DescriptionNavy Enhanced Sierra Mechanics (NESM) builds on and enhances the DOE Sandia National Laboratory Sierra Mechanics software suite to enable assessment of ship structure and component response to weapons loading using physics-based, massively parallel, high performance computational tools. NESM is used to predict both ship shock response and structural damage, including severe cases. The NESM toolkit supports an evolving Navy process to reduce risk and cost associated with full ship shock testing. The toolkit is positioned to improve initial ship design processes by providing shock and associated equipment vulnerability assessment prior to final arrangement and installations decisions. The tightly coupled multi-physics capabilities include: structural dynamics, solid mechanics, fluid dynamics, fluid-structure interaction, and shock physics. The HPC capability enables engineers to address full-scale naval vessels including next generation aircraft carriers and submarines.
NavyFOAM, based on OpenFOAM, has been tailored specifically to simulate the air-sea interface, seaway loading, propulsor-hull interactions, and other hydrodynamic effects important for naval vessels. It has been extensively validated for underwater vehicles and surface ships based upon experimental data and ship trials information. It has been applied to many different naval systems to gain physical insights into complex flow phenomena and to guide and support physical model testing. NavyFOAM reduces design risk by leveraging HPC resources with high-fidelity physics prediction capabilities to address complex ship design questions and characterize complex ship performance earlier in the design cycle.
Examples of how NavyFOAM and NESM support workflows to enhance physical understanding and reduce physical testing requirements will be presented.