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dc.contributor.authorKlenow, Bradley A.en
dc.date.accessioned2014-03-14T21:36:35Zen
dc.date.available2014-03-14T21:36:35Zen
dc.date.issued2006-04-21en
dc.identifier.otheretd-05242006-113217en
dc.identifier.urihttp://hdl.handle.net/10919/42786en
dc.description.abstractThis thesis investigates the use of the numerical modeling tools LS-DYNA and USA in modeling general far-field underwater explosions (UNDEX) by modeling a three-dimensional box barge that is subjected to a far-field underwater explosion. Past UNDEX models using these tools have not been validated by experiment and most are limited to very specific problems because of the simplifying assumptions they make. USA is a boundary element code that requires only the structural model of the box barge. LS-DYNA is a dynamic finite element code and requires both the structural model and the surrounding fluid model, which is modeled with acoustic pressure elements. Analysis of the box barge problem results finds that the program USA is a valid tool for modeling the initial shock response of surface ships when cavitation effects are not considered. LS-DYNA models are found to be very dependent on the accuracy of the fluid mesh. The accuracy of the fluid mesh is determined by the ability of the mesh to adequately capture the peak pressure and discontinuity of the shock wave. The peak pressure captured by the model also determines the accuracy of the cavitation region captured in the fluid model. Assumptions made in the formulation of the fluid model causes potential inaccurate fluid-structure interaction and boundary condition problems cause further inaccuracies in the box barge model. These findings provide a base of knowledge for the current capabilities of UNDEX modeling in USA and LS-DYNA from which they can be improved in future work.en
dc.publisherVirginia Techen
dc.relation.haspartthesis_klenow_new.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectUSAen
dc.subjectshock captureen
dc.subjectnon-reflecting boundariesen
dc.subjectLS-DYNAen
dc.subjectUnderwater explosionen
dc.titleAssesment of LS-DYNA and Underwater Shock Analysis (USA) Tools for Modeling Far-Field Underwater Explosion Effects on Shipsen
dc.typeThesisen
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.description.degreeMaster of Scienceen
thesis.degree.nameMaster of Scienceen
thesis.degree.levelmastersen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineAerospace and Ocean Engineeringen
dc.contributor.committeechairBrown, Alan J.en
dc.contributor.committeememberHughes, Owen F.en
dc.contributor.committeememberKapania, Rakesh K.en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05242006-113217/en
dc.date.sdate2006-05-24en
dc.date.rdate2009-10-03en
dc.date.adate2006-10-03en


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