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Implications of Shallow Water in Numerical Simulations of a Surface Effect Ship

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dc.contributor.authorLyons, David Geoffreyen
dc.contributor.committeechairNeu, Wayne L.en
dc.contributor.committeememberMcCue-Weil, Leigh S.en
dc.contributor.committeememberBrown, Alan J.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2015-05-23T08:03:22Zen
dc.date.available2015-05-23T08:03:22Zen
dc.date.issued2014-10-15en
dc.description.abstractOverset, or Chimera, meshes are used to discretize the governing equations within a computational domain using multiple meshes that overlap in an arbitrary manner. The overset meshing technique is most applicable to problems dealing with multiple or moving bodies. Deep water simulations were carried out using both single and overset grid techniques for the evaluation of the overset grid application. These simulations were carried out using the commercial CFD code STAR-CCM+ by CD-adapco. The geometry simulated is that of a SES model (T-Craft) tested at the Naval Surface Warfare Center Carderock Division. The craft is simulated with two degrees of freedom, allowing movement in heave and pitch in response to displacement of the free surface. Agreement between the single and overset grid techniques was deemed reasonable to extend to future shallow water cases. However, due to longer run times of the overset mesh, the traditional or single mesh technique should be employed whenever applicable. In order to extend existing full craft CFD simulations of a surface effect ship (SES) into shallow water and maneuvering cases, an overset mesh is needed. Simulations of the SES were performed and monitored at various depth Froude numbers resulting in subcritical, critical, and supercritical flow regimes. Resistance, pitch response, and free surface response of the SES were compared between the shallow water simulations. The SES produced wider wakes, perpendicular to the craft, at simulations closer to the critical flow regime. Critical flow occurs at a depth Froude number between 0.9 and 0.95. Progression of shallow water effects through the three flow regimes agrees well with shallow water theory.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:3830en
dc.identifier.urihttp://hdl.handle.net/10919/52558en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSESen
dc.subjectOverset Meshen
dc.subjectShallow Wateren
dc.subjectDepth Froude Numberen
dc.titleImplications of Shallow Water in Numerical Simulations of a Surface Effect Shipen
dc.typeThesisen
thesis.degree.disciplineOcean Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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