Vortex Ring Collision with Free-Slip and No-Slip Wall

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dc.contributor.advisorOstilla-Mónico, Rodolfo
dc.contributor.committeeMemberMetcalfe, Ralph W.
dc.contributor.committeeMemberAlba, Kamran
dc.creatorMishra, Aakash
dc.date.accessioned2020-01-04T01:46:09Z
dc.date.createdMay 2019
dc.date.issued2019-05
dc.date.submittedMay 2019
dc.date.updated2020-01-04T01:46:09Z
dc.description.abstractVortex ring collision on wall explains azimuthal instability, stretching, vorticity and wall turbulence in a simplified way, required in many applications. Present study performs high Reynolds number (2500 and 4000) simulations of vortex rings approaching no-slip and free-slip walls for different radius ratio (0.1, 0.2, 0.3, and 0.4). Structural and dynamic information, statistics on energy transfer and vortex stretching obtained using the simulations. Three-dimensional simulations helped to understand the mechanism of the formation of azimuthal instabilities and their dependence on Reynolds number and radius ratio, and verified that these instabilities influence the ejection velocity of the new ring, and the generation of small-scale turbulence. Interaction between a ring and a wall compared from that of a vortex pair collision. Axisymmetric simulations performed to help to verify whether the generation of small scales of the new vortex ring is due to azimuthal instabilities or other phenomena.
dc.description.departmentMechanical Engineering, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/10657/5738
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectVortex Rings
dc.subjectAzimuthal Instabilities
dc.subjectFilaments
dc.titleVortex Ring Collision with Free-Slip and No-Slip Wall
dc.type.dcmiText
dc.type.genreThesis
local.embargo.lift2021-05-01
local.embargo.terms2021-05-01
thesis.degree.collegeCullen College of Engineering
thesis.degree.departmentMechanical Engineering, Department of
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelMasters
thesis.degree.nameMaster of Science in Mechanical Engineering

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