trigell, Emelie. "CFD-simulations of urea-waterspray in an after-treatment systemusing Star-CCM+." Thesis, KTH, Mekanik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-250015.

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The legislation has forced the vehicle industry to reduce tail-end emissions. The air pollutant nitrogen oxide (NOX) has been shown to have a negative impact on human health and the environment. One of the key technologies to reduce the levels of NOX emitted from a vehicle is by implementing an after-treatment system. The after-treatment system includes catalysts, a particle filter and an evaporation system. In the evaporation system a liquid jet containing a urea-water solution known as AdBlue is injected into the hot exhaust gases to evaporate into gaseous ammonia NH3 and water H2O. Then NH3
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15

Belmar, Gil Mario. "Computational study on the non-reacting flow in Lean Direct Injection gas turbine combustors through Eulerian-Lagrangian Large-Eddy Simulations." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/159882.

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[ES] El principal desafío en los motores turbina de gas empleados en aviación reside en aumentar la eficiencia del ciclo termodinámico manteniendo las emisiones contaminantes por debajo de las rigurosas restricciones. Ésto ha conllevado la necesidad de diseñar nuevas estrategias de inyección/combustión que operan en puntos de operación peligrosos por su cercanía al límite inferior de apagado de llama. En este contexto, el concepto Lean Direct Injection (LDI) ha emergido como una tecnología prometedora a la hora de reducir los óxidos de nitrógeno (NOx) emitidos por las plantas propulsoras de lo
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16

Monier, Jean-François. "Analyse de la modélisation turbulente en écoulements tourbillonnaires." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC015/document.

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L'objectif de la présente étude est d'analyser la modélisation de la turbulence de simulations en moyenne de Reynolds (RANS) dans le cadre d'écoulements de type turbomachines, en utilisant des simulations aux grandes échelles (SGE) comme référence. L'étude porte sur deux cas test: un décollement de coin dans une grille d'aubes rectiligne, et un écoulement de jeu pour un aubage isolé dans un jet. Deux lois de comportement, la loi de comportement de Boussinesq et la loi de comportement quadratique (quadratic constitutive relation ou QCR), sont analysées, avec deux versions du modèle de turbulenc
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17

Kokkonen, Toni. "CFD analysis of stepped planing vessels." Thesis, KTH, Mekanik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-250023.

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High speed planing hulls are currently widely used for example in recreational and emergency vessel applications. However, very little CFD research has been done for planing vessels, especially for those with stepped hulls. A validated CFD method for planing stepped hulls could be a valuable improvement for the design phase of such hulls. In this thesis, a CFD method for stepped hulls, with a primary focus on two-step hulls, is developed using STAR-CCM+. As a secondary objective, porpoising instability of two-step hulls is investigated. The simulations are divided into two parts: In the first
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18

Landmann, Björn. "A parallel discontinuous Galerkin code for the Navier-Stokes and Reynolds-averaged Navier-Stokes equations." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-35199.

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19

Landmann, Björn. "A parallel discontinuous Galerkin code for the Navier-Stokes and Reynolds averaged Navier-Stokes equations." München Verl. Dr. Hut, 2007. http://d-nb.info/988422433/04.

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20

Skála, Adam. "Analýza inerčního odlučovače částic na vstupu vzduchu do turbovrtulového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400827.

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This thesis focuses on ingestion of foreign objects into standard turboprop engine GE H80 situated in aircraft Let L-410 Turbolet. Aim of this study is to create methodology of numerical simulation of particle movement inside the engine, which could be used during design process of Inertial Particle Separator device. Thesis consists of backward-facing step benchmark study which validates used methodology. Second part describes flow field calculation and numerical setup. The last part is dedicated to particle tracking analysis. Simulated trajectories are visually investigated, and coordinates o
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21

Kaya, Serpil. "Reynolds-averaged Navier-stokes Computations Of Jet Flows Emanating From Turbofan Exhausts." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12610078/index.pdf.

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This thesis presents the results of steady, Reynolds-averaged Navier-Stokes (RANS) computations for jet flow emanating from a generic turbofan engine exhaust. All computations were performed with commercial solver FLUENT v6.2.16. Different turbulence models were evaluated. In addition to turbulence modeling issues, a parametric study was considered. Different modeling approaches for turbulent jet flows were explained in brief, with specific attention given to the Reynolds-averaged Navier-Stokes (RANS) method used for the calculations. First, a 2D ejector problem was solved to find out the mos
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22

Moro-Ludeña, David. "An adaptive high order Reynolds-averaged Navier-Stokes solver with transition prediction." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/97355.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 219-239).<br>The use of simulation techniques in applied aerodynamics has increased dramatically in the last three decades fostered by the growth in computational power. However, the state of the art discretization in industrial solvers remains nominally second order accurate, which makes them unfeasible to resolve multi-scale phenomena such as turbulence or acoustics, and limits their efficiency in terms
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23

Modisette, James M. "An automated reliable method for two-dimensional Reynolds-Averaged Navier-Stokes simulations." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68406.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 171-180).<br>The development of computational fluid dynamics algorithms and increased computational resources have led to the ability to perform complex aerodynamic simulations. Obstacles remain which prevent autonomous and reliable simulations at accuracy levels required for engineering. To consider the solution strategy autonomous and reliable, high quality solutions must be provided without user interaction o
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24

Miller, Steven Arthur Eric Morris Philip J. "The prediction of broadband shock-associated noise using Reynolds-averaged Navier-Stokes solutions." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4340/index.html.

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25

Edeling, Wouter Nico. "Quantification of modelling uncertainties in turbulent flow simulations." Thesis, Paris, ENSAM, 2015. http://www.theses.fr/2015ENAM0007/document.

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Le but de cette thèse est de faire des simulations prédictives à partir de modèles de turbulence de type RANS (Reynolds-Averaged Navier-Stokes). Ces simulations font l'objet d'un traitement systématique du modèle, de son incertitude et de leur propagation par le biais d'un modèle de calcul prédictif aux incertitudes quantifiées. Pour faire cela, nous utilisons le cadre robuste de la statistique Bayesienne.La première étape vers ce but a été d'obtenir une estimation de l'erreur de simulations RANS basées sur le modèle de turbulence de Launder-Sharma k-e. Nous avons recherché en particulier à es
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26

Viltapuram, Naresh Goud. "Reynolds-averaged Navier-Stokes simulations over a protrusion using a Spalart-Allmaras turbulence model." Thesis, Wichita State University, 2012. http://hdl.handle.net/10057/5613.

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This research performed Reynolds-averaged Navier-Stokes (RANS) simulations for the flow past an aircraft protrusion mounted on a flat surface. The major factor in this research is the investigation of shock-wave/boundary-layer interactions (SWBLIs). RANS computations were performed using the Spalart-Allmaras turbulence model and a second-order Navier-Stokes solver. The two complex three-dimensional geometries primarily focused on in this research were the circular-arc bump antenna and the TT-5006A antenna. Numerical results were in good agreement with the wind tunnel experimental results; howe
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27

Boles, John Arthur. "Hybrid Large-Eddy Simulation/Reynolds-Averaged Navier-Stokes Methods and Predictions for Various High-Speed Flows." NCSU, 2009. http://www.lib.ncsu.edu/theses/available/etd-08122009-170842/.

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Hybrid Large Eddy Simulation/Reynolds-Averaged Navier-Stokes (LES/RANS) simulations of several high-speed flows are presented in this work. The solver blends a Menter BSL two-equation model for the RANS part of the closure with a Smagorisnky sub-grid model for the LES component. The solver uses a flow-dependent blending function based on wall distance and a modeled form of the Taylor micro-scale to transition from RANS to LES. Turbulent fluctuations are initiated and are sustained in the inflow region using a recycling/rescaling technique. A new multi-wall recycling/rescaling technique is desc
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28

Oliver, Todd A. 1980. "A high-order, adaptive, discontinuous Galerkin finite element method for the Reynolds-Averaged Navier-Stokes equations." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/46818.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2008.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 175-182).<br>This thesis presents high-order, discontinuous Galerkin (DG) discretizations of the Reynolds-Averaged Navier-Stokes (RANS) equations and an output-based error estimation and mesh adaptation algorithm for these discretizations. In particular, DG discretizations of the RANS equations with the S
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29

Oliver, Todd A. "A High-Order, Adaptive, Discontinuous Galerkin Finite Element Method for the Reynolds-Averaged Navier-Stokes Equations." Ft. Belvoir : Defense Technical Information Center, 2008. http://handle.dtic.mil/100.2/ADA488912.

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30

Yorke, Christopher Philip. "Direct numerical simulation of a strained and recovered channel flow with Reynolds-averaged Navier-Stokes model comparisons." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/47118/.

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31

Lakshmipathy, Sunil. "PANS method of turbulence: simulation of high and low Reynolds number flows past a circular cylinder." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3338.

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The objective of the study is to investigate the capability of PANS (Partially Averaged Navier-Stokes Simulation) model over a wide range of Reynolds numbers and flow physics. In this regard, numerical simulations of turbulent flow past a circular cylinder are performed at ReD 140,000 and ReD 3900 using the PANS model. The high Reynolds number PANS results are compared with experimental results from Cantwell and Coles, Large Eddy Simulation results from Breuer, and Detached Eddy Simulation results from Travin et al. Low Reynolds number PANS results are compared with experimental results from O
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Acosta, Jared. "Comparative Hydrodynamic Testing of Small Scale Models." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/864.

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Early in the ship design process, naval architects must often evaluate and compare multiple hull forms for a specific set of requirements. Analytical tools are useful for quick comparisons, but they usually specialize in a specific hull type and are therefore not adequate for comparing dissimilar hull types. Scale model hydrodynamic testing is the traditional evaluation method, and is applicable to most hull forms. Scale model tests are usually performed on the largest model possible in order to achieve the most accurate performance predictions. However, such testing is very resource i
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Bond, Ryan Bomar. "Reynolds-Averaged Navier-Stokes Analysis of the Flow through a Model Rocket-Based Combined Cycle Engine with an Independently-Fueled Ramjet Stream." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-08132003-171258/.

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A new concept for the low speed propulsion mode in rocket based combined cycle (RBCC) engines has been developed as part of the NASA GTX program. This concept, called the independent ramjet stream (IRS) cycle, is a variation of the traditional ejector ramjet (ER) design and involves the injection of hydrogen fuel directly into the air stream, where it is ignited by the rocket plume. Experiments and computational fluid dynamics (CFD) are currently being used to evaluate the feasibility of the new design. In this work, a Navier-Stokes code valid for general reactive flows is applied to the model
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34

Elzaabalawy, Hashim ibrahim mohamed. "Towards High-Order Compact Discretization of Unsteady Navier-Stokes Equations for Incompressible Flows on Unstructured Grids." Thesis, Ecole centrale de Nantes, 2020. https://tel.archives-ouvertes.fr/tel-03274249.

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Une méthode haut ordre de résolution des équations de Navier-Stokes pour un écoulement incompressible basée sur une discrétisation éléments finis Galerkin discontinu hybride est présentée pour laquelle la stabilité énergétique est assurée et la masse et la quantité de mouvement sont conservées. La formulation calcule exactement des champs de vitesse solénoïdaux pour des types d'élément standard sans avoir recours à des opérateurs de post-traitement ou à des espaces fonctionnels \textit{H}(div) conformes. Ceci est réalisé en proposant une définition simple et nouvelle de l'espace fonctionnel po
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Fjällman, Johan. "Large Eddy Simulations of Complex Flows in IC-Engine's Exhaust Manifold and Turbine." Doctoral thesis, KTH, Strömningsfysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-151399.

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The thesis deals with the flow in pipe bends and radial turbines geometries that are commonly found in an Internal Combustion Engine (ICE). The development phase of internal combustion engines relies more and more on simulations as an important complement to experiments. This is partly because of the reduction in development cost and the shortening of the development time. This is one of the reasons for the need of more accurate and predictive simulations. By using more complex computational methods the accuracy and predictive capabilities are increased. The disadvantage of using more sophisti
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Panguluri, Sri S. "IMPLEMENTATION AND VALIDATION OF THE HYBRID TURBULENCE MODELS IN AN UNSTRUCTURED GRID CODE." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/435.

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Since its introduction in 1997, the use of Detached Eddy Simulation (DES) and similar hybrid turbulence techniques has become increasingly popular in the field of CFD. However, with increased use some of the limitations of the DES model have become apparent. One of these is the dependence of DES on grid construction, particularly regarding the point of transition between the Reynolds-Averaged Navier-Stokes and Large Eddy Simulation models. An additional issue that arises with unstructured grids is the definition of the grid spacing in the implementation of a DES length scale. To lay the ground
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Kim, Dongjin. "Large eddy simulation of flow in water and wastewater disinfection reactors." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41089.

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Hydrodynamic behavior in reactors used for water treatment, particularly in ozone contactors with serpentine flow, is known to strongly affect the process efficiency. However, exact flow characteristics inside these reactors are not well understood, as traditional approach either considers these reactors as black box or relies on less accurate Reynolds-Averaged Navier-Stokes (RANS) simulation. In order to provide a deep understanding of the hydrodynamics and solute transport phenomena in these reactors, high resolution numerical studies using the Large Eddy Simulation (LES) method are performe
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Guenot, Damien. "Simulation des effets instationnaires à grande échelle dans les écoulements décollés." École nationale supérieure de l'aéronautique et de l'espace (Toulouse ; 1972-2007), 2004. http://www.theses.fr/2004ESAE0009.

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Le calcul des écoulements turbulents décollés est un des enjeux majeurs de l’aérodynamique numérique. Différentes méthodes existent : résolution des équations moyennées stationnaires, instationnaires (RANS/URANS), ou Simulation des Grandes Échelles (SGE). La méthode hybride Detached Eddy Simulation (DES) semble bien adaptée : elle utilise un modèle unique qui se comporte près des parois comme un modèle URANS (limite le coût de calcul), et loin comme une SGE (décrit mieux les écoulements hors équilibre). Les calculs de plaque plane montrent la nécessité de calculer les zones attachées en mode U
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Mcnaughton, James. "Turbulence modelling in the near-field of an axial flow tidal turbine in Code_Saturne." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/turbulence-modelling-in-the-nearfield-of-an-axial-flow-tidal-turbine-in-codesaturne(54c9b513-2472-4c61-a521-8ef73428465b).html.

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This Thesis presents simulation of flow past laboratory-scale and full-scale tidal stream turbines (TST) using EDF's open-source CFD solver Code_Saturne. The work shows that detailed results may be obtained with confidence and that greater information on the loading and wake structure is available than other methods, such as blade element momentum theory.Results are obtained using a new sliding-mesh method that has been implemented in Code_Saturne as part of this work. The sliding-mesh method uses internal Dirichlet boundary conditions with values on the interface prescribed via a halo-point m
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40

Kaya, Mustafa. "Computation Of Viscous Flows Over Flapping Airfoils And Parallel Optimization Of Flapping Parameters." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/12612286/index.pdf.

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Airfoils &deg<br>apping in pitch and plunge are studied, and the &deg<br>apping motion parameters are op- timized to maximize thrust generation and the e&plusmn<br>ciency of the thrust generation. Unsteady viscous &deg<br>ow&macr<br>elds over &deg<br>apping airfoils are computed on overset grids using a Navier-Stokes solver. Computations are performed in parallel using Parallel Virtual Machine library routines in a computer cluster. A single &deg<br>apping airfoil and dual airfoils &deg<br>apping in a biplane con- &macr<br>guration are considered. A gradient based optimization algorithm is emp
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Gao, Feng. "Advanced numerical simulation of corner separation in a linear compressor cascade." Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0008/document.

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La demande croissante pour alléger les moteurs d’avions et diminuer les émissions polluantes de la propulsion aéronautique réclame à rendre plus compact le système de compression des moteurs, qui représente environ 40%-50% de la masse totale. Or, à taux de compression global égal, la réduction du nombre d’étage exige d’un point de vue aérodynamique une augmentation de la charge des aubes de compresseur par étage. La charge d’aube est aujourd’hui limitée car elle induit différents mécanismes de pertes tridimensionnelles très pénalisant. L’un des plus importants est le décollement de coin qui se
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42

Khosrow, Ebrahimi. "Numerical simulation of turbulent airflow, tracer gas diffusion, and particle dispersion in a mockup aircraft cabin." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/13609.

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Doctor of Philosophy<br>Department of Mechanical and Nuclear Engineering<br>M.H. Hosni<br>Z.C. Zheng<br>In order to study the capability of computational methods in investigating the mechanisms associated with disease and contaminants transmission in aircraft cabins, the Computational Fluid Dynamics (CFD) models are used for the simulation of turbulent airflow, tracer gas diffusion, and particle dispersion in a generic aircraft cabin mockup. The CFD models are validated through comparisons of the CFD predictions with the corresponding experimental measurements. It is found that using Large Ed
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Guillou, Florian. "CFD Study of the Flow around a High-Speed Train." Thesis, KTH, Aerodynamik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102033.

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This document is a report summering the master thesis work dealing with the Computational Fluid Dynamic (CFD) study of the flow around a high-speed train. The model is a scaled 1:50 generic train with two cars, one inter-car gap and simplified bogies. A platform is set on the side of the train since one of the aim of the study is to look at the consequences of the phenomena in the wake on people or objects standing on the platform. The slipstream is one of this phenomena, it is due to the fact that the viscous air is dragged when the train is passing. If too strong, it can move or destabilize
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44

William, James Pringle. "Two-way Coupled Multiscale Tsunami Modelling from Generation to Coastal Zone Hydrodynamics." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215503.

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Li, Bo. "Aerodynamic and acoustic analysis of the tip-leakage flow past a single ailfoil." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC042/document.

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L'écoulement de jeu est un phénomène très important dans les turbomachines. Il provient du mouvement relatif entre la pale et la paroi d'extrémité, et la différence de pression à travers la pale. L'écoulement de jeu est extrêmement complexe pour sa nature tridimensionnelle et instable, et son existence conduit à de nombreux effets défavorables, par exemple, les pertes de performance aérodynamique et les émissions de bruit. C'est pourquoi l'écoulement de jeu a motivé de nombreuses recherches expérimentales et numériques. Afin d'améliorer la compréhension du écoulement de jeu et le bruit de larg
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46

Quattromini, Michele. "Graph Neural Networks for fluid mechanics : data-assimilation and optimization." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST161.

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Cette thèse de doctorat explore l'application des réseaux de neurones en graphes (GNN) dans le domaine de la dynamique des fluides numérique (CFD), avec un accent particulier sur l'assimilation de données et l'optimisation. Le travail est structuré en trois parties principales: assimilation de données pour les équations de Navier-Stokes moyennées à la Reynolds (RANS) basée sur des modèles GNN; assimilation de données augmentée par les GNN avec des contraintes physiques imposées par la méthode adjointe; optimisation des systèmes fluides par des techniques d'apprentissage automatique (ML).Dans l
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Kashyap, Shalini. "A 3-D Numerical Study of Flow, Coherent Structures and Mechanisms Leading to Scour in a High Curvature 135° Channel Bend with and Without Submerged Groynes." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23323.

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This thesis focused on investigating flow, coherent structures, and mechanisms leading to scour around a series of three submerged groynes in a high curvature (radius of curvature (R)/channel width (B)=1.5) channel bend using a Large Eddy Simulation Numerical (LES) model. Flow was investigated during both an initial and a later stage of scour. The results showed that the groynes appeared effective in keeping the main core of high streamwise velocity away from the outer bank wall in the region where they were installed, although high potential still existed for local scour around the groynes.
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Joulain, Antoine. "Simulation aérodynamique d'extrémités de pales de rotors sustentateurs d'hélicoptère." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4768.

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L’aérodynamique de l’hélicoptère est fortement impactée par les tourbillons générés aux extrémités de pales. La complexité des phénomènes en jeux et l’insuffisance de données expérimentales locales font du design d’extrémité un véritable défi. Cette étude propose une nouvelle approche dédiée à l’étude des extrémités en vol stationnaire. Une méthode numérique rapide et précise est mise au point afin d’étudier une extrémité de pale en rotation comme une extrémité d’aile fixe. Chaque étape de la construction de la méthode est validée par des comparaisons détaillées avec des données expérimentales
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Auza, Gutierrez Rodrigo. "Prediction of Aerodynamically Induced Hood Vibration of Trailing Vehicles." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546472529004518.

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Robertson, Francis. "An experimental investigation of the drag on idealised rigid, emergent vegetation and other obstacles in turbulent free-surface flows." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/an-experimental-investigation-of-the-drag-on-idealised-rigid-emergent-vegetation-and-other-obstacles-in-turbulent-freesurface-flows(07165357-67da-461d-a6a2-ed4970e2cb0c).html.

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Vegetation is commonly modelled as emergent arrays of rigid, circular cylinders. However, the drag coefficient (CD) of real stems or trunks is closer to that of cylinders with a square cross-section. In this thesis, vegetation has been idealised as square cylinders in laboratory experiments with a turbulence intensity of the order of 10% which is similar to that of typical river flows. These cylinders may also represent other obstacles such as architectural structures. This research has determined CD of an isolated cylinder and cylinder pairs as a function of position as well as the average dr
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