Results 161 to 170 of about 471 (203)

Westerly jet waviness modulates mid-latitude hydroclimate variability. [PDF]

Nat Commun
Cheng L, Zhang J, Wu Y, Cheng J, Yi L, Zhang Z, Long H.   +6 more
europepmc   +1 more source

Compound effects of dams and levees reshape Yangtze flood dynamics and reveal substantial risk misestimations from ignoring levees. [PDF]

Sci Rep
Xu S, Sun H, Zhang L, Han J, Pan R, Yang L, Xiang X, Tang L.   +7 more
europepmc   +1 more source

Fire Inside the Cavity of a Non-flammable Facade: Step-by-Step Development of Multiphysics Computer Simulations. [PDF]

Fire Technol
Khoo B, Jahn W, Bonner M, Kotsovinos P, Rein G.   +4 more
europepmc   +1 more source

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Subgrid‐scale modeling with a variable length scale

Physics of Fluids A, Fluid Dynamics, 1989
Length scale variation in subgrid-scale (SGS) modeling is studied using the results from a two-scale direct-interaction approximation. The length scale variation is generated by the advection of SGS eddies by grid-scale ones. This effect leads to the variation of a characteristic SGS length scale around the filter width in the Smagorinsky model.
Yoshizawa Akira
exaly   +2 more sources

Direct testing of subgrid-scale models

17th Aerospace Sciences Meeting, 1979
Results are given from a study in which models used in large-eddy simulation of turbulent flow are tested using results of exact simulations of the Navier-Stokes equations. The results to date are for models of the eddyviscosity type applied to incompressibl e homogeneous turbulence (either isotropic or in the presence of applied irrotational plane ...
O. J. McMillan, J. H. Ferziger
openaire   +1 more source

Filtered subgrid-scale models

Physics of Fluids, 2000
Filtered subgrid-scale models are derived, which are less sensitive to the low-frequency modes than their original counterparts. They are obtained thanks to the definition of a high-pass discrete test filter. After presenting the theoretical derivation of these models, some a posteriori tests on the incompressible channel flow case are presented.
Sagaut, P., Comte, P., Ducros, F.
openaire   +2 more sources

Subgrid-Scale modeling

EAS Publications Series, 2006
The purpose of this lecture is to give an overview of the subgrid scale models used for Large Eddy Simulations (LES). The first models where essentially eddy-viscosity models, where the turbulent viscosity coefficient was found by simple dimensional considerations (the mixing length theory) or taking into account Kolmogorov theory ...
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The Subgrid-Scale Estimation Model

1999
The subgrid scale estimation procedure provides an estimate of unfiltered quantities appearing in the definitions of the subgrid-scale tensors and consists of two steps. In the deconvolution step an approximate inversion of the filtering operation is performed. Subsequently, the nonlinear step is used to generate a range of subgrid scales on a mesh two
J. Andrzej Domaradzki, Kuo-Chieh Loh
openaire   +1 more source

Subgrid-scale modelling in relaminarizing flows

Fluid Dynamics Research, 2010
The reversion of a turbulent flow to a laminar or quasi-laminar state may take very different paths, depending on the cause of the relaminarization; modelling these flows is quite difficult. Large-eddy simulations (LES) may be quite effective as the large, momentum-carrying eddies are accurately resolved; the unresolved, subgrid-scale (SGS) stresses ...
Ugo Piomelli, Carlo Scalo
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On the development of a subgrid scale clutter model

40th AIAA Aerospace Sciences Meeting & Exhibit, 2002
The objective of this research is to develop a subgrid scale model to account for the effects of small objects, or "clutter", that are difficult to resolve using a CFD mesh. These objects may range in size from being small relative to the grid (i.e. porous media limit) to scales, which are on the same order as the grid size (i.e.
P. DesJardin, J. Nelsen, L. Gritzo, T. Ghee   +3 more
openaire   +1 more source