This book contains a collection of the main contributions from the first
five workshops held by Ercoftac Special Interest Group on Synthetic
Turbulence Models (SIG42. It is intended as an illustration of the sig's
activities and of the latest developments in the field.
This volume investigates the use of Kinematic Simulation (KS) and other
synthetic turbulence models for the particular application to
environmental flows.
This volume offers the best syntheses on the research status in KS,
which is widely used in various domains, including Lagrangian aspects in
turbulence mixing/stirring, particle dispersion/clustering, and last but
not least, aeroacoustics. Flow realizations with complete spatial, and
sometime spatio-temporal, dependency, are generated via superposition of
random modes (mostly spatial, and sometime spatial and temporal, Fourier
modes), with prescribed constraints such as: strict incompressibility
(divergence-free velocity field at each point), high Reynolds energy
spectrum. Recent improvements consisted in incorporating linear
dynamics, for instance in rotating and/or stably-stratified flows, with
possible easy generalization to MHD flows, and perhaps to plasmas. KS
for channel flows have also been validated. However, the absence of
"sweeping effects" in present conventional KS versions is identified as
a major drawback in very different applications: inertial particle
clustering as well as in aeroacoustics. Nevertheless, this issue was
addressed in some reference papers, and merits to be revisited in the
light of new studies in progress.
