This volume contains selected presentations of the "EUROMECH
Colloquium 412 on LES of complex transitional and turbulent flows"
held at the Munich University of Technology from 4 to 6 October
2000.
The articles focus on new developments in the field of
large-eddy simulation of complex flows and are related to the
topics: modelling and analysis of subgrid scales, numerical issues
in LES cartesian grids for complex geometries, curvilinear and
non-structured grids for complex geometries. DES and RANS-LES
coupling, aircraft wake vortices, combustion and
magnetohydrodynamics.
Progress has been made not only in understanding and modelling
the dynamics of unresolved scales, but also in designing means that
prevent the contamination of LES predictions by discretization
errors. Progress is reported as well on the use of cartesian and
curvilinear coordinates to compute flow in and around complex
geometries and in the field of LES with unstructured grids. A
chapter is dedicated to the detached-eddy simulation technique and
its recent achievements and to the promising technique of coupling
RANS and LES solutions in order to push the resolution-based
Reynolds number limit of wall-resolving LES to higher values.
Complexity due to physical mechanisms links the last two
chapters. It is shown that LES constitutes the tool to analyse the
physics of aircraft wake vortices during landing and takeoff. Its
thorough understanding is a prerequisite for reliable predictions
of the distance between consecutive landing airplanes. Subgrid
combustion modelling for LES of single and two-phase reacting flows
is demonstrated to have the potential to deal with finite-rate
kinetics in high Reynolds numberflows of full-scale gas turbine
engines. Fluctuating magnetic fields are more reliably predicted by
LES when tensor-diffusivity rather than gradient-diffusion models
are used. An encouraging result in the context of turbulence
control by magnetic fields.
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