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dc.contributor.authorOrtega Lopez, Miguel Darioen_US
dc.date.accessioned2009-06-05en_US
dc.date.accessioned2014-03-14T20:35:10Z
dc.date.available2014-03-14T20:35:10Z
dc.date.issued2009-04-24en_US
dc.identifier.otheretd-05052009-121041en_US
dc.identifier.urihttp://hdl.handle.net/10919/32236
dc.description.abstractIt is well known that for small Reynolds numbers, flow around a cylinder is laminar and stable. For larger Reynolds numbers, although the flow regime remains laminar, the formation of complex periodic structures appear downstream. The cyclic nature of this periodic flow is well characterized by the vortex shedding frequency and Strouhal number. However, complexities of these periodic structures downstream continue to be a topic of research. Periodic laminar 2D incompressible viscous flow around a cylinder is simulated using OpenFoam, an open source computational fluid dynamics program. To better understand these complex structures downstream, a customized computer graphical tool, VerFlow-V.01, was created to analyze and study OpenFoam simulation results. This study includes an investigation of calculating the details of drag and lift coefficients for the cylinder using mathematical models that integrate properties in subdomains, an approach not previously explored to the knowledge of the author. Numerical integration is accomplished using a finite difference approach for solving surface and contour integrals in subdomains of interest. Special attention is given to pressure and to the second invariant of the velocity gradient, as they have a clear mathematical relationship, which is consistent with results previously published. A customized visual data analysis tool, called VerFlow-V.01, allowed investigators to compare simulation data variables in a variety of useful ways, revealing details not previously understood. Main subroutines and a userâ s manual are included as appendices to encourage reproducibility and future development of the numerical, analytical and graphical models developed here. Together these models resulted in a new understanding of periodic laminar flow around a cylinder. A unique approach was developed to qualitatively understand the origins of drag and lift coefficients associated with properties mapped as images in subdomains of interest downstream. These results explain the development of convergent, eddy, and stream zones embedded in flow fields downstream.en_US
dc.publisherVirginia Techen_US
dc.relation.haspart01e_Exploring_and_Envisioning_Periodic_Laminar_Flow.pdfen_US
dc.relation.haspartA4.2_Rect_FS.moven_US
dc.relation.haspartA4.5_stagQLiftFull_FS.moven_US
dc.relation.haspartA4.6_StagVortVelVectors_FS.moven_US
dc.relation.haspartA4.4_stagQDragFull_FS.moven_US
dc.relation.haspartA4.1_Forces_FS.moven_US
dc.relation.haspartA4.3_EntireDomain_FS.moven_US
dc.relation.haspartA1.1_reverse_FS.wmven_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectqualitative analysisen_US
dc.subjectsecond invariant of the velocity gradienten_US
dc.titleExploring and Envisioning Periodic Laminar Flow Around a Cylinderen_US
dc.typeThesisen_US
dc.contributor.departmentEngineering Science and Mechanicsen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairKriz, Ronald D.en_US
dc.contributor.committeememberRagab, Saad A.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05052009-121041/en_US
dc.contributor.committeecochairDancey, Clinton L.en_US
dc.date.sdate2009-05-05en_US
dc.date.rdate2009-06-05


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