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For ship hydrodynamics, a high-end RANS/CFD code is being developed to provide engineers with the capability to rigorously analyze alternative hull form designs with the confidence of model tests. Concurrent with this, an integrated hydrodynamics design environment is being developed to give ship designers easy and convenient access to software design-analysis tools to evaluate trad -eos (often involving thousands of design variables and high performance comput -ers) and make decisions early in the design process, when the impact on future cost is greatest. Improvement and condence Simulation capability for ship hydro -dynamics is steadily improving. While increasing computer power has helped drive this improvement, increased confi -dence in the results is equally important. That confidence stems from experience and demonstrated results. It is clear that computational simulation will play a larger role for design in the future. There is a strong desire to take a broader, more integrated approach to ship design early in the design cycle, when it is most cost- effective to change a design. An era is evolving when a large number of compu -tational studies could be performed for new hull forms, in some sense replacing the series tests of old. It is also expected that experimental model testing will be used less as a design tool, and more as a validation for the simulations and the final configuration. MTDr. Joseph Gorski is the head of the Computational Hydromechanics Division at the Naval Surface Warfare Center (NSWC), Carderock. Susan Brewton focuses on engineering applications of CFD (RANS/DES) at NSWC. en The authors would like to thank Ronald Miller and Jennifer Gorski for their help with the illustrations shown in this article. Further Reading To learn more about ship hydrodynamics simulations, check out the following resources. Conrad, R. E., ?SMP95: Standard Ship Motion Program User Manual,? NSWCCD-50-TR-2005/074 (2005). de Kat, J. O., and Paulling, J. R., ?The Simulation of Ship Motions and Capsizing in Severe Seas,? Trans. SNAME, Vol. 97 (1989). Froude, W. M., ?On Experiments with H.M.S. Greyhound ,?? Trans. INA , Vol. 15 (1874). Gorski, J. J., ?Present State of Numerical Ship Hydrodynamics and Validation Experiments,? Journal of Oshore Mechanics and Arctic Engineering, Vol. 124 (2002). Gorski, J. J., Haussling, H. J., Percival, A. S., Shaughnessy, J. J., and Buley, G. M., ?The Use of a RANS Code in the Design and Analysis of a Naval Combatant,? Proc. 24 th Symposium on Naval Hydrodynamics (2002). Post, D. E., ?A New DoD Initiative: The Computational Research and Engineering Acquisition Tools and Environments (CREATE) Program,? SciDAC 2008, Journal of Physics: Conference Series 125 (2008). en-USJuly 2012 en-US en-USwww.sname.org/sname/mt