English

Every autumn semester

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.

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.

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

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

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

Lectures

Seminars

Laboratory exercises

Exercises

Project

Oral exam

Written report

Written assignments

Seminars given by participants

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

Failed, pass

Basic course in fluid mechanics

Mathematics equivalent to a master degree in mechanical engineering

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

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

MVKN90F

2019-10-26

Anders Gustafsson / FUN