Suchergebnis: Katalogdaten im Herbstsemester 2017
Rechnergestützte Wissenschaften Master | ||||||
Vertiefungsgebiete | ||||||
Fluiddynamik Eine der beiden Lerneinheiten 151-0103-00L Fluiddynamik II 151-0109-00L Turbulent Flows ist obligatorisch. Studierenden, welche deutschsprachigen Lehrveranstaltungen folgen können, wird 151-0103-00L Fluiddynamik II empfohlen. | ||||||
Nummer | Titel | Typ | ECTS | Umfang | Dozierende | |
---|---|---|---|---|---|---|
151-0103-00L | Fluiddynamik II | O | 3 KP | 2V + 1U | P. Jenny | |
Kurzbeschreibung | Ebene Potentialströmungen: Stromfunktion und Potential, Singularitätenmethode, instationäre Strömung, aerodynamische Begriffe. Drehungsbehaftete Strömungen: Wirbelstärke und Zirkulation, Wirbeltransportgleichung, Wirbelsätze von Helmholtz und Kelvin. Kompressible Strömungen: Stromfadentheorie, senkrechter und schiefer Verdichtungsstoss, Laval-Düse, Prandtl-Meyer-Expansion, Reibungseinfluss. | |||||
Lernziel | Erweiterung der Grundlagen der Fluiddynamik. Grundbegriffe, Phänomene und Gesetzmässigkeiten von drehungsfreien, drehungsbehafteten und eindimensionalen kompressiblen Strömungen vermitteln. | |||||
Inhalt | Ebene Potentialströmungen: Stromfunktion und Potential, komplexe Darstellung, Singularitätenmethode, instationäre Strömung, aerodynamische Begriffe. Drehungsbehaftete Strömungen: Wirbelstärke und Zirkulation, Wirbeldynamik und Wirbeltransportgleichung, Wirbelsätze von Helmholtz und Kelvin. Kompressible Strömungen: Stromfadentheorie, senkrechter und schiefer Verdichtungsstoss, Laval-Düse, Prandtl-Meyer-Expansion, Reibungseinfluss. | |||||
Skript | ja (Siehe auch untenstehende Information betreffend der Literatur.) | |||||
Literatur | P.K. Kundu, I.M. Cohen, D.R. Dowling: Fluid Mechanics, Academic Press, 5th ed., 2011 (includes a free copy of the DVD "Multimedia Fluid Mechanics") P.K. Kundu, I.M. Cohen, D.R. Dowling: Fluid Mechanics, Academic Press, 6th ed., 2015 (does NOT include a free copy of the DVD "Multimedia Fluid Mechanics") | |||||
Voraussetzungen / Besonderes | Analysis I/II, Fluiddynamik I, Grundbegriffe der Thermodynamik (Thermodynamik I). Für die Formulierung der Grundlagen der Fluiddynamik werden unabdingbar Begriffe und Ergebnisse aus der Mathematik benötigt. Erfahrungsgemäss haben einige Studierende damit Schwierigkeiten. Es wird daher dringend empfohlen, insbesondere den Stoff über - elementare Funktionen (wie sin, cos, tan, exp, deren Umkehrfunktionen, Ableitungen und Integrale) sowie über - Vektoranalysis (Gradient, Divergenz, Rotation, Linienintegral ("Arbeit"), Integralsätze von Gauss und von Stokes, Potentialfelder als Lösungen der Laplace-Gleichung) zu wiederholen. Ferner wird der Umgang mit - komplexen Zahlen und Funktionen (siehe Anhang des Skripts Analysis I/II Teil C und Zusammenfassung im Anhang C des Skripts Fluiddynamik) benötigt. Literatur z.B.: U. Stammbach: Analysis I/II, Skript Teile A, B und C. | |||||
151-0109-00L | Turbulent Flows | W | 4 KP | 2V + 1U | P. Jenny | |
Kurzbeschreibung | Inhalt - Laminare und turbulente Strömungen, Turbulenzentstehung - Statistische Beschreibung: Mittelung, Turbulenzenergie, Dissipation, Schliessungsproblem - Skalenbetrachtungen. Homogene isotrope Turbulenz, Korrelationen, Fourierzerlegung, Energiespektrum - Freie Turbulenz. Nachlauf, Freistrahl, Mischungsschicht - Wandturbulenz. Turbulente Grenzschicht, Kanalströmung - Turbulenzberechnung | |||||
Lernziel | Die Vorlesung vermittelt einen Einblick in grundlegende physikalische Phänomene turbulenter Strömungen und in Gesetzmässigkeiten zu ihrer Beschreibung, basierend auf den strömungsmechanischen Grundgleichungen und daraus abgeleiteten Gleichungen. Grundlagen zur Berechnung turbulenter Strömungen und Elemente der Turbulenzmodellierung werden dargestellt. | |||||
Inhalt | - Eigenschaften laminarer, transitioneller und turbulenter Strömungen - Turbulenzbeeinflussung und Turbulenzentstehung, hydrodynamische Instabilität und Transition - Statistische Beschreibung: Mittelung, Gleichungen für mittlere Strömung, turbulente Schwankungen, Turbulenzenergie, Reynoldsspannungen, Dissipation. Schliessungsproblem - Skalenbetrachtungen. Homogene isotrope Turbulenz, Korrelationen, Fourierzerlegung, Energiespektrum, Gitterturbulenz - Freie Turbulenz. Nachlauf, Freistrahl, Mischungsschicht - Wandturbulenz. Turbulente Grenzschicht, Kanalströmung - Grundlagen zur Berechnung turbulenter Strömungen und Elemente der Turbulenzmodellierung (Wirbelzähigkeitsmodelle, k-epsilon-Modell). | |||||
Skript | Lecture notes in English, zusätzliches schriftliches Begleitmaterial auf Deutsch | |||||
Literatur | S.B. Pope, Turbulent Flows, Cambridge University Press, 2000 | |||||
151-0182-00L | Fundamentals of CFD Methods | W+ | 4 KP | 3G | A. Haselbacher | |
Kurzbeschreibung | This course is focused on providing students with the knowledge and understanding required to develop simple computational fluid dynamics (CFD) codes to solve the incompressible Navier-Stokes equations and to critically assess the results produced by CFD codes. As part of the course, students will write their own codes and verify and validate them systematically. | |||||
Lernziel | 1. Students know and understand basic numerical methods used in CFD in terms of accuracy and stability. 2. Students have a basic understanding of a typical simple CFD code. 3. Students understand how to assess the numerical and physical accuracy of CFD results. | |||||
Inhalt | 1. Governing and model equations. Brief review of equations and properties 2. Overview of basic concepts: Overview of discretization process and its consequences 3. Overview of numerical methods: Finite-difference and finite-volume methods 4. Analysis of spatially discrete equations: Consistency, accuracy, stability, convergence of semi-discrete methods 5. Time-integration methods: LMS and RK methods, consistency, accuracy, stability, convergence 6. Analysis of fully discrete equations: Consistency, accuracy, stability, convergence of fully discrete methods 7. Solution of one-dimensional advection equation: Motivation for and consequences of upwinding, Godunov's theorem, TVD methods, DRP methods 8. Solution of two-dimensional advection equation: Dimension-by-dimension methods, dimensional splitting, multidimensional methods 9. Solution of one- and two-dimensional diffusion equations: Implicit methods, ADI methods 10. Solution of one-dimensional advection-diffusion equation: Numerical vs physical viscosity, boundary layers, non-uniform grids 11. Solution of incompressible Navier-Stokes equations: Incompressibility constraint and consequences, fractional-step and pressure-correction methods 12. Solution of incompressible Navier-Stokes equations on unstructured grids | |||||
Skript | The course is based mostly on notes developed by the instructor. | |||||
Literatur | Literature: There is no required textbook. Suggested references are: 1. H.K. Versteeg and W. Malalasekera, An Introduction to Computational Fluid Dynamics, 2nd ed., Pearson Prentice Hall, 2007 2. R.H. Pletcher, J.C. Tannehill, and D. Anderson, Computational Fluid Mechanics and Heat Transfer, 3rd ed., Taylor & Francis, 2011 | |||||
Voraussetzungen / Besonderes | Prior knowledge of fluid dynamics, applied mathematics, basic numerical methods, and programming in Fortran and/or C++ (knowledge of MATLAB is *not* sufficient). | |||||
151-0105-00L | Quantitative Flow Visualization | W | 4 KP | 2V + 1U | T. Rösgen | |
Kurzbeschreibung | The course provides an introduction to digital image analysis in modern flow diagnostics. Different techniques which are discussed include image velocimetry, laser induced fluorescence, liquid crystal thermography and interferometry. The physical foundations and measurement configurations are explained. Image analysis algorithms are presented in detail and programmed during the exercises. | |||||
Lernziel | Introduction to modern imaging techniques and post processing algorithms with special emphasis on flow analysis and visualization. Understanding of hardware and software requirements and solutions. Development of basic programming skills for (generic) imaging applications. | |||||
Inhalt | Fundamentals of optics, flow visualization and electronic image acquisition. Frequently used mage processing techniques (filtering, correlation processing, FFTs, color space transforms). Image Velocimetry (tracking, pattern matching, Doppler imaging). Surface pressure and temperature measurements (fluorescent paints, liquid crystal imaging, infrared thermography). Laser induced fluorescence. (Digital) Schlieren techniques, phase contrast imaging, interferometry, phase unwrapping. Wall shear and heat transfer measurements. Pattern recognition and feature extraction, proper orthogonal decomposition. | |||||
Skript | available | |||||
Voraussetzungen / Besonderes | Prerequisites: Fluiddynamics I, Numerical Mathematics, programming skills. Language: German on request. | |||||
151-0213-00L | Fluid Dynamics with the Lattice Boltzmann Method | W | 4 KP | 3G | I. Karlin | |
Kurzbeschreibung | The course provides an introduction to theoretical foundations and practical usage of the Lattice Boltzmann Method for fluid dynamics simulations. | |||||
Lernziel | Methods like molecular dynamics, DSMC, lattice Boltzmann etc are being increasingly used by engineers all over and these methods require knowledge of kinetic theory and statistical mechanics which are traditionally not taught at engineering departments. The goal of this course is to give an introduction to ideas of kinetic theory and non-equilibrium thermodynamics with a focus on developing simulation algorithms and their realizations. During the course, students will be able to develop a lattice Boltzmann code on their own. Practical issues about implementation and performance on parallel machines will be demonstrated hands on. Central element of the course is the completion of a lattice Boltzmann code (using the framework specifically designed for this course). The course will also include a review of topics of current interest in various fields of fluid dynamics, such as multiphase flows, reactive flows, microflows among others. Optionally, we offer an opportunity to complete a project of student's choice as an alternative to the oral exam. Samples of projects completed by previous students will be made available. | |||||
Inhalt | The course builds upon three parts: I Elementary kinetic theory and lattice Boltzmann simulations introduced on simple examples. II Theoretical basis of statistical mechanics and kinetic equations. III Lattice Boltzmann method for real-world applications. The content of the course includes: 1. Background: Elements of statistical mechanics and kinetic theory: Particle's distribution function, Liouville equation, entropy, ensembles; Kinetic theory: Boltzmann equation for rarefied gas, H-theorem, hydrodynamic limit and derivation of Navier-Stokes equations, Chapman-Enskog method, Grad method, boundary conditions; mean-field interactions, Vlasov equation; Kinetic models: BGK model, generalized BGK model for mixtures, chemical reactions and other fluids. 2. Basics of the Lattice Boltzmann Method and Simulations: Minimal kinetic models: lattice Boltzmann method for single-component fluid, discretization of velocity space, time-space discretization, boundary conditions, forcing, thermal models, mixtures. 3. Hands on: Development of the basic lattice Boltzmann code and its validation on standard benchmarks (Taylor-Green vortex, lid-driven cavity flow etc). 4. Practical issues of LBM for fluid dynamics simulations: Lattice Boltzmann simulations of turbulent flows; numerical stability and accuracy. 5. Microflow: Rarefaction effects in moderately dilute gases; Boundary conditions, exact solutions to Couette and Poiseuille flows; micro-channel simulations. 6. Advanced lattice Boltzmann methods: Entropic lattice Boltzmann scheme, subgrid simulations at high Reynolds numbers; Boundary conditions for complex geometries. 7. Introduction to LB models beyond hydrodynamics: Relativistic fluid dynamics; flows with phase transitions. | |||||
Skript | Lecture notes on the theoretical parts of the course will be made available. Selected original and review papers are provided for some of the lectures on advanced topics. Handouts and basic code framework for implementation of the lattice Boltzmann models will be provided. | |||||
Voraussetzungen / Besonderes | The course addresses mainly graduate students (MSc/Ph D) but BSc students can also attend. | |||||
151-0207-00L | Theory and Modeling of Reactive Flows | W | 4 KP | 3G | C. E. Frouzakis, I. Mantzaras | |
Kurzbeschreibung | The course first reviews the governing equations and combustion chemistry, setting the ground for the analysis of homogeneous gas-phase mixtures, laminar diffusion and premixed flames. Catalytic combustion and its coupling with homogeneous combustion are dealt in detail, and turbulent combustion modeling approaches are presented. Available numerical codes will be used for modeling. | |||||
Lernziel | Theory of combustion with numerical applications | |||||
Inhalt | The analysis of realistic reactive flow systems necessitates the use of detailed computer models that can be constructed starting from first principles i.e. thermodynamics, fluid mechanics, chemical kinetics, and heat and mass transport. In this course, the focus will be on combustion theory and modeling. The reacting flow governing equations and the combustion chemistry are firstly reviewed, setting the ground for the analysis of homogeneous gas-phase mixtures, laminar diffusion and premixed flames. Heterogeneous (catalytic) combustion, an area of increased importance in the last years, will be dealt in detail along with its coupling with homogeneous combustion. Finally, approaches for the modeling of turbulent combustion will be presented. Available numerical codes will be used to compute the above described phenomena. Familiarity with numerical methods for the solution of partial differential equations is expected. | |||||
Skript | Handouts | |||||
Voraussetzungen / Besonderes | NEW course | |||||
401-5950-00L | Seminar in Fluid Dynamics for CSE | W | 4 KP | 2S | P. Jenny, T. Rösgen | |
Kurzbeschreibung | Enlarged knowledge and practical abilities in fundamentals and applications of Computational Fluid Dynamics | |||||
Lernziel | Enlarged knowledge and practical abilities in fundamentals and applications of Computational Fluid Dynamics | |||||
Voraussetzungen / Besonderes | Contact Prof. P. Jenny or Prof. T. Rösgen before the beginning of the semester |
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