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dc.contributor.authorMurzello, Rowayneen
dc.date.accessioned2019-05-31T19:35:36Z
dc.date.available2019-05-31T19:35:36Z
dc.identifier.urihttp://hdl.handle.net/1974/26265
dc.description.abstractThe geometric design of an axial-flow pit-turbine is essential as flow separation will decrease turbine efficiency. In this thesis, steady Reynolds Averaged Navier Stokes (RANS) simulations were conducted with a two-equation closure model and validated with experimental results. The research focuses on evaluating the performance of a k-omega Shear Stress Transport (SST) turbulence model with wall functions in separated flows. RANS simulations were carried out in OpenFOAM using an unstructured grid for both lab and full-scale models of the pit-turbine. By testing a lab-scale model, Particle Image Velocimetry (PIV) was performed to provide insights into the flow behaviour in regions of separation. It was observed that the pressure results from the lab and full-scale RANS models were in agreement with experimental data except in regions of an adverse pressure gradient. The k-omega SST model is sensitive to wall-functions and therefore flow properties near the wall are incorrectly calculated in regions of flow separation. At sharp streamline curvatures, the pressure drop is overpredicted for both the lab and full-scale models. However, at very large Reynolds numbers for the full-scale turbine, the turbulence model underpredicts and delays flow separation at a larger radius of curvature when compared to experiments.en
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectCFDen
dc.subjectRANSen
dc.subjectValidationen
dc.subjectOpenFOAMen
dc.subjectTurbineen
dc.subjectSimulationsen
dc.titleSimulations and validation of an axial-flow pit turbineen
dc.typethesisen
dc.description.degreeM.A.Sc.en
dc.contributor.supervisorRival, Daviden
dc.contributor.departmentMechanical and Materials Engineeringen
dc.degree.grantorQueen's University at Kingstonen


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