Assessment of Formulations for Numerical Solutions of Low Speed, Unsteady, Turbulent Flows over Bluff Bodies

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dc.contributor.authorCampioli, Theresa Lynnen
dc.contributor.committeechairSchetz, Joseph A.en
dc.contributor.committeememberDevenport, William J.en
dc.contributor.committeememberNeel, Reece E.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2014-03-14T20:34:53Zen
dc.date.adate2005-05-11en
dc.date.available2014-03-14T20:34:53Zen
dc.date.issued2005-04-28en
dc.date.rdate2006-05-11en
dc.date.sdate2005-05-03en
dc.description.abstractTwo algorithms commonly used for solving low-speed flow fields are evaluated using an unsteady turbulent flow formulation. The first algorithm is the method of artificial compressibility which solves the incompressible Navier-Stokes equations. The second is a preconditioned system for solving the compressible Navier-Stokes equations. Both algorithms have been implemented into GASP Version 4, which is the flow solver used in this investigation. Unsteady numerical simulations of unsteady, 2-D flow over square cylinders are performed with comparisons made to experimental data. Cases studied include both a single-cylinder and a three-cylinder configuration. Two turbulence models are also used in the computations, namely the Spalart-Allmaras model and the Wilcox k-ω (1998) model. The following output data was used for comparison: aerodynamic forces, mean pressure coefficient, Strouhal number, mean velocity magnitude and turbulence intensity. The main results can be summarized as follows. First, the predictions are more sensitive to the turbulence model choice than to the choice of algorithm. The Spalart-Allmaras model overall produced better results with both algorithms than the Wilcox k-ω model. Second, the artificial compressibility algorithm produced slightly more consistent results compared with experiment.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05032005-141534en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05032005-141534/en
dc.identifier.urihttp://hdl.handle.net/10919/32141en
dc.publisherVirginia Techen
dc.relation.haspartTLC_AOE_Masters.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectTurbulenceen
dc.subjectBluff Bodyen
dc.subjectunsteadyen
dc.subjectLow-Speeden
dc.subjectComputational fluid dynamicsen
dc.titleAssessment of Formulations for Numerical Solutions of Low Speed, Unsteady, Turbulent Flows over Bluff Bodiesen
dc.typeThesisen
thesis.degree.disciplineAerospace and Ocean Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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