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A dynamic subgrid-scale eddy viscosity model
Tập 3 Số 7 - Trang 1760-1765 - 1991
One major drawback of the eddy viscosity subgrid-scale stress models used in
large-eddy simulations is their inability to represent correctly with a single
universal constant different turbulent fields in rotating or sheared flows, near
solid walls, or in transitional regimes. In the present work a new eddy
viscosity model is presented which alleviates many of these drawbacks. The model
coefficien...
A proposed modification of the Germano subgrid-scale closure method
Tập 4 Số 3 - Trang 633-635 - 1992
The subgrid-scale closure method developed by Germano et al. is modified by use
of a least squares technique to minimize the difference between the closure
assumption and the resolved stresses. This modification removes a source of
singularity and is believed to improve the method’s applicability.
Development of turbulence models for shear flows by a double expansion technique
Tập 4 Số 7 - Trang 1510-1520 - 1992
Turbulence models are developed by supplementing the renormalization group (RNG)
approach of Yakhot and Orszag [J. Sci. Comput. 1, 3 (1986)] with scale
expansions for the Reynolds stress and production of dissipation terms. The
additional expansion parameter (η≡SK̄/■̄) is the ratio of the turbulent to mean
strain time scale. While low-order expansions appear to provide an adequate
description for ...
A dynamic subgrid-scale model for compressible turbulence and scalar transport
Tập 3 Số 11 - Trang 2746-2757 - 1991
The dynamic subgrid-scale (SGS) model of Germano et al. [Phys. Fluids A 3, 1760
(1991)] is generalized for the large eddy simulation (LES) of compressible flows
and transport of a scalar. The model was applied to the LES of decaying
isotropic turbulence, and the results are in excellent agreement with
experimental data and direct numerical simulations. The expression for the SGS
turbulent Prandtl ...
Preferential concentration of particles by turbulence
Tập 3 Số 5 - Trang 1169-1178 - 1991
Direct numerical simulation of isotropic turbulence was used to investigate the
effect of turbulence on the concentration fields of heavy particles. The
hydrodynamic field was computed using 643 points and a statistically stationary
flow was obtained by forcing the low-wave-number components of the velocity
field. The particles used in the simulations were time advanced according to
Stokes drag la...
A dynamic mixed subgrid-scale model and its application to turbulent recirculating flows
Tập 5 Số 12 - Trang 3186-3196 - 1993
The dynamic subgrid-scale eddy viscosity model of Germano et al. [Phys. Fluids A
3, 1760 (1991)] (DSM) is modified by employing the mixed model of Bardina et al.
[Ph.D dissertation, Stanford University (1983)] as the base model. The new
dynamic mixed model explicitly calculates the modified Leonard term and only
models the cross term and the SGS Reynolds stress. It retains the favorable
features o...
Subgrid-scale backscatter in turbulent and transitional flows
Tập 3 Số 7 - Trang 1766-1771 - 1991
Most subgrid-scale (SGS) models for large-eddy simulations (LES) are absolutely
dissipative (that is, they remove energy from the large scales at each point in
the physical space). The actual SGS stresses, however, may transfer energy to
the large scales (backscatter) at a given location. Recent work on the LES of
transitional flows [Piomelli et al., Phys. Fluids A 2, 257 (1990)] has shown
that fa...
Spectral features of wall pressure fluctuations beneath turbulent boundary layers
Tập 3 Số 10 - Trang 2410-2420 - 1991
Experimental measurements of the frequency spectra and frequency cross-spectra
of the wall pressure fluctuations beneath a turbulent boundary layer were made
in a low-noise flow facility. The data, taken over a range of flow speeds,
clearly display a dimensionless frequency (ωδ/uτ=50) at which the spectra
achieve a maximum and a low-frequency range with an approximately ω2 rolloff.
The scaling law...
Modeling of the deformation of a liquid droplet impinging upon a flat surface
Tập 5 Số 11 - Trang 2588-2599 - 1993
This article presents a theoretical study of the deformation of a spherical
liquid droplet impinging upon a flat surface. The study accounts for the
presence of surface tension during the spreading process. The theoretical model
is solved numerically utilizing deforming finite elements and grid generation to
simulate accurately the large deformations, as well as the domain
nonuniformities characte...
Local energy transfer and nonlocal interactions in homogeneous, isotropic turbulence
Tập 2 Số 3 - Trang 413-426 - 1990
Detailed computations were made of energy transfer among the scales of motion in
incompressible turbulent fields at low Reynolds numbers generated by direct
numerical simulations. It was observed that although the transfer resulted from
triad interactions that were nonlocal in k space, the energy always transferred
locally. The energy transfer calculated from the eddy-damped quasinormal
Markovian ...