Computational resources have developed to the level that, for
the first time, it is becoming possible to apply large-eddy
simulation (LES) to turbulent flow problems of realistic
complexity. Many examples can be found in technology and in a
variety of natural flows. This puts issues related to assessing,
assuring, and predicting the quality of LES into the spotlight.
Several LES studies have been published in the past, demonstrating
a high level of accuracy with which turbulent flow predictions can
be attained, without having to resort to the excessive requirements
on computational resources imposed by direct numerical simulations.
However, the setup and use of turbulent flow simulations requires a
profound knowledge of fluid mechanics, numerical techniques, and
the application under consideration. The susceptibility of
large-eddy simulations to errors in modelling, in numerics, and in
the treatment of boundary conditions, can be quite large due to
nonlinear accumulation of different contributions over time,
leading to an intricate and unpredictable situation. A full
understanding of the interacting error dynamics in large-eddy
simulations is still lacking. To ensure the reliability of
large-eddy simulations for a wide range of industrial users, the
development of clear standards for the evaluation, prediction, and
control of simulation errors in LES is summoned. The workshop on
Quality and Reliability of Large-Eddy Simulations, held October
22-24, 2007 in Leuven, Belgium (QLES2007), provided one of the
first platforms specifically addressing these aspects of LES.
General
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