ReportDOI
Rough-Wall Turbulent Boundary Layers
TLDR
In this paper, the authors investigated the effect of roughness on the near-wall drag-producing turbulent structures and proposed control strategies to reduce momentum loss in rough-wall boundary layers.Abstract:
: The objective of this project is to improve our fundamental knowledge of turbulent flows over rough surfaces. Specifically, we hope to investigate the manner in which roughness affects the near-wall drag-producing turbulent structures, and to what extent surface roughness affects the outer part of rough-wall boundary layers. Ultimately we hope to use this knowledge to propose control strategies to reduce momentum loss in rough-wall boundary layers.read more
Citations
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Journal ArticleDOI
Two decades of urban climate research: a review of turbulence, exchanges of energy and water, and the urban heat island
TL;DR: In this article, the authors reviewed progress in urban climatology over the two decades since the first publication of the International Journal of Climatology (IJC) and highlighted the role of scale, heterogeneity, dynamic source areas for turbulent fluxes and the complexity introduced by the roughness sublayer over the tall, rigid roughness elements of cities.
Journal ArticleDOI
Direct numerical simulations of turbulent channel flow with transverse square bars on one wall
TL;DR: In this article, direct numerical simulations have been carried out for a fully developed turbulent channel flow with a smooth upper wall and a lower wall consisting of square bars separated by a rectangular cavity.
Journal ArticleDOI
The influence of wall permeability on turbulent channel flow
TL;DR: In this article, the influence of wall permeability on the structure and dynamics of turbulent flow in a plane channel with a solid top wall and a permeable bottom wall is studied by means of volume-averaged Navier-Stokes equations.
Journal ArticleDOI
Experimental support for Townsend’s Reynolds number similarity hypothesis on rough walls
TL;DR: In this paper, the boundary layers on the rough walls were in the fully rough flow regime (k+⩾100) with the ratio of the boundary layer thickness to the equivalent sand roughness height greater than 40.
References
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Journal ArticleDOI
Two decades of urban climate research: a review of turbulence, exchanges of energy and water, and the urban heat island
TL;DR: In this article, the authors reviewed progress in urban climatology over the two decades since the first publication of the International Journal of Climatology (IJC) and highlighted the role of scale, heterogeneity, dynamic source areas for turbulent fluxes and the complexity introduced by the roughness sublayer over the tall, rigid roughness elements of cities.
Journal ArticleDOI
Direct numerical simulations of turbulent channel flow with transverse square bars on one wall
TL;DR: In this article, direct numerical simulations have been carried out for a fully developed turbulent channel flow with a smooth upper wall and a lower wall consisting of square bars separated by a rectangular cavity.
Journal ArticleDOI
The influence of wall permeability on turbulent channel flow
TL;DR: In this article, the influence of wall permeability on the structure and dynamics of turbulent flow in a plane channel with a solid top wall and a permeable bottom wall is studied by means of volume-averaged Navier-Stokes equations.
Journal ArticleDOI
The rough-wall turbulent boundary layer from the hydraulically smooth to the fully rough regime
TL;DR: In this paper, the root-mean-square roughness height was at least three orders of magnitude smaller than the boundary-layer thickness, and the Karman number was as high as 10100.
Journal ArticleDOI
Experimental support for Townsend’s Reynolds number similarity hypothesis on rough walls
TL;DR: In this paper, the boundary layers on the rough walls were in the fully rough flow regime (k+⩾100) with the ratio of the boundary layer thickness to the equivalent sand roughness height greater than 40.