Turbulence - Theory and Modelling
Turbulens - teori och modellering

MVKN90F, 7.5 högskolepoäng

Gäller från och med: Autumn 2019
Beslutad av: Anders Gustafsson / FUN
Datum för fastställande: 2019-10-26

Allmänna uppgifter

Avdelning: Energy Sciences
Kurstyp: Gemensam kurs, avancerad nivå och forskarnivå
Kursen ges även på avancerad nivå med kurskod: MVKN90
Undervisningsspråk: English

Syfte

The aim of this course is to provide basic theoretical knowledge on turbulence as well as the design of turbulence models and their applicability. Furthermore, the intention is to provide skills in the analysis of turbulent flows. This knowledge should be sufficient to understand the background of turbulence models and the ability to chose an appropriate turbulence model for a given flow case.

Mål

Kunskap och förståelse

För godkänd kurs skall doktoranden

• be able to describe the physical mechanisms of the transition from laminar to turbulent flow for a simple flow case
• be able to explain Kolmogorov’s theory, including the basic assumptions and the validity of the theory
• be able to, from a phenomenological perspective, assess if a flow is turbulent
• be able to explain the important and basic terms of the subject
• be able to describe the character of the turbulence in different flow situations with respect to the properties and development of the turbulence, and explain how the differences between these flow situations are reflected in the modelling

Färdighet och förmåga

För godkänd kurs skall doktoranden

• be able to analyse a flow case and suggest a method for numerical simulation with respect to governing equations, possible simplifications and choice of turbulence model, and also to compare with alternative methods.
• be able to scrutinise and estimate the credibility of results from turbulent flow simulations

Värderingsförmåga och förhållningssätt

För godkänd kurs skall doktoranden

• be able to actively participate in discussion of problems relevant for the subject
• be able to present, both orally and in writing, a technical report containing analyses and choice of turbulence model

Kursinnehåll

The course contains the basic theory for turbulent flows, the transition from laminar to turbulent flows and the physical basis for different types of turbulence models. The turbulence theory part contains statistical and phenomenological description of turbulence Kolmogorov’s hypotheses, and also wall bounded and free shear flows. Homogeneous and isotropic turbulence is discussed as well as anisotropy in different types of flow. The modelling part contains the most common types of turbulence models, i.e. the ones based on the Reynolds averaged equations and Large Eddy Simulation. The physical background and effects of different models are discussed. The mathematical description is also treated, averaging of the governing equations, and derivation of the extra equations needed.

Kurslitteratur

Pope, S. B: Turbulent Flows. Cambridge University Press, 2003. ISBN 0521598869.

Kursens undervisningsformer

Undervisningsformer: Föreläsningar, seminarier, laborationer, övningar, projekt

Kursens examination

Examinationsformer: Muntlig tentamen, skriftlig rapport, inlämningsuppgifter, seminarieföredrag av deltagarna. The compulsory home works and laboratory exercises are reported in writing, individually. The project assignment is reported both in writing and orally at a seminar, where active participation at the other presentations is also required. Giving a seminar on a specific topic from the course is also required. To get a passing grade all compulsory parts, i.e. home works, laboratory exercises, seminar, project assignment and oral exam must be approved
Betygsskala: Underkänd, godkänd
Examinator:

Antagningsuppgifter

Förkunskapskrav: Basic course in fluid mechanics
Förutsatta förkunskaper: Mathematics equivalent to a master degree in mechanical engineering

Övrig information

Course coordinator: prof. Johan Revstedt, johan.revstedt@energy.lth.se, 046-2224302

Kurstillfällesinformation

Kontaktinformation och övrigt

Kursansvarig: Johan Revstedt <johan.revstedt@energy.lth.se>
Hemsida: http://www.fm.energy.lth.se/english/education/courses/turbulence-theory-and-modelling-mvkn90/