Modeling Underwater Explosion (UNDEX) Shock Effects for Vulnerability Assessment in Early Stage Ship Design

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dc.contributor.authorMathew, Ajai Kurianen
dc.contributor.committeechairBrown, Alan J.en
dc.contributor.committeememberCanfield, Robert A.en
dc.contributor.committeememberWang, Kevin Guanyuanen
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2018-03-21T08:00:15Zen
dc.date.available2018-03-21T08:00:15Zen
dc.date.issued2018-03-20en
dc.description.abstractThis thesis describes and assesses a simplified tool for modeling underwater explosion shock effects during early naval ship concept design. A simplified fluid model using Taylor flat-plate theory is incorporated directly into the OpenFSI module code in Nastran and used to interface with the structural solver in Nastran to simulate a far-field shockwave impacting the hull. The kick-off velocities and the shock spectra captured in this computationally efficient module is compared to results from a high-fidelity CASE (Cavitating Acoustic Spectral Element) fluid model implemented with the ABAQUS/Nastran structural solver to validate the simplified framework and assess the sufficiency of this very simple but, fast approach for early stage ship design.en
dc.description.abstractgeneralThis thesis describes and assesses a simplified tool for modeling underwater explosion shock effects during early-stage naval ship design. Far-field explosions have a significant effect in terms of damage to equipment and mission capability of a ship. A simplified fluid-structure interaction model using the concept “Taylor flat-plate theory” is developed to simulate a far-field shockwave impacting the hull. This model is directly incorporated inside ‘OpenFSI’, a module used to couple an external code with the Nastran structural solver software. The initial peak velocity in the time-history and the shock spectra characteristics captured in this computationally efficient module is compared to results from a high-fidelity “CASE” (Cavitating Acoustic Spectral Element) fluid-structure interaction model. The “CASE” model implemented with the ABAQUS/Nastran structural solver is used to validate the simplified framework and assess the sufficiency of this very simple, but fast approach for early stage ship design.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:14488en
dc.identifier.urihttp://hdl.handle.net/10919/82531en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectUnderwater Explosionen
dc.subjectShocken
dc.subjectNaval Ship Designen
dc.titleModeling Underwater Explosion (UNDEX) Shock Effects for Vulnerability Assessment in Early Stage Ship Designen
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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