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Effect of wall roughness on velocity distribution in channel flow : relation between the vortex pattern in roughness groove and flow pattern over the rough wall

Technology reports of the Yamaguchi University Volume 4 Issue 5 Page 345-356
published_at 1991-12
KJ00004351137.pdf
[fulltext] 540 KB
Title
Effect of wall roughness on velocity distribution in channel flow : relation between the vortex pattern in roughness groove and flow pattern over the rough wall
Creators Nakanishi Suketsugu
Creators Osaka Hideo
Source Identifiers
The present paper was concerned with a part of series of the numerical study on the flow in a two-dimensional rough wall channel by authors. On the flow through a two-dimensional channel with repeated squre ribs, the Navier-Stokes equations were solved by the finite difference method. The several flow cases for the pitch ratio W/h=2~11 (W and h denote the roughness spacing and height, respectively) and the Reynolds number Re=5~3000 were calculated. In order to reserach the effect of wall roughness on the flow pattern over the rough wall surface, the velocity distributions were presented in this paper. As the results, the velocity distribution near the wall showed the periodic flow pattern in the similitude of roughness geometry, and its flow pattern became indistinct with increasing the distance from the wall surface. The distance from the wall surface to the location of indistinct periodic flow pattern depended on both the pitch ratio and the Reynolds number. It was noticeable results that the vortex pattern in the roughness groove was closely related with this distance of indistinct periodic flow pattern.
Subjects
工学 ( Other)
Languages eng
Resource Type departmental bulletin paper
Publishers 山口大学工学部
Date Issued 1991-12
File Version Version of Record
Access Rights open access
Relations
[ISSN]0386-3433
[NCID]AA0086073X
Schools 工学部