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Application of large-scale particle image velocimetry to entrance flows

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dc.contributor.authorFakhri, Alireza, author
dc.contributor.authorEttema, Robert, advisor
dc.contributor.authorThornton, Christopher, committee member
dc.contributor.authorBond, Laurel, committee member
dc.date.accessioned2021-06-07T10:19:53Z
dc.date.available2021-06-07T10:19:53Z
dc.date.issued2021
dc.description.abstractThis thesis presents the findings of the application of Large-Scale Image Velocimetry (LSPIV) to illuminate three entrance flows. LSPIV is an image-based method that non-invasively measures two-dimensional instantaneous free-surface velocities of water flow using video equipment. Three different applications used in this study are a flume study with three different contraction ratios, flow through and over spillways in hydraulic models for Gross Dam and Los Vaqueros Dams. For the first application, large-scale-particle velocimetry (LSPIV) was applied to estimate the top-width of the vena contracta formed by an approach open-channel flow entering a contraction of the channel. The experiments investigated the requisite dimensions of two essential LSPIV components: the Search Area and Interrogation Area, to establish the optimum range of these components for use in LSPIV application to contractions of open-channel flows. Of practical concern (e.g., bridge hydraulics) is flow contraction and contraction scour that can occur in the vena contracta region. The thesis showed that optimum values for the Search Area (SA) and Interrogation Area (IA) were 10 and 60 pixels, respectively. Also, the study produced a curve indicating a trend for vena-contracta width narrowing with a variable ratio of approach-channel and contracted-channel widths and varying bed shear stress of approach flow. For the other two applications, the hydraulic models of the spillways for Gross Dam and Los Vaqueros Dam, LSPIV was applied to assess the robustness of LSPIV on mapping the streamlines through and over spillways.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierFakhri_colostate_0053N_16501.pdf
dc.identifier.urihttps://hdl.handle.net/10217/232504
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2020-
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.subjectinterrogation area
dc.subjectLSPIV parameters
dc.subjectvena contracta width
dc.subjectLSPIV
dc.subjectcontracted open channels
dc.subjectsearch area
dc.titleApplication of large-scale particle image velocimetry to entrance flows
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineCivil and Environmental Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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