[CFD] Large Eddy Simulation (LES): An Introduction

An introduction to Large Eddy Simulation (LES) and how to make the transition from RANS to LES. The following topics are covered:

1) 3:13 How are eddies resolved in CFD?

2) 8:23 What is the turbulent energy cascade and why is it important for LES?

3) 15:25 How fine does the mesh need to be for LES?

#les #cfd #fluidmechanics101

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Some useful references:

1) ANSYS Best Practice Guide for LES
F. R. Menter 'Best Practice: Scale-Resolving Simulations in ANSYS CFD', version 2.00. November 2015. Available from ANSYS Customer Portal.

2) ANSYS LES Quick Setup Guide
A. Gerasimov, 'Quick Guide to Setting Up LES-type simulations', version 1.4, May 2016.
Available from ANSYS Customer Portal.

3) P. R. Spalart, 'Young-Person's Guide to Deteched-Eddy Simulation Grids', NASA/CR-2001-211032, July 2001.
http://qnet-ercoftac.cfms.org.uk/w/im...

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Disclaimer
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The methods, algorithms, equations, formulae, diagrams and explanations in this talk are for educational and demonstrative purposes only. They should never be used to analyse, design, accredit or validate real scientific / engineering / mathematical structures and flow systems. For such applications, appropriate trained, qualified and accredited (SQEP) engineers / scientists should be consulted along with the appropriate documentation, procedures and engineering standards. Furthermore, the information contained within this talk has not been verified, peer reviewed or checked in any way and is likely to contain several errors. It is therefore not appropriate to use this talk itself (or any of the algorithms, equations, formulae, diagrams and explanations contained within this talk) as an academic or technical reference. The reader should consult the original references and follow the verification and validation processes adopted by your company / institution when carrying out engineering calculations and analyses. Fluid Mechanics 101 and Dr. Aidan Wimshurst are not accountable or liable in any form for the use or misuse of the information contained in this talk beyond the specific educational and demonstrative purposes for which it was intended.