Author:
VREMAN BERT,GEURTS BERNARD,KUERTEN HANS
Abstract
Six subgrid models for the turbulent stress tensor are tested by
conducting large-eddy
simulations (LES) of the weakly compressible temporal mixing layer: the Smagorinsky,
similarity, gradient, dynamic eddy-viscosity, dynamic mixed and dynamic Clark
models. The last three models are variations of the first three models using the
dynamic approach. Two sets of simulations are performed in order to assess the
quality of the six models. The LES results corresponding to the
first set are compared
with filtered results obtained from a direct numerical simulation (DNS). It appears
that the dynamic models lead to more accurate results than the non-dynamic models
tested. An adequate mechanism to dissipate energy from resolved to subgrid scales
is essential. The dynamic models have this property, but the Smagorinsky model is
too dissipative during transition, whereas the similarity and gradient models are not
sufficiently dissipative for the smallest resolved scales. In this
set of simulations, at
moderate Reynolds number, the dynamic mixed and Clark models are found to be
slightly more accurate than the dynamic eddy-viscosity model. The second set of LES
concerns the mixing layer at a considerably higher Reynolds number and in a larger
computational domain. An accurate DNS for this mixing layer can currently not be
performed, thus in this case the LES are tested by investigating whether
they resemble a self-similar turbulent flow. It is found that the dynamic
models generate better
results than the non-dynamic models. The closest approximation to a self-similar
state was obtained using the dynamic eddy-viscosity model.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
405 articles.
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