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Dissertations / Theses on the topic 'Low-Mach number flows'

Author: Grafiati

Published: 25 January 2025

Last updated: 31 July 2025

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1

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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2

Detandt, Yves. "Numerical simulation of aerodynamic noise in low Mach number flows." Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210675.

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The evaluation of the noise produced by flows has reached a high level of importance in the past years. The physics surrounding flow-induced noise is quite complex and sensitive to various flow conditions like temperature, shape. Empirical models were built in the past for some special geometries but they cannot be used in a general case for a shape optimization for instance. Experimental aeroacoustic facilities represent the main tool for acoustic analyses of flow fields, but are quite expensive because extreme care must be exercised not to introduce acoustic perturbations in the flow (silent

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3

Alkishriwi, Nouri [Verfasser]. "Large Eddy Simulation of Low Mach Number Flows / Nouri Alkishriwi." Aachen : Shaker, 2007. http://d-nb.info/1164341499/34.

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4

Holmberg, Andreas. "Experimental Determination of Aeracoustic Sources in Low Mach Number Internal Flows." Licentiate thesis, KTH, MWL Strömningsakustik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26133.

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In this thesis, the in-duct experimental methods for determining aeroacoustic N-ports of in-duct elements are discussed and improved. The scattering matrix determination methods and the related wave decomposition methods are evaluated from measurements in an empty duct carrying a mean flow. The improvements of a new over-determination method for the source part of the N-port is studied using simulations and measurements; in quiescent air as well as measurements of the flow associated noise of a mixer plate, here a triangular plate inserted at an angle in a duct. The new method is shown to impr

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5

Weng, Chenyang. "Modeling of sound-turbulence interaction in low-Mach-number duct flows." Licentiate thesis, KTH, MWL Strömningsakustik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129319.

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When sound waves propagate in a duct in the presence of turbulent flow, tur- bulent mixing can cause extra attenuation of the sound waves in addition to that caused by the viscothermal eects. Experiments show that compared to the vis- cothermal eects, turbulent absorption becomes the dominant contribution to the sound attenuation at suciently low frequencies. The mechanism of this turbulent absorption is attributed to the turbulent stress and the turbulent heat transfer act- ing on the coherent perturbations (including to sound waves) near the duct wall, i.e. sound-turbulence interaction. The

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6

Huval, Danny J. "Heat transfer in variable density, low mach number, stagnating turbulent flows." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/12394.

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7

Zucchini, Marco. "Experimental and numerical aeroacoustic investigation of impinging flows at low Mach number." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-31104.

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8

Weng, Chenyang. "Theoretical and numerical studies of sound propagation in low-Mach-number duct flows." Doctoral thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168031.

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When sound waves propagate in a duct in the presence of turbulent flow, turbulent mixing can cause attenuation of the sound waves extra to that caused by the viscothermal effects. Experiments show that compared to the viscothermal effects, this turbulent absorption becomes the dominant contribution to the sound attenuation at sufficiently low frequencies. The mechanism of this turbulent absorption is attributed to the turbulent stress and the turbulent heat transfer acting on the coherent perturbations (including the sound waves) near the duct wall, i.e. sound-turbulence interaction. The purpo

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9

Avila, Matías. "Nonlinear subgrid finite element models for low Mach number flows coupled with radiative heat transfer." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/285809.

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The general description of a fluid flow involves the solution of the compressible Navier-Stokes equations, a very complex problem whose mathematical structure is not well understood. It is widely accepted that these equations provide an accurate description of any problem in fluid mechanics which may present many different nonlinear physical mechanisms. Depending on the physics of the problem under consideration, different simplified models neglecting some physical mechanisms can be derived from asymptotic analysis. On the other hand, radiative heat transfer can strongly interact with convect

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10

Kierkegaard, Axel. "Numerical investigations of generation and propagation of sound waves in low mach number internal flows /." Stockholm : Department of Aeronautical and Vehicle Engineering, Royal Institute of Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9388.

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11

Miczek, Fabian [Verfasser], Friedrich [Akademischer Betreuer] Röpke, and Björn [Akademischer Betreuer] Garbrecht. "Simulation of low Mach number astrophysical flows / Fabian Miczek. Gutachter: Friedrich Röpke ; Björn Garbrecht. Betreuer: Friedrich Röpke." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1034951963/34.

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12

Kraushaar, Matthias. "Application of the compressible and low-mach number approaches to large-eddy simulation of turbulent flows in aero-engines." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0114/document.

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La Simulation aux Grandes Echelles (SGE) est de plus en plus utilisée dans les processus de développement et la conception des réacteurs aéronautiques industriels. L'une des raisons pour ce besoin résulte dans la capacité de la SGE à fournir des informations instantanées d'un écoulement turbulent augmentant la quantité des prédictions de la composition des gaz d'échappement. Ce manuscrit de thèse aborde deux sujets récurrents de la SGE. D'une part, les schémas numériques pour la SGE nécessitent certaines propriétés, notamment une précision élevée avec une diffusivité faible pour ne pas nuire a

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13

Klein, Benedikt [Verfasser], Martin [Akademischer Betreuer] Oberlack, and Johannes [Akademischer Betreuer] Janicka. "A high-order Discontinuous Galerkin solver for incompressible and low-Mach number flows / Benedikt Klein. Betreuer: Martin Oberlack ; Johannes Janicka." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://d-nb.info/1112044507/34.

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14

Schmidt, Steffen Joachim [Verfasser], Nikolaus A. [Akademischer Betreuer] [Gutachter] Adams, and Terwisga Tom J. C. [Gutachter] van. "A low Mach number consistent compressible approach for simulation of cavitating flows / Steffen Joachim Schmidt ; Gutachter: Tom J. C. van Terwisga, Nikolaus A. Adams ; Betreuer: Nikolaus A. Adams." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1121206689/34.

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15

Calegari, Priscila Cardoso. "Simulação computacional de escoamentos reativos com baixo número Mach aplicando técnicas de refinamento adaptativo de malhas." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/45/45132/tde-21082012-051927/.

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O foco principal do presente trabalho é estender uma metodologia numérica embasada no uso de uma técnica de refinamento adaptativo de malha (AMR - Adaptive Mesh Refinement) e no uso de esquemas temporais multipasso implícitos-explícitos (IMEX) a aplicações envolvendo escoamentos reativos com baixo número de Mach. Originalmente desenvolvida para escoamentos incompressíveis, a formulação euleriana daquela metodologia emprega as equações de Navier-Stokes como modelo matemático para descrever a dinâmica do escoamento e o Método da Projeção, baseado no divergente nulo da velocidade do escoamento, p

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16

Courtin, Victor. "Extensions of some approximate Riemann Solvers for the computation of mixed incompressible-compressible flows." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASM041.

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Dans cette thèse, on s'intéresse à la simulation d'écoulements compressibles à l'aide de méthodes numériques implicites de type solveurs de Riemann, telles que la méthode de Roe ou le schéma HLLC. L'objectif est de développer des extensions faible nombre de Mach afin de préserver la précision des solutions discrètes dans la limite bas Mach. Ce type d'écoulement est souvent rencontré dans la simulation de configurations industrielles, caractérisées par la présence de zones plus ou moins étendues à faible vitesse.On se focalise sur la composante hyperbolique des équations de Navier-Stokes, qui c

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17

Chauveheid, Daniel. "Ecoulements multi-matériaux et multi-physiques : solveur volumes finis eulérien co-localisé avec capture d’interfaces, analyse et simulations." Thesis, Cachan, Ecole normale supérieure, 2012. http://www.theses.fr/2012DENS0032/document.

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Ce travail de thèse porte sur l'extension et l'analyse d'un solveur volumes finis eulérien, co-localisé avec capture d'interfaces pour la simulation des écoulements multi-matériaux non miscibles. Les extensions proposées s'inscrivent dans la volonté d'élaborer un outil de simulation multi-physiques. Dans le cadre de ce mémoire, le caractère multi-physiques recouvre les champs que nous allons détailler. Nous traitons le cas des écoulements radiatifs modélisés par un système à deux températures qui couple les phénomènes purement hydrodynamiques aux phénomènes radiatifs. Nous proposons un solveur

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18

Dupuy, Dorian. "Analyse et modélisation de l'interaction entre thermique et turbulence dans les récepteurs solaires à haute température." Thesis, Perpignan, 2018. http://www.theses.fr/2018PERP0038/document.

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Dans les centrales solaires à tour, le flux solaire est concentré vers un récepteur solaire où son énergie est transférée à un fluide caloporteur. L'écoulement au sein du récepteur solaire est turbulent, fortement anisotherme et à bas nombre de Mach. L'optimisation du récepteur solaire exige une meilleure compréhension et modélisation de l'interaction entre la température et la turbulence. Cette thèse cherche à y contribuer selon deux approches. Tout d'abord, on étudie les échanges énergétiques entre les différentes parties de l'énergie totale. On propose pour cela une nouvelle représentation

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19

Malandain, Mathias. "Simulations massivement parallèles des écoulements turbulents à faible nombre de Mach." Phd thesis, INSA de Rouen, 2013. http://tel.archives-ouvertes.fr/tel-00834845.

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L'objectif de cette thèse est l'accélération des solveurs de Gradient Conjugué avec déflation utilisés pour la résolution de l'équation de Poisson pour la pression, dans le cas de la simulation d'écoulements à faible nombre de Mach sur des maillages non structurés. Une méthode de redémarrage basée sur une estimation de l'effet des erreurs numériques a été mise en œuvre et validée. Par la suite, une méthode à trois niveaux de maillage a été créée, et deux techniques ont dû être développées pour réduire le nombre d'itérations sur les niveaux grossiers : l'une permet la création de solutions init

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20

Haddad, Adel. "Modèles numériques à faibles nombres de Mach pour l'étude d'écoulements en convection naturelle et mixte." Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10154.

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Le modèle numérique que nous avons développé au cours de cette thèse présente deux caractéristiques principales : un modèle dilatable pour l'eau et la prise en compte de domaines ouverts. Les difficultés associées au premier aspect concernent l'adaptation de la loi d'état de l’eau au modèle dilatable sous l’approximation à faibles nombres de Mach, tandis que celles associées au second sont relatives à la mise en œuvre de conditions aux limites numériques de sortie compatibles avec l'algorithme de projection utilisé. Les résultats de simulations d'écoulement de convection mixte en canal horizon

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21

Birken, Philipp [Verfasser]. "Numerical Simulation of Flows at Low Mach Numbers with Heat Sources / Philipp Birken." Aachen : Shaker, 2006. http://d-nb.info/117052916X/34.

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22

Nana, Cyril. "Simulation du bruit d'écoulements anisothermes par méthodes hybrides pour de faibles nombres de Mach." Phd thesis, Université de Poitiers, 2012. http://tel.archives-ouvertes.fr/tel-00741298.

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Cette étude porte sur le calcul numérique du champ acoustique rayonné par des écoulements subsoniques turbulents présentant des inhomogénéités de température. Des méthodes hybrides sont développées grâce à un développement de Janzen-Rayleigh des équations de Navier-Stokes. L'écoulement est résolu par un calcul quasi incompressible puis les perturbations acoustiques sont propagées selon deux méthodes : les équations d'Euler linéarisées (EEL) et l'approximation à faible nombre de Mach perturbée (PLMNA). Les méthodes sont validées sur des cas simples puis appliquées à une couche de mélange isothe

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23

Parasiliti, Rantone Giuseppe. "Physical, mathematical and numerical modelling of a gas flow in pipeline networks with low Mach number expansion." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS547.

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Cette étude porte sur les écoulements de gaz à faible vitesse dans des réseaux de tuyaux, en se concentrant sur un régime caractérisé par un faible nombre de Mach. Nous utilisons un modèle unidimensionnel obtenu en moyennant les équations de Navier-Stokes pour un fluide compressible sur la section d'une conduite. Notre approche utilise le développement asymptotique à faible nombre de Mach pour décrire les effets compressibles de manière plus précise, contrairement à l'approximation classique de Boussinesq qui en est un cas limite lorsque l'élévation de température est assez faible. Nous utilis

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24

Ekaterinaris, John A. "Steady and unsteady internal flow computations via the solution of the compressible navier stokes equations for low mach numbers." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/12366.

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25

Sinibaldi, Edoardo. "Implicit preconditioned numerical schemes for the simulation of three-dimensional barotropic flows." Doctoral thesis, Scuola Normale Superiore, 2006. http://hdl.handle.net/11384/85704.

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A numerical method for simulating three-dimensional, generic barotropic flows on unstructured grids is developed. Space and time discretizations are separately considered. A finite volume compressible approach, based on a suitable Roe numerical flux function, is proposed and the accuracy of the resulting semi-discrete formulation for nearly-incompressible flows is ensured by ad hoc preconditioning. Moreover, a linearized implicit time-advancing technique is proposed, only relying on the algebraic properties of the Roe flux function and therefore applicable to a variety of problems. This

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26

Gokpi, Kossivi. "Modélisation et Simulation des Ecoulements Compressibles par la Méthode des Eléments Finis Galerkin Discontinus." Thesis, Pau, 2013. http://www.theses.fr/2013PAUU3005/document.

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L’objectif de ce travail de thèse est de proposer la Méthodes des éléments finis de Galerkin discontinus (DGFEM) à la discrétisation des équations compressibles de Navier-Stokes. Plusieurs challenges font l’objet de ce travail. Le premier aspect a consisté à montrer l’ordre de convergence optimal de la méthode DGFEM en utilisant les polynômes d’interpolation d’ordre élevé. Le deuxième aspect concerne l’implémentation de méthodes de ‘‘shock-catpuring’’ comme les limiteurs de pentes et les méthodes de viscosité artificielle pour supprimer les oscillations numériques engendrées par l’ordre élevé

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27

Delmas, Simon. "Simulation numérique directe d'un jet en écoulement transverse à bas nombre de Mach en vue de l'amélioration du refroidissement par effusion des chambres de combustion aéronautiques." Thesis, Pau, 2015. http://www.theses.fr/2015PAUU3035/document.

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Dans cette thèse on s'intéresse aux jets en écoulement transverse dans une configuration générique de celle du refroidissement par effusion de chambres de combustion aéronautiques. L'amélioration des modèles de paroi avec transfert de masse passe par une meilleure connaissance de l'interaction entre les jets et l’écoulement principal. Nous avons donc réalisé la simulation numérique directe d'un jet issu d'un perçage incliné avec ou sans giration, pour des écoulements isothermes, turbulents et à bas nombre de Mach, dans un contexte compressible. Pour cela nous avons travaillé avec la bibliothèq

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28

Khalighi, Yaser Moin Parviz Lele Sanjiva K. Wang Meng. "Computational aeroacoustics of complex flows at low Mach number." 2010. http://purl.stanford.edu/gj871wv3443.

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29

Nigro, Alessandra, Maria Laura Luchi, Bartolo Carmine De, and Francesco Bassi. "Discontinuous Galerkin Methods for inviscid low Mach number flows." Thesis, 2014. http://hdl.handle.net/10955/366.

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Dottorato di ricerca in Ingegneria Meccanica, XX Ciclo, a.a. 2007<br>In this work we present two preconditioning techniques for inviscid low Mach number flows. The space discretization used is a high-order Discontinuous Galerkin finite element method. The time discretizations analyzed are explicit and implicit schemes. The convective physical flux is replaced by a flux difference splitting scheme. Computations were performed on triangular and quadrangular grids to analyze the influence of the spatial discretization. For the preconditioning of the explicit Euler equations we propose to ap

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30

Hadjiconstantinou, Nicolas G., and Alejandro L. Garcia. "Statistical Error in Particle Simulations of Low Mach Number Flows." 2002. http://hdl.handle.net/1721.1/4017.

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We present predictions for the statistical error due to finite sampling in the presence of thermal fluctuations in molecular simulation algorithms. Expressions for the fluid velocity, density and temperature are derived using equilibrium statistical mechanics. The results show that the number of samples needed to adequately resolve the flow-field scales as the inverse square of the Mach number. The theoretical results are verified for a dilute gas using direct Monte Carlo simulations. The agreement between theory and simulation verifies that the use of equilibrium theory is justified.<br>Singa

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31

URBANO, ANNAFEDERICA. "Analysis of Heat Transfer Characteristics of Supercritical Fuels in Rocket Cooling Systems by a Space Marching Numerical Technique." Doctoral thesis, 2012. http://hdl.handle.net/11573/918521.

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Methane and Liquefied Natural Gas (LNG) have been recently considered both for launch and for in-space applications because of several advantages they present if compared with other commonly used fuels. In particular, several studies are dedicated at the use of methane in liquid rocket engines with turbopumb fed systems. In this framework, the present study focuses on the use of methane or LNG as coolant in regenerative cooling systems. The study has two main purposes. The first is to understand what are the differences between using pure methane or LNG in a cooling system. The second purpose

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32

Zang, Yi-Chong, and 曾臆璁. "Numerical Investigation of Low-Mach-Number Flows on the Tetrahedral/Prismatic Meshes." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/10223416758535838990.

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碩士<br>國立成功大學<br>航空太空工程學系碩博士班<br>96<br>For the low-mach-number flows, a lot of experimental and theoretical results have been presented, but the theoretical computation is still worthwhile to study. According to the Rossow’s pressure correction concept, a numerical solution proceduce is created to investigate the low-mach-number flow behavior in this paper. First the unstructured tetrahedral and prismatic meshes are generated in the flow domain. Then the above-mentioned numerical approach is used to solve the three-dimensional Euler/Navier-Stokes equations. This approach includes four-step Rung

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33

PINNA, fabio calogero. "Numerical study of stability of flows from low to high Mach number." Doctoral thesis, 2012. http://hdl.handle.net/11573/918810.

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Interest in the study of stability lies in the strong link with the laminar-to-turbulent transition with several implications in the design of new vehicles in the aerospace community. If on one side aeronautics would like to predict and control transition to limit drag, boost efficiency and reduce the fuel consumption on the other hand, space design faces reentry problem where an accurate transition prediction could lead to a better sizing of the thermal protection system, thus enhancing the overall performance of the spacecraft. Nevertheless one has to keep in mind that transition can occur

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34

Klein, Benedikt. "A high-order Discontinuous Galerkin solver for incompressible and low-Mach number flows." Phd thesis, 2015. https://tuprints.ulb.tu-darmstadt.de/5143/1/Dissertation-Klein-2015.pdf.

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In this work, we present a high-order Discontinuous Galerkin Method (DGM) for simulating incompressible and variable density flows at low-Mach numbers. For steady cases, we apply the SIMPLE algorithm to solve the non-linear system in a segregated manner. For unsteady cases, the solver is implicit in time using backward differentiation formulae and the SIMPLE algorithm is applied to solve the non-linear system in each time step. The proposed method is implemented in the in-house software library BoSSS. The solver is extensively tested with respect to temporal and spatial convergence rates, perf

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35

Yang, Ming-Jung, and 楊銘榮. "Towards Simple Implicit Preconditioning Riemann Solvers for the Simulation of the Low Mach number Flows." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/96313237209310800704.

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碩士<br>淡江大學<br>航空太空工程學系碩士班<br>104<br>Here, a scalar matrix-free implicit type preconditioning hybrid AUSMD(R) solver for multi-phase flows is developed. The numerical stability problem caused by the multi-scale speed of sound due to uncertain dissipation terms in the current schemes which can be resolved by rescaling the eigenvalues of the Euler type system equations to enhance computational convergence. This paper presents implicit pre-conditioning approaches which indicate similarly accurate results obtained with the fully implicit and Runge-Kutta explicit schemes. The current used homogeneou

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36

Zucchini, Marco [Verfasser]. "Experimental and numerical aeroacoustic investigation of impinging flows at low Mach number / vorgelegt von Marco Zucchini." 2007. http://d-nb.info/984953256/34.

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37

Hassanaly, Malik. "Large eddy simulations (LES) of boundary layer flashback in wall-bounded flows." Thesis, 2014. http://hdl.handle.net/2152/28248.

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In the design of high-hydrogen content gas turbines for power generation, flashback of the turbulent flame by propagation through the low velocity boundary layers in the premixing region is an operationally dangerous event. The high reactivity of hydrogen combined with enhanced flammability lim- its (compared to natural gas) promotes flame propagation along low-speed boundary layers adjoining the combustion walls. This work focuses on the simulation of boundary layer flashback using large-eddy simulations (LES). A canonical channel configuration is studied to assess the capabilities of LES and

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38

MINGZONG-WANG and 王銘宗. "Solving Low-Mach Number Euler Flow with Local Preconditioning Technique." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/96576713678298720065.

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碩士<br>國立成功大學<br>機械工程學系<br>89<br>The aim of this paper is using local preconditioning methods to solve nearly incompressible flow problems with numerical algorithms that were designed for compressible flow。First，we calculate the flux jacobin of primitive variables in 3D Euler equations in the Cartesian coordinate system，then multiply a preconditioner ，and transfer matrices after preconditioning。Final，we obtain the flux jacobin matrix of conservative variables 。The aim of the local preconditioning is changing numerical modes of Euler equations，and overcome the large disparity of the acoustic w

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