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Auteur M.R. Raupach
Documents disponibles écrits par cet auteur
Faire une suggestion Affiner la rechercheA wind-tunnel study of turbulent flow close to regularly arrayed rough surfaces / M.R. Raupach
Titre : A wind-tunnel study of turbulent flow close to regularly arrayed rough surfaces Type de document : articles et extraits Auteurs : M.R. Raupach, Auteur ; I. Edwards, Auteur ; A. S. Thom, Auteur Année de publication : 1980 Importance : p.373-397 Langues : Français (fre) Résumé : The paper describes a wind-tunnel study undertaken to examine the height of a roughness sublayer and the properties of a mean velocity field within it. Theoretical problems are first treated, and an experimental arrangement and measurement data are then considered. Two purely mechanical surface influences are identified: wake diffusion and horizontal inhomogeneity.
A wind-tunnel study of turbulent flow close to regularly arrayed rough surfaces [articles et extraits] / M.R. Raupach, Auteur ; I. Edwards, Auteur ; A. S. Thom, Auteur . - 1980 . - p.373-397.
Langues : Français (fre)
Résumé : The paper describes a wind-tunnel study undertaken to examine the height of a roughness sublayer and the properties of a mean velocity field within it. Theoretical problems are first treated, and an experimental arrangement and measurement data are then considered. Two purely mechanical surface influences are identified: wake diffusion and horizontal inhomogeneity.
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Code-barres Cote Support Localisation Section Disponibilité ART-8857-0 ART Document imprimé Bureau chercheur Bureau de PIETRI Laurence Disponible Boundary-Layer Meteorology, Vol.22 No.1. Averaging procedures for flow within vegetation canopies / M.R. Raupach
in Boundary layer meteorology
Titre de série : Boundary-Layer Meteorology, Vol.22 No.1 Titre : Averaging procedures for flow within vegetation canopies Type de document : articles et extraits Auteurs : M.R. Raupach, Auteur ; Roger H. Shaw, Auteur Année de publication : 1982 Importance : p.79-90 ISBN/ISSN/EAN : 0006-8314 Langues : Français (fre) Résumé : Two averaging schemes are considered: pure horizontal averaging at a single instant, and time averaging followed by horizontal averaging. These schemes produce different forms for the mean and turbulent kinetic energy balances, and especially for the `wake production' term describing the transfer of energy from large-scale motion to wake turbulence by form drag. The differences are primarily due to the appearance, in the covariances produced by the second scheme, of dispersive components arising from the spatial correlation of time-averaged flow variables. The two schemes are shown to coincide if these dispersive fluxes vanish.
in Boundary layer meteorology
Boundary-Layer Meteorology, Vol.22 No.1. Averaging procedures for flow within vegetation canopies [articles et extraits] / M.R. Raupach, Auteur ; Roger H. Shaw, Auteur . - 1982 . - p.79-90.
ISSN : 0006-8314
Langues : Français (fre)
Résumé : Two averaging schemes are considered: pure horizontal averaging at a single instant, and time averaging followed by horizontal averaging. These schemes produce different forms for the mean and turbulent kinetic energy balances, and especially for the `wake production' term describing the transfer of energy from large-scale motion to wake turbulence by form drag. The differences are primarily due to the appearance, in the covariances produced by the second scheme, of dispersive components arising from the spatial correlation of time-averaged flow variables. The two schemes are shown to coincide if these dispersive fluxes vanish.
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Code-barres Cote Support Localisation Section Disponibilité ART-7297-0 ART Document imprimé Bureau chercheur Bureau de PIETRI Laurence Disponible Boundary-Layer Meteorology, Vol.71 No.1-2. Simplified expressions for vegetation roughness length and zero-plane displacement as functions of canopy height and area index / M.R. Raupach
in Boundary layer meteorology
Titre de série : Boundary-Layer Meteorology, Vol.71 No.1-2 Titre : Simplified expressions for vegetation roughness length and zero-plane displacement as functions of canopy height and area index Type de document : articles et extraits Auteurs : M.R. Raupach, Auteur Année de publication : 1994 Importance : p.211-216 Langues : Français (fre)
in Boundary layer meteorology
Boundary-Layer Meteorology, Vol.71 No.1-2. Simplified expressions for vegetation roughness length and zero-plane displacement as functions of canopy height and area index [articles et extraits] / M.R. Raupach, Auteur . - 1994 . - p.211-216.
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Code-barres Cote Support Localisation Section Disponibilité ART-8852-0 ART Document imprimé Bureau chercheur Bureau de PIETRI Laurence Disponible Boundary-Layer Meteorology, Vol.78 No.3-4. Coherent eddies and turbulence in vegetation canopies : the mixing layer analogy / M.R. Raupach
in Boundary layer meteorology
Titre de série : Boundary-Layer Meteorology, Vol.78 No.3-4 Titre : Coherent eddies and turbulence in vegetation canopies : the mixing layer analogy Type de document : articles et extraits Auteurs : M.R. Raupach, Auteur ; Y. Brunet, Auteur ; J. J. Finnigan, Auteur Année de publication : 1996 Importance : p.351-382 ISBN/ISSN/EAN : 0006-8314 Langues : Français (fre) Résumé : This paper argues that the active turbulence and coherent motions near the top of a vegetation canopy are patterned on a plane mixing layer, because of instabilities associated with the characteristic strong inflection in the mean velocity profile. Mixing-layer turbulence, formed around the inflectional mean velocity profile which develops between two coflowing streams of different velocities, differs in several ways from turbulence in a surface layer. Through these differences, the mixing-layer analogy provides an explanation for many of the observed distinctive features of canopy turbulence. These include: (a) ratios between components of the Reynolds stress tensor; (b) the ratio K K of the eddy diffusivities for heat and momentum; (c) the relative roles of ejections and sweeps; (d) the behaviour of the turbulent energy balance, particularly the major role of turbulent transport; and (e) the behaviour of the turbulent length scales of the active coherent motions (the dominant eddies responsible for vertical transfer near the top of the canopy).It is predicted that these length scales are controlled by the shear length scale L = U(h) U'(h) (where h is canopy height, U (z) is mean velocity as a function of height z, and U' = dU dz). In particular, the streamwise spacing of the dominant canopy eddies is = mLs, with m = 8.1. These predictions are tested against many sets of field and wind-tunnel data. We propose a picture of canopy turbulence in which eddies associated with inflectional instabilities are modulated by larger-scale, inactive turbulence, which is quasi-horizontal on the scale of the canopy.
in Boundary layer meteorology
Boundary-Layer Meteorology, Vol.78 No.3-4. Coherent eddies and turbulence in vegetation canopies : the mixing layer analogy [articles et extraits] / M.R. Raupach, Auteur ; Y. Brunet, Auteur ; J. J. Finnigan, Auteur . - 1996 . - p.351-382.
ISSN : 0006-8314
Langues : Français (fre)
Résumé : This paper argues that the active turbulence and coherent motions near the top of a vegetation canopy are patterned on a plane mixing layer, because of instabilities associated with the characteristic strong inflection in the mean velocity profile. Mixing-layer turbulence, formed around the inflectional mean velocity profile which develops between two coflowing streams of different velocities, differs in several ways from turbulence in a surface layer. Through these differences, the mixing-layer analogy provides an explanation for many of the observed distinctive features of canopy turbulence. These include: (a) ratios between components of the Reynolds stress tensor; (b) the ratio K K of the eddy diffusivities for heat and momentum; (c) the relative roles of ejections and sweeps; (d) the behaviour of the turbulent energy balance, particularly the major role of turbulent transport; and (e) the behaviour of the turbulent length scales of the active coherent motions (the dominant eddies responsible for vertical transfer near the top of the canopy).It is predicted that these length scales are controlled by the shear length scale L = U(h) U'(h) (where h is canopy height, U (z) is mean velocity as a function of height z, and U' = dU dz). In particular, the streamwise spacing of the dominant canopy eddies is = mLs, with m = 8.1. These predictions are tested against many sets of field and wind-tunnel data. We propose a picture of canopy turbulence in which eddies associated with inflectional instabilities are modulated by larger-scale, inactive turbulence, which is quasi-horizontal on the scale of the canopy.
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Code-barres Cote Support Localisation Section Disponibilité ART-6793-0 ART Document imprimé Bureau chercheur Bureau de ANSELMET, Fabien Disponible