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Three-dimensional turbulent boundary layer flow on roughness strip of finite width

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dc.contributor.authorEdling, Walter H., author
dc.contributor.authorCermak, J. E. (Jack E.), author
dc.contributor.authorFluid Dynamics and Diffusion Laboratory, Colorado State University, publisher
dc.date.accessioned2019-09-17T19:24:32Z
dc.date.available2019-09-17T19:24:32Z
dc.date.issued1974-04
dc.descriptionCER73-74WHE-JEC34.
dc.descriptionApril 1974.
dc.descriptionIncludes bibliographical references.
dc.descriptionPrepared under Office of Naval Research, Project No. NR 062-414/6-6-68 (Code 438), U.S. Department of Defense.
dc.description.abstractDescribed are the results of an experimental study of a well-developed, turbulent boundary layer on a smooth, flat surface encountering an area of much rougher surface. The roughened area is a strip with its length extending in the direction of the mean flow but of finite width in the surface direction normal to the flow. The resulting three-dimensional flow differs significantly from previously studied cases involving step changes in roughness of infinite extent in the direction normal to the flow. Extensive experiments were carried out in a wind tunnel having a length of nearly 100 ft. (30.5 m) with a boundary layer thickness of the order of 18-20 in. (0.5 m). Pitot tube and hot-wire anemometer measurements were made of mean velocity and Reynolds stress quantities in great detail throughout the flow field. Secondary flow components were measured by a new x-wire technique permitting quick resolution of very small deflections of the mean flow vector. Considerable effort was expended to reduce and examine sources of error. The data obtained is presented both graphically and in tabular form. Analysis of the three-dimensional, turbulent boundary layer equations is carried out using the experimental results to identify significant terms. Several conclusions are reached regarding the driving mechanism of the flow, the significant flow parameters, and the effects of the three-dimensionality upon the flow as compared to the analogous two-dimensional case.
dc.description.sponsorshipUnder Contract no. N00014-68-A-0493-0001.
dc.format.mediumtechnical reports
dc.identifier.urihttps://hdl.handle.net/10217/198115
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relationCatalog record number (MMS ID): 991012241119703361
dc.relation.ispartofCivil Engineering Reports
dc.relation.ispartofProject THEMIS technical report, no. 27
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subject.lcshBoundary layer
dc.subject.lcshLaminar flow
dc.subject.lcshFluid dynamics
dc.titleThree-dimensional turbulent boundary layer flow on roughness strip of finite width
dc.typeText
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