Abstract
NSWC PCD has developed a high-fidelity 3-D finite-element (FE) modeling system that computes acoustic color templates (target strength vs. frequency and aspect angle) of single or multiple realistic objects (e.g., target + clutter) in littoral environments. High-fidelity means that 3-D physics is used in all solids and fluids, including even thin shells, so that solutions include not only all propagating waves but also all evanescent waves, the latter critically affecting the former. Although novel modeling techniques have accelerated the code by several orders of magnitude, NSWC PCD is now implementing a radically different FE technology, e.g., one thin-shell element spanning 90° of a cylindrical shell. It preserves all the 3-D physics but promises to accelerate the code another two to three orders of magnitude. The talk will briefly review the existing system and then describe the new technology.
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