Open-loop and Closed-loop control of a Flow over a Cluster of Three Cylinders with Variable Spin Rate in Equilateral Triangular Arrangement

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dc.contributor.advisorMartinuzzi, Robert John
dc.contributor.authorZhong, Xiao Peng
dc.contributor.committeememberMorton, Chris R.
dc.contributor.committeememberLi, Simon
dc.contributor.committeememberNowicki, Edwin Peter
dc.date2020-06
dc.date.accessioned2020-02-03T17:22:38Z
dc.date.available2020-02-03T17:22:38Z
dc.date.issued2020-01-30
dc.description.abstractThe control of the flow over a cluster of three rotating cylinders arranged in a triangular configuration (pinball-configuration) is simulated using 2D URANS. The free stream flow impinges onto the front cylinder at Reynolds number of 2054 based on the diameter. Open-loop and closed-loop controls change the flow behavior because the rotating surfaces of the cylinders directly modify the vorticity flux into the wake. For the open-loop control, the leeward cylinders are counter-rotating at a constant rate. In the open-loop control, the strength of the shear layers from the leeward cylinders and the central gap flow change and even reverse as the rotation rate varies. As a result, different and unique flow states were realized. The fluctuation of the flow reaches a minimum at certain rotation ratio (angular velocity of a cylinder non-dimensionalized by free-stream flow velocity). In the closed-loop control, the fluctuating lift of each cylinder is used as a feedback signal to control an oscillatory rotation rate about the mean that is set to match an open-loop configuration. The physical model describing the rotation-induced-lift by oscillatory rotation is developed and reveals a phase lag between 0 to pi from the steady-state-lift. Based on this mechanism, a closed-loop controller is designed such that the rotation-induced-lift partially cancels the lift from the natural vortex shedding. This results in lift attenuation. The closed-loop control is tested on the single cylinder case, revealing that the shear layers are elongated and the strength of the vorticity flux across each shear layer is reduced. The closed-loop control is then applied to the pinball-configuration. The same elongation of the shear layers and the reduction in the strength of vorticity flux are observed. Additionally, the closed-loop control changes the central gap flow, which slightly shifts the flow characteristics accordingly.en_US
dc.identifier.citationZhong, X. P. (2020). Open-loop and Closed-loop control of a Flow over a Cluster of Three Cylinders with Variable Spin Rate in Equilateral Triangular Arrangement (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/37547
dc.identifier.urihttp://hdl.handle.net/1880/111609
dc.language.isoengen_US
dc.publisher.facultySchulich School of Engineeringen_US
dc.publisher.institutionUniversity of Calgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.subjectrotating cylinderen_US
dc.subjectvortex interactionen_US
dc.subjectflow controlen_US
dc.subjectclosed loopen_US
dc.subjectopen loopen_US
dc.subjectvortex sheddingen_US
dc.subjectvortex mergeren_US
dc.subjectbluff bodiesen_US
dc.subjectgap flowen_US
dc.subjectMagnusen_US
dc.subjectCoandaen_US
dc.subjectpotential flowen_US
dc.subjectinduced vortexen_US
dc.subjectinduced liften_US
dc.subjectphase delayen_US
dc.subjectphase lagen_US
dc.subjectpinballen_US
dc.subjectcluster of cylindersen_US
dc.subjectshear layeren_US
dc.subjectshear layer interferenceen_US
dc.subjectshear layer interactionen_US
dc.subjectblowingen_US
dc.subjectsuctionen_US
dc.subjectoscillatory rotationen_US
dc.subjectvorticity fluxen_US
dc.subjectCFDen_US
dc.subjectURANSen_US
dc.subjectadaptive meshen_US
dc.subjectlift attenuationen_US
dc.subject.classificationPhysicsen_US
dc.subject.classificationFluid and Plasmaen_US
dc.subject.classificationApplied Sciencesen_US
dc.subject.classificationEnergyen_US
dc.subject.classificationEngineeringen_US
dc.subject.classificationEngineering--Mechanicalen_US
dc.titleOpen-loop and Closed-loop control of a Flow over a Cluster of Three Cylinders with Variable Spin Rate in Equilateral Triangular Arrangementen_US
dc.typemaster thesisen_US
thesis.degree.disciplineEngineering – Mechanical & Manufacturingen_US
thesis.degree.grantorUniversity of Calgaryen_US
thesis.degree.nameMaster of Science (MSc)en_US
ucalgary.item.requestcopytrueen_US
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