Numerical simulations of vortices near free and solid surfaces
dc.contributor.author | Luton, J. Alan | en |
dc.contributor.committeechair | Ragab, Saad A. | en |
dc.contributor.committeemember | Telionis, Demetri P. | en |
dc.contributor.committeemember | Mook, Dean T. | en |
dc.contributor.committeemember | Nayfeh, Ali H. | en |
dc.contributor.committeemember | Devenport, William J. | en |
dc.contributor.department | Engineering Mechanics | en |
dc.date.accessioned | 2014-03-14T21:20:21Z | en |
dc.date.adate | 2007-10-05 | en |
dc.date.available | 2014-03-14T21:20:21Z | en |
dc.date.issued | 1996-08-05 | en |
dc.date.rdate | 2007-10-05 | en |
dc.date.sdate | 2007-10-05 | en |
dc.description.abstract | The interaction of vortices passing near free and solid surfaces has been examined using direct numerical simulation (DNS). A computer code was developed which solves the unsteady, three-dimensional Navier-Stokes equations for incompressible flow. A critical element of the numerical scheme is the efficient solution of Poisson's equation. A state of the art solver based on multigrid techniques was developed which gives excellent convergence rates. The result is a tool capable of modeling complex three-dimensional flows in a variety of configurations. Three different flow fields have been examined in order to determine some of the complex interactions involved between a vortex and a surface. The first concerns the two-dimensional interaction between a boundary layer and a convecting vortex. The size and height above the wall of the vortex are the same order of magnitude as the boundary layer thickness. A strong primary vortex creates a secondary vortex which causes the rebound of the primary, a response observed in many previous studies. However, weaker vortices as well do not follow the inviscid trajectory despite the absence of a secondary vortex. Rather than creating vorticity at the wall, a weaker vortex mainly redistributes the vorticity of the boundary layer. The redistributed vorticity alters the path of the vortex in ways not seen for vortex/wall interactions. | en |
dc.description.degree | Ph. D. | en |
dc.format.extent | xiv, 178 leaves | en |
dc.format.medium | BTD | en |
dc.format.mimetype | application/pdf | en |
dc.identifier.other | etd-10052007-143040 | en |
dc.identifier.sourceurl | http://scholar.lib.vt.edu/theses/available/etd-10052007-143040/ | en |
dc.identifier.uri | http://hdl.handle.net/10919/39631 | en |
dc.language.iso | en | en |
dc.publisher | Virginia Tech | en |
dc.relation.haspart | LD5655.V856_1996.L886.pdf | en |
dc.relation.isformatof | OCLC# 35838395 | en |
dc.rights | In Copyright | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
dc.subject | short wavelength instability | en |
dc.subject | Crow instability | en |
dc.subject | vortex rebound | en |
dc.subject | multi-grid | en |
dc.subject | airplane wakes | en |
dc.subject.lcc | LD5655.V856 1996.L886 | en |
dc.title | Numerical simulations of vortices near free and solid surfaces | en |
dc.type | Dissertation | en |
dc.type.dcmitype | Text | en |
thesis.degree.discipline | Engineering Mechanics | en |
thesis.degree.grantor | Virginia Polytechnic Institute and State University | en |
thesis.degree.level | doctoral | en |
thesis.degree.name | Ph. D. | en |
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