Author:
PORTÉ-AGEL FERNANDO,MENEVEAU CHARLES,PARLANGE MARC B.
Abstract
A scale-dependent dynamic subgrid-scale model for large-eddy simulation of turbulent
flows is proposed. Unlike the traditional dynamic model, it does not rely on the
assumption that the model coefficient is scale invariant. The model is based on a
second test-filtering operation which allows us to determine from the simulation how
the coefficient varies with scale. The scale-dependent model is tested in simulations
of a neutral atmospheric boundary layer. In this application, near the ground the
grid scale is by necessity comparable to the local integral scale (of the order of the
distance to the wall). With the grid scale and/or the test-filter scale being outside the
inertial range, scale invariance is broken. The results are compared with those from
(a) the traditional Smagorinsky model that requires specification of the coefficient and
of a wall damping function, and (b) the standard dynamic model that assumes scale
invariance of the coefficient. In the near-surface region the traditional Smagorinsky
and standard dynamic models are too dissipative and not dissipative enough, respectively.
Simulations with the scale-dependent dynamic model yield the expected trends
of the coefficient as a function of scale and give improved predictions of velocity
spectra at different heights from the ground. Consistent with the improved dissipation
characteristics, the scale-dependent model also yields improved mean velocity profiles.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
483 articles.
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