This 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. / Master of Science / This 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.
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/82531 |
| Date | 20 March 2018 |
| Creators | Mathew, Ajai Kurian |
| Contributors | Aerospace and Ocean Engineering, Brown, Alan J., Canfield, Robert A., Wang, Kevin Guanyuan |
| Publisher | Virginia Tech |
| Source Sets | Virginia Tech Theses and Dissertation |
| Detected Language | English |
| Type | Thesis |
| Format | ETD, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
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