NDLI: LDA Measurements in Rough Surface ZPG Turbulent Boundary layers

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Brzek, Brian Cal, Rau´l Bayoa´n Johansson, Gunnar Castillo, Luciano
Copyright Year	2006
Abstract	A new set of experiments have been performed in order to study the effects of the upstream conditions and the surface roughness on a zero pressure gradient turbulent boundary layer. In order to properly capture the x-dependence of the single point statistics, consecutive measurements of 11 streamwise locations were performed. These 2-D Laser Doppler Anemometry (LDA) measurements enable us to use the full boundary layer equations in order to calculate the skin friction and determine the boundary layer development which is not possible in the majority of experiments on rough surfaces. It will be shown that for fixed experimental conditions (i.e., fixed upstream wind tunnel speed, trip wire, etc), the velocity deficit profiles collapse for each of the scalings investigated but only the Zagarola/Smits scaling (1998) could collapse all the different experimental conditions into a single curve. In addition, the Reynolds stresses were increasingly affected by the surface roughness as the roughness parameter, k+, increased. Moreover, it was found that the shape of the Reynolds stress profiles was very different throughout the entire boundary layer, particularly the < u2 > component. This is likely the result of the flow becoming more isotropic for increased k+, and will be seen in the anisotropy coefficients. Moreover, increased production of < u2 > and < uv > due to roughness is also seen throughout the entire boundary layer although its overall role in the changing shape of the < u2 > profiles still needs to be determined. The effect of roughness on the boundary layer parameters is also evident and their x-dependence is also shown.
Sponsorship	Fluids Engineering Division
Starting Page	993
Ending Page	1002
Page Count	10
File Format	PDF
ISBN	0791847519
DOI	10.1115/FEDSM2006-98508
e-ISBN	0791837831
Volume Number	Volume 2: Fora
Conference Proceedings	ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering
Language	English
Publisher Date	2006-07-17
Publisher Place	Miami, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Collapse Wind tunnels Statistics as topic Surface roughness Pressure gradient Wire Flow (dynamics) Stress Anisotropy Laser doppler anemometry Skin friction (fluid dynamics) Shapes Boundary layers Boundary layer turbulence
Content Type	Text
Resource Type	Article

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