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Dissertations / Theses on the topic 'Large eddy simulation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hällqvist, Thomas. "Large Eddy Simulation of Impinging Jets." Doctoral thesis, KTH, Mekanik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3858.

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This thesis deals with Large Eddy Simulation (LES) of impinging air jets. The impinging jet configuration features heated circular jets impinging onto a flat plate. The problem addressed here is of generic nature, with applications in many engineering devices, such as cooling of components in gas turbines, in cars and electronic devices. The flow is inherently unsteady and contains relatively slowly varying coherent structures. Therefore, LES is the method of choice when the Reynolds number is large enough to exclude Direct Numerical Simulations (DNS). The present LES model is a basic model wi

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2

Cavallo, Marincola Fabrizio. "Large eddy simulation of coal combustion." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/34316.

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In this work an in-house code for large-eddy simulations of coal combustion is developed and tested, with a special focus on the issue of modelling radiative heat transfer effects inside a furnace. An Eulerian-Lagrangian approach is used to describe the continuous gas phase and the discrete particle phase, with a two-way coupling between the two phases (implemented by another group member). The radiative transfer equation is solved using the discrete ordinates method, testing several different angular and spatial discretisation schemes. The spectral properties of the participating media are ap

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3

Worthy, Jude. "Large eddy simulation of buoyant plumes." Thesis, Cranfield University, 2003. http://hdl.handle.net/1826/92.

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A 3d parallel CFD code is written to investigate the characteristics of and differences between Large Eddy Simulation (LES) models in the context of simulating a thermal buoyant plume. An efficient multigrid scheme is incorporated to solve the Poisson equation, resulting from the fractional step, projection method used to solve the Low Mach Number (LMN) Navier-Stokes equations. A wide range of LES models are implemented, including a variety of eddy models, structure models, mixed models and dynamic models, for both the momentum stresses and the temperature fluxes. Generalised gradient flux mo

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4

Ouro, Barba Pablo. "Large eddy simulation of tidal turbines." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/103301/.

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Understanding of hydrodynamics involved in the flow around tidal turbines is essential to enhance their performance and resilience, as they are designed to operate in harsh marine environments. During their lifespan, they are subjected to high velocities with large levels of turbulence that demand their design to be greatly optimised. Experimental tests have provided valuable information about the performance of tidal stream devices but these are often conducted in constricted flumes featuring turbulent flow conditions different to those found at deployment sites. Additionally, measuring veloc

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5

Xie, Xuping. "Large Eddy Simulation Reduced Order Models." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/77626.

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This dissertation uses spatial filtering to develop a large eddy simulation reduced order model (LES-ROM) framework for fluid flows. Proper orthogonal decomposition is utilized to extract the dominant spatial structures of the system. Within the general LES-ROM framework, two approaches are proposed to address the celebrated ROM closure problem. No phenomenological arguments (e.g., of eddy viscosity type) are used to develop these new ROM closure models. The first novel model is the approximate deconvolution ROM (AD-ROM), which uses methods from image processing and inverse problems to s

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6

Keays, John F. "Large eddy simulation of premixed combustion." Thesis, Imperial College London, 2007. http://hdl.handle.net/10044/1/11284.

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7

Shi, Shaoping. "Large-eddy simulation of ship wakes." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2217.

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Thesis (Ph. D.)--West Virginia University, 2001.<br>Title from document title page. Document formatted into pages; contains xv, 211 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 200-211).

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8

Gobert, Christian. "Large Eddy Simulation of particle-laden flow." kostenfrei, 2010. https://mediatum2.ub.tum.de/node?id=829484.

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9

Hawkes, Evatt Robert. "Large eddy simulation of premixed turbulent combustion." Thesis, University of Cambridge, 2001. https://www.repository.cam.ac.uk/handle/1810/251761.

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10

Ma, Tingguang. "Large-eddy simulation of variable density flows." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/4185.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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11

García-Villalba, Navaridas Manuel. "Large eddy simulation of turbulent swirling jets." Karlsruhe : Univ.-Verl. Karlsruhe, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?idn=979664586.

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12

O'Mahoney, T. S. D. "Large-eddy simulation of turbine rim seals." Thesis, University of Surrey, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553681.

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This thesis describes the application of Large-Eddy Simulation (LES) to the internal flows within turbomachines. In particular, the work sought to investigate whether LES could give an improved predictive tool for flows through a turbine rim seal where other methods of modelling turbulence give disappointing results for the simulation of hot annulus gas ingestion into the rim seal cavity. The applicability of LES to flow regimes within a rotor-stator cavity were investigated with reference to two experimental studies, those of Daily & Nece [1] and of Itoh et al. [2]. LES simulations were run u

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13

Ferraris, Sergio Adrian. "Large eddy simulation of under-ventilated fires." Thesis, Kingston University, 2007. http://eprints.kingston.ac.uk/20325/.

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The present thesis constitutes an important contribution to the understanding of a partially premixed combustion system associated with the hazardous backdraft phenomena. Backdraft may occur when fresh air is suddenly introduced into a vitiated environment where fire has already died out due to lack of oxygen but there are still unbumt fuel and products of incomplete combustion left. In the context of backdraft or deflagration, a complex flame structure is expected. Both, non-premixed and diffusion combustion might, in principle, be present. The present study focuses on the development of sub-

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14

König, Marcel. "Large-Eddy Simulation Modelling for Urban Scale." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-142714.

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In this work the model ASAM is enriched with new eddy viscosity based dynamic Smagorinsky subgrid-scale models. Therefore the model is more physically based to study atmospheric flow configurations at several atmospheric scales with main focus to urban scale flow with building-resolved resolution. The implemented dynamic procedures work well and showed good agreement to literature data. In a convective atmospheric boundary layer (ABL) the dynamic Smagorinsky coefficient reaches maximum values of 0.15 and decreases towards the surface or in stable stratified flow regimes. Vertical profiles of t

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15

Semlitsch, Bernhard. "Large Eddy Simulation of Turbulent Compressible Jets." Doctoral thesis, KTH, Mekanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156230.

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Acoustic noise pollution is an environmental aggressor in everyday life. Aero- dynamically generated noise annoys and was linked with health issues. It may be caused by high-speed turbulent free flows (e.g. aircraft jet exhausts), by airflow interacting with solid surfaces (e.g. fan noise, wind turbine noise), or it may arise within a confined flow environment (e.g. air ventilation systems, refrigeration systems). Hence, reducing the acoustic noise levels would result in a better life quality, where a systematic approach to decrease the acoustic noise radiation is required to guarantee optimal

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16

Wein, Lars [Verfasser]. "Large-Eddy-Simulation von Deckbandlabyrinthdichtungen / Lars Wein." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/1222160447/34.

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17

Ranga-Dinesh, K. K. J. "Large eddy simulation of turbulent swirling flames." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/21086.

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Large eddy simulation (LES) is attractive as it provides a reasonable compromise between accuracy and cost, and is rapidly evolving as a practical approach for many engineering applications. This thesis is concerned with the application of large eddy simulation to unconfined swirl in turbulent non-premixed flames and isothermal flows. The LES methodology has been applied for the prediction of turbulent swirling reacting and non-reacting flows based on laboratory scale swirl burner known as the Sydney swirl burner, which has been a target flame of the workshop series of turbulent non-premixed f

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18

König, Marcel. "Large-Eddy Simulation Modelling for Urban Scale." Doctoral thesis, Leibniz-Institut für Troposphärenforschung, 2013. https://ul.qucosa.de/id/qucosa%3A12447.

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In this work the model ASAM is enriched with new eddy viscosity based dynamic Smagorinsky subgrid-scale models. Therefore the model is more physically based to study atmospheric flow configurations at several atmospheric scales with main focus to urban scale flow with building-resolved resolution. The implemented dynamic procedures work well and showed good agreement to literature data. In a convective atmospheric boundary layer (ABL) the dynamic Smagorinsky coefficient reaches maximum values of 0.15 and decreases towards the surface or in stable stratified flow regimes. Vertical profiles of t

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19

Sheen, Shaw-Ching. "Large eddy simulation of subsonic mixing layers." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40183.

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20

Ghelfi, Matteo. "Large Eddy Simulation in internal combustion Engine." Phd thesis, Matteo Ghelfi, 2013. https://tuprints.ulb.tu-darmstadt.de/3600/7/Diss_Matteo.pdf.

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Abstract Large Eddy Simulation in internal combustion Engine Dipl.-Ing Matteo Ghel� The internal combustion (IC) engine simulation is nowadays one of the most difficult proceeding during engine development. Simultaneously this is one of the most important phase because it leads to better acknowledgment of in-cylinder phenomena and suggests new method of emission reduction and control.\\ Large Eddy Simulation (LES) can help this process because of its instationary nature, in perfect agreement with motion, injection and combustion, typical instationary components in this kind of study.\\ Th

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21

Mompó, Laborda Juan Manuel. "Engineering Large Eddy Simulation of Diesel Sprays." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/37345.

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The main objective of this PhD thesis is the study of Diesel sprays under evaporative conditions by means of Large Eddy Simulations (LES) techniques. This study has been performed implementing a precise, low-demanding LES model in the free, full-purpose Computational Fluid Dynamics (CFD) code OpenFOAM. The starting point was a careful and exhaustive review of the physical processes involved in sprays. An emphasis in CFD methodology, particularly for LES methods, was essential for the thesis, as we were able to find the possible problems and limitations of our approximation. Moreover, a

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22

Hickel, Stefan. "Implicit turbulence modeling for large-eddy simulation." kostenfrei, 2008. http://mediatum2.ub.tum.de/doc/654921/654921.pdf.

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23

Renze, Peter Clemens-August. "Large eddy simulation of film cooling flows /." Aachen : Shaker, 2008. http://d-nb.info/989959031/04.

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24

Hinterberger, Christof. "Dreidimensionale und tiefengemittelte Large-Eddy-Simulation von Flachwasserströmungen." Karlsruhe : Univ.-Verl, 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973338083.

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25

Fukagata, Koji. "Large eddy simulation of particulate turbulent channel flows." Doctoral thesis, KTH, Mechanics, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2911.

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26

El-Asrag, Hossam Abd El-Raouf. "Large Eddy Simulation Subgrid Model for Soot Prediction." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14652.

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Soot prediction in realistic systems is one of the most challenging problems in theoretical and applied combustion. Soot formation as a chemical process is very complicated and not fully understood up to the moment. The major difficulty stems from the chemical complexity of the soot formation processes as well as its strong coupling with the other thermochemical and fluid processes that occur simultaneously. Soot is a major byproduct of incomplete combustion, having a strong impact on the environment, as well as the combustion efficiency. Therefore, it needs to be predicted in realistic config

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27

Pringuey, Thibault Roland Christophe Maurice. "Large eddy simulation of primary liquid-sheet breakup." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/244655.

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This research project aims at providing the aeronautical industry with a modelling capability to simulate the fuel injection in gas turbine combustion chambers. The path to this objective started with the review of state-of-the-art numerical techniques to model the primary breakup of liquid fuel into droplets. Based on this and keeping in mind the requirements of the industry, our modelling strategy led to the generation of a mass-conservative method for efficient atomisation modelling on unstructured meshes. This goal has been reached with the creation of high-order numerical schemes for unst

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28

Langella, Ivan. "Large eddy simulation of premixed combustion using flamelets." Thesis, University of Cambridge, 2016. https://www.repository.cam.ac.uk/handle/1810/254303.

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Large Eddy Simulation (LES) has potential to address unsteady phenomena in turbulent premixed flames and to capture turbulence scales and their influence on combustion. Thus, this approach is gaining interest in industry to analyse turbulent reacting flows. In LES, the dynamics of large-scale turbulent eddies down to a cut-off scale are solved, with models to mimic the influences of sub-grid scales. Since the flame front is thinner than the smallest scale resolved in a typical LES, the premixed combustion is a sub-grid scale (SGS) phenomenon and involves strong interplay among small-scale turb

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29

Branley, Niall Thomas. "Large eddy simulation of non-premixed turbulent flames." Thesis, Imperial College London, 2000. http://hdl.handle.net/10044/1/8584.

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30

Wille, Matthias Kurt Wilhelm. "Large eddy simulation of jets in cross flows." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/8322.

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31

Yu, Shaoxi. "Large eddy simulation of deflagration to detonation transition." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/41080.

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Deflagration to detonation transition (DDT) is a very important research project for both national defense and energy industry. It is the process where a subsonic deflagration transits into a supersonic detonation, which generates shock waves. In the past years, the simulations of DDT were limited in a small domain, usually sev- eral cubic centimeters. If we want to simulate it in a larger space without improving the numerical method, we need to use the more powerful computer. When the computing resources are limited, we must improve the numerical method to achieve the big-domain simulating. T

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32

Alkishriwi, Nouri. "Large eddy simulation of low mach number flows /." Aachen : Shaker, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016487054&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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33

Papachristou, Charikleia. "Implicit Large Eddy Simulation of Environmental Urban Flows." Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/4574.

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Many environmental flows are turbulent flows. Depending on the physical aspects of the wind and the urban topology, turbulence might result into unfavourable or even dangerous conditions for the pedestrians. Turbulence can also play a very important role in the transport of toxic pollutants from accidental or intentional releases. Thus, it is vital to understand its complex characteristics so that its features are accurately predicted when computational methods are used. Real urban environment involving separation and reattachment regions provides an excellent testcase for investigating such c

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34

Mylonas, Antonios Athanassios. "Implicit large eddy simulation of turbulent duct flows." Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/5700.

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Ducts can be found in ventilation systems, cooling ducts and blade passages of turbines, centrifugal pumps and many other engineering installations. The properties of the flow in ducts can significantly aﬀect the performance and eﬃciency of these installation areas. The majority of the flows in ducts and engineering applications are turbulent. The work presented in this thesis focuses on the analysis of turbulent flows inside square sectioned ducts and ducts with bends. The accuracy of three diﬀerent high resolution high order schemes in the context of Implicit Large Eddy Simulation (ILES) is

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35

Xiao, Feng. "Large Eddy Simulation of liquid jet primary breakup." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10148.

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Atomisation of liquid fuel jets is an important determinant of combustion performance in gas turbine engines, and thus is the prime research driver here. Since the first stage of the atomisation process primary breakup has not been well understood due to its complexity, the objective of the current project is to develop a robust algorithm for Large Eddy Simulation (LES) to predict primary breakup. In order to provide realistic turbulent inflows for LES of liquid jet primary breakup, a rescaling/recycling method has been developed and validated. Three interface capturing ethods, namely Level Se

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36

Lyra, Sgouria. "Large eddy simulation of isothermal and reacting sprays." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526391.

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37

Liu, Weiyun. "INVESTIGATION OF FILTERING METHODS FOR LARGE-EDDY SIMULATION." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/46.

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This thesis focuses on the phenomenon of aliasing and its mitigation with two explicit filters, i.e., Shuman and Padé filters. The Shuman filter is applied to velocity components of the Navier--Stokes equations. A derivation of this filter is presented as an approximation of a 1-D “pure math” mollifier and extend this to 2D and 3D. Analysis of the truncation error and wavenumber response is conducted with a range of grid spacings, Reynolds numbers and the filter parameter, β. Plots of the relationship between optimal filter parameter β and grid spacing, L2-norm error and Reynolds number to sug

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38

Xu, Baopeng. "Large eddy simulation of evaporating two-phase flows." Thesis, Kingston University, 2006. http://eprints.kingston.ac.uk/20324/.

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The objective of this study is to develop a CFD tool for performing reliable large eddy simulation (LES) of the compressible evaporating two-phase turbulent flow in a gas turbine combustor. The KIVA-3V code originally developed by Los Alamos National Laboratory is used as a baseline code. The KIVA-3V code has been modified to facilitate LES calculations. Both the temporal and spatial accuracies of the original KIVA-3V code have been improved to second order. A one-equation subgrid scale (SGS) turbulence model is implemented to describe the unresolved turbulent subgrid effect. To ensure that th

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39

Chua, Ken. "Large Eddy Simulation of flow around bridge abutments." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/116655/.

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Extreme hydrological events have increased the frequency of ooding scenarios in recent years, resulting in significant bridge inundation and associated damages. Turbulence structures within the ow field are highly energetic and possess high sediment entrainment capacity which will lead to the scour formation around the bridge foundation and consequently causes structural instability or even failure of the structure. This research employs the method of Large Eddy Simulation (LES) to elucidate the complex ow mechanisms around bridge abutments in changing conditions. The level set method (LSM) is

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40

Prasad, Vinayaka Nakul. "Large eddy simulation of partially premixed turbulent combustion." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/11871.

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41

Baba, Ahmadi Mohammad Hassan. "Construction of inlet conditions for large eddy simulation." Thesis, University of Exeter, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740749.

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42

Volavý, Jaroslav. "Řešení turbulentního dvoufázového proudění metodou Large Eddy Simulation." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-234161.

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Doctoral thesis deals with the numerical simulations of two-phase flows, especially with prediction of movement of dispersed phase (particles) carried by fluid. The Euler-Lagrange approach was applied for description of the system fluid-particles. It means that the fluid is considered to be continuum and its movement is described using Euler approach. Particles are regarded as mass points and their movement is solved using Lagrangian approach. The Large Eddy Simulation method was adopted for solution of the fluid flow. The series of simulations of the backward-facing step flow laden with parti

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43

Lettieri, Claudio. "Large eddy simulation of two-phase reacting flows." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/11285.

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44

Niall, Branley. "Large eddy simulation of non-premixed turbulent flames." Boston Spa, U.K. : British Library Document Supply Centre, 1999. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.314128.

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45

ABRUNHOSA, JOSE DINIZ MESQUITA. "TURBULENT COMPLEX FLOW SIMULATION WITH CLASSICAL MODELING AND LARGE EDDY SIMULATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=4346@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Uma investigação da capacidade de previsão de modelos de turbulência baseados na modelagem estatística clássica e de grandes escalas é apresentada. A modelagem estatística clássica de turbulência (média de Reynolds) foi analisada, através da solução de escoamentos complexos, como, por exemplo, o escoamento turbulento em degrau (backstep). Especial atenção foi dada aos modelos kapa-epsilon de baixo Reynolds e as variantes renormalizadas (RNG). O comportamento dos vários termos da equação da energia cinética turbulenta na

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46

Stone, Christopher. "Large-Eddy simulation of combustion dynamics in swirling flows." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/13430.

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47

Ziefle, Jörg. "Large-eddy simulation of complex massively-separated turbulent flows /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17846.

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48

Porumbel, Ionuţ. "Large Eddy Simulation of premixed and partially premixed combustion." Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-11042006-042840/.

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Thesis (Ph. D.)--Aerospace Engineering, Georgia Institute of Technology, 2007.<br>Yeung, Pui-Kuen, Committee Member ; Lieuwen, Tim, Committee Member ; Menon, Suresh, Committee Chair ; Seitzman, Jerry, Committee Member ; Syed, Saadat, Committee Member.

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49

Porumbel, Ionut. "Large Eddy Simulation of premixed and partially premixed combustion." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14050.

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Large Eddy Simulation (LES) of bluff body stabilized premixed and partially premixed combustion close to the flammability limit is carried out in this thesis. The LES algorithm has no ad-hoc adjustable model parameters and is able to respond automatically to variations in the inflow conditions. Algorithm validation is achieved by comparison with reactive and non-reactive experimental data. In the reactive flow, two scalar closure models, Eddy Break-Up (EBULES) and Linear Eddy Mixing (LEMLES), are used and compared. Over important regions, the flame lies in the Broken Reaction Zone regime. He

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50

Kirtaş, Mehmet. "Large Eddy Simulation of a High Aspect Ratio Combustor." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14134.

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The present research investigates the details of mixture preparation and combustion in a two-stroke, small-scale research engine with a numerical methodology based on large eddy simulation (LES) technique. A major motivation to study such small-scale engines is their potential use in applications requiring portable power sources with high power density. The investigated research engine has a rectangular planform with a thickness very close to quenching limits of typical hydrocarbon fuels. As such, the combustor has a high aspect ratio (defined as the ratio of surface area to volume) that makes

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