E) requirements for the lead ship of each new construction shock-hardened ship class. While those trials are necessary in order to evaluate the vunerability and survivability of the ship, they are very expensive, require extensive time for planing and coordination, and pose serious danger to the crew, ship and marine environment. Thus, computer modeling of the ship structure, surrounding fluid, and virtual shock environment by utilizing finite element method offers a valuable design tool and an alternative to these tests. This thesis investigates the response of a catamaran-hull ship subjected to an underwater explosion by creating a virtual UNDEX environment based on the modeling and simulation methodology established by the Shock and Vibration Computational Laboratory at the Naval Postgraduate School (NPS). In previous works, all of the structural models were monohull ships and there have been concerns about the feasibility of creating the coupled fluid and catamaran-hull model. This thesis studies the effect of an additional hull and gap between two hulls on the dynamic response of the ship as well as the effect of the charge location.
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