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An Assessment of Naval Hydromechanics Science and Technology (2000) / Chapter Skim
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3 Technology Issues
Pages 12-17

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From page 12...
... Recent data acquired on very quiet ships reveal noise sources caused by turbulent boundary layer flow that were hitherto hidden by other, more intense radiation mechanisms. Although direct radiation from boundary layers is very weak, a turbulent fluid boundary layer along an elastic solid boundary can generate significant noise levels.
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From page 13...
... Technology areas affecting surface ship stealth include hydrodynamics, hydroacoustics, and electromagnetics. Seakeeping and speed are other important considerations in ship design, and here hydromechanics is important: "The ability to develop hull forms capable of sustained operations at high speed in heavy seas would yield tremendous tactical benefits, and the peak performance of any crew is enhanced if the adverse effects of roll and pitch can be minimized." 1Naval Studies Board, National Research Council.
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From page 14...
... O ~ O _ More recently, the JASONs conducted a study entitled "Fast Ships" that was sponsored by the ONR and the Defense Advanced Research Projects Agency (DARPA) .2 The study, conducted by a team of experts led by Paul Dimotakis of the California Institute of Technology, hypothesizes an extremely challenging future Navy mission and investigates ship concepts required to achieve the mission.
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From page 15...
... The direct numerical simulation of turbulent flow is one way to increase the knowledge base that is needed to develop improved models. The committee believes that one role of the university principal investigator is to develop innovative numerical solutions that address generic difficulties impeding progress.
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From page 16...
... Scaling to High Reynolds Numbers When a new submarine or surface ship is being designed, the required performance parameters that are predicted by analytical or numerical methods must be validated by scale model tests. The data acquired experimentally are intended to demonstrate that the ship's specifications will be met.
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From page 17...
... These physiochemical and biological effects are clearly of importance to the Department of the Navy and are not typically supported by the research programs of other agencies. Driving home this point, Tulin says that we have failed to learn enough about fundamental hydrodynamic phenomena related to surface effects and about how these phenomena relate to remote detection.
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Key Terms

  • surface ships
  • free surface
  • cavitation inception
  • radiated noise
  • drag reduction

  • wave breaking
  • boundary layer
  • air entrainment
  • hull forms
  • fluid dynamics

  • surface ship
  • current technical
  • noise levels
  • elastic solid
  • surface tension

  • physical phenomena
  • structural vibrations
  • towed array
  • ship design
  • solid boundary

  • blade rate
  • layer flow
  • asymptotic analysis
  • basis using
  • wave fields

  • remote detection
  • special consideration
  • report claims
  • involve research
  • hydromechanics included


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