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Velocity and vorticity measurements ...

Maher, Matthew C.

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Velocity and vorticity measurements in the atmospheric boundary layer.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Velocity and vorticity measurements in the atmospheric boundary layer./
Author:	Maher, Matthew C.
Description:	174 p.
Notes:	Source: Masters Abstracts International, Volume: 41-02, page: 0608.
Contained By:	Masters Abstracts International41-02.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1410702
ISBN:	0493834486

Velocity and vorticity measurements in the atmospheric boundary layer.
Maher, Matthew C.

Velocity and vorticity measurements in the atmospheric boundary layer. - 174 p.

Source: Masters Abstracts International, Volume: 41-02, page: 0608.

Thesis (M.S.)--Michigan State University, 2002.

Velocity and vorticity time series were measured in the near wall region of an atmospheric boundary layer. The measurements were acquired at the SLTEST site located in western Utah under thermally unstable, thermally stable, and thermally neutral ambient conditions. The surface was nearly flat and free of vegetation with a small scale surface roughness of approximately 2mm. The measurements were acquired at locations of 20cm and 40cm from the wall (<italic> y</italic><super>+</super> = 3800 and <italic>y</italic><super>+</super> = 10, 300 respectively). The Reynolds number based on momentum thickness was approximately <italic>Re</italic>&thetas; ≈ 5 × 10<super> 6</super> with a boundary layer thickness of approximately 200m.

ISBN: 0493834486Subjects--Topical Terms:

783786
Engineering, Mechanical.

Velocity and vorticity measurements in the atmospheric boundary layer.
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008 130610s2002 eng d
020 $a 0493834486
035 $a (UnM)AAI1410702
035 $a AAI1410702
040 $a UnM $c UnM
100 1 $a Maher, Matthew C. $3 1899808
245 1 0 $a Velocity and vorticity measurements in the atmospheric boundary layer.
300 $a 174 p.
500 $a Source: Masters Abstracts International, Volume: 41-02, page: 0608.
500 $a Adviser: John Foss.
502 $a Thesis (M.S.)--Michigan State University, 2002.
520 $a Velocity and vorticity time series were measured in the near wall region of an atmospheric boundary layer. The measurements were acquired at the SLTEST site located in western Utah under thermally unstable, thermally stable, and thermally neutral ambient conditions. The surface was nearly flat and free of vegetation with a small scale surface roughness of approximately 2mm. The measurements were acquired at locations of 20cm and 40cm from the wall (<italic> y</italic><super>+</super> = 3800 and <italic>y</italic><super>+</super> = 10, 300 respectively). The Reynolds number based on momentum thickness was approximately <italic>Re</italic>&thetas; ≈ 5 × 10<super> 6</super> with a boundary layer thickness of approximately 200m.
520 $a The vorticity measurements indicated an extremely long correlation time of the near wall vorticity field. For example, the first zero of the autocorrelation of the spanwise vorticity component was found to be as large as 40m. The first zero of the wall normal vorticity autocorrelation was found to be as large as 220m. The gradient of the Reynolds shear stress was also investigated by measurement of the two contributing velocity-vorticity products (<math> <f> <ovl><g>n</g>′<g>w</g><hsp sp="0.167"><hsp sp="0.167"> <hsp sp="0.167"><hsp sp="0.167">′<inf>z</inf></ovl> </f> </math> and <math> <f> <ovl>w′<g>w</g><hsp sp="0.167"><hsp sp="0.167"> <hsp sp="0.167"><hsp sp="0.167">′<inf>y</inf></ovl> </f> </math>). The <math> <f> <ovl>w′<g>w</g><hsp sp="0.167"><hsp sp="0.167"> <hsp sp="0.167"><hsp sp="0.167">′<inf>y</inf></ovl> </f> </math> product appeared to produce the dominant contribution to this gradient. Coherence spectral observations show that the relatively high wavenumber components produce the relatively large correlation (≈0.2) between the lateral velocity fluctuations and the wall normal vorticity fluctuations.
590 $a School code: 0128.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Atmospheric Science. $3 1019431
690 $a 0548
690 $a 0608
710 2 0 $a Michigan State University. $3 676168
773 0 $t Masters Abstracts International $g 41-02.
790 1 0 $a Foss, John, $e advisor
790 $a 0128
791 $a M.S.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1410702