File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Atmospheric turbulent boundary layer development due to a change in surface roughness

TitleAtmospheric turbulent boundary layer development due to a change in surface roughness
Authors
KeywordsBoundary layers
Friction
Interfaces (materials)
Shear stress
Stress analysis
Issue Date2001
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/ijengsci
Citation
International Journal of Engineering Science, 2001, v. 39 n. 17, p. 2001-2014 How to Cite?
AbstractThe turbulent wind flow passing from a surface of one roughness to another is investigated analytically. The wind flow is modelled by a deep atmospheric turbulent boundary layer that assumes the possibility of self-preserving development in the course of flow modification. Closed form solutions are obtained describing the entire flow development and the characteristics of the wind velocity, surface stress changes and frictional velocity changes. It is found that as the wind flows past the roughness discontinuity, the flow adapts to the new surface roughness through adjustment by a vertical displacement of streamlines. This leads to a change in boundary layer thickness and the length of the acceleration region, in which the adjustments depend obviously on the difference in roughness between the new and the original region. By including the effect of frictional velocity and higher-order terms, the theory also shows that a greatly different value of shear stress is possible in the new regime, as opposed to what Townsend [J. Fluid Mech. 26 (1966) 255] has predicted.
Persistent Identifierhttp://hdl.handle.net/10722/223707
ISSN
2015 Impact Factor: 3.165
2015 SCImago Journal Rankings: 1.916

 

DC FieldValueLanguage
dc.contributor.authorChan, AT-
dc.date.accessioned2016-03-09T04:36:04Z-
dc.date.available2016-03-09T04:36:04Z-
dc.date.issued2001-
dc.identifier.citationInternational Journal of Engineering Science, 2001, v. 39 n. 17, p. 2001-2014-
dc.identifier.issn0020-7225-
dc.identifier.urihttp://hdl.handle.net/10722/223707-
dc.description.abstractThe turbulent wind flow passing from a surface of one roughness to another is investigated analytically. The wind flow is modelled by a deep atmospheric turbulent boundary layer that assumes the possibility of self-preserving development in the course of flow modification. Closed form solutions are obtained describing the entire flow development and the characteristics of the wind velocity, surface stress changes and frictional velocity changes. It is found that as the wind flows past the roughness discontinuity, the flow adapts to the new surface roughness through adjustment by a vertical displacement of streamlines. This leads to a change in boundary layer thickness and the length of the acceleration region, in which the adjustments depend obviously on the difference in roughness between the new and the original region. By including the effect of frictional velocity and higher-order terms, the theory also shows that a greatly different value of shear stress is possible in the new regime, as opposed to what Townsend [J. Fluid Mech. 26 (1966) 255] has predicted.-
dc.languageeng-
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/ijengsci-
dc.relation.ispartofInternational Journal of Engineering Science-
dc.subjectBoundary layers-
dc.subjectFriction-
dc.subjectInterfaces (materials)-
dc.subjectShear stress-
dc.subjectStress analysis-
dc.titleAtmospheric turbulent boundary layer development due to a change in surface roughness-
dc.typeArticle-
dc.identifier.emailChan, AT: atchan@hkucc.hku.hk-
dc.identifier.doi10.1016/S0020-7225(01)00037-4-
dc.identifier.scopuseid_2-s2.0-0035502204-
dc.identifier.hkuros66588-
dc.identifier.volume39-
dc.identifier.issue17-
dc.identifier.spage2001-
dc.identifier.epage2014-
dc.publisher.placeAmsterdam, Netherlands-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats