Numerical Simulation of Surface Effect Ship Air Cushion and Free Surface Interaction

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dc.contributor.authorDonnelly, David Johnsonen
dc.contributor.committeechairNeu, Wayne L.en
dc.contributor.committeememberBrown, Alan J.en
dc.contributor.committeememberMcCue-Weil, Leigh S.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2014-03-14T20:46:28Zen
dc.date.adate2010-11-10en
dc.date.available2014-03-14T20:46:28Zen
dc.date.issued2010-09-08en
dc.date.rdate2010-11-10en
dc.date.sdate2010-10-07en
dc.description.abstractThis thesis presents the results from the computational fluid dynamics simulations of surface effect ship model tests. The model tests being simulated are of a generic T-Craft model running in calm seas through a range of Froude numbers and in two head seas cases with regular waves. Simulations were created using CD-adapco's STAR-CCM+ and feature incompressible water, compressible air, pitch and heave degrees of freedom, and the volume of fluid interface-capturing scheme. The seals are represented with rigid approximations and the air cushion fans are modeled using constant momentum sources. Drag data, cushion pressure data, and free surface elevation contours are presented for the calm seas cases while drag, pressure, heave, and roll data are presented for the head seas cases. The calm seas cases are modeled both with no viscosity and with viscosity and turbulence. All simulations returned rather accurate estimations of the free surface response, ship motions, and body forces. The largest source of error is believed to be due to the rigid seal approximations. While the wake's amplitude is smaller when viscosity is neglected, both viscous and inviscid simulations' estimations of the free surface qualitatively match video footage from the model tests. It was found that shear drag accounts for about a quarter of the total drag in the model test simulations with viscosity, which is a large source of error in inviscid simulations. Adding the shear drag calculated using the ITTC-1957 friction coefficient line to the total drag from the inviscid simulation gives the total drag from the viscous simulations within a 6% difference.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-10072010-105024en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10072010-105024/en
dc.identifier.urihttp://hdl.handle.net/10919/35326en
dc.publisherVirginia Techen
dc.relation.haspartDonnelly_DJ_T_2010.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectVolume of Fluiden
dc.subjectComputational fluid dynamicsen
dc.subjectT-Craften
dc.subjectSurface Effect Shipen
dc.subjectAir Cushionen
dc.subjectFree Surfaceen
dc.titleNumerical Simulation of Surface Effect Ship Air Cushion and Free Surface Interactionen
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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