This report is concerned with numerical simulations of the wake behind surface ships and submarines using models based on solving the full Navier Stokes equations. Ship waves have for long been of great interest to naval architects since the Kelvin waves are responsible for a significant part of the total resistance, especially at high speeds. More recently, however, the viscous wake have attracted considerable interest since it leaves a persistent trace on the ocean or sea-surface, and thus offers an effective means of ship or submarine detection by e.g. airborne radar. Furthermore, the wake astern of surface ships and submarines contains intrinsic information about the vessel that created the wake, its course and speed, and is therefore of considerable interest when examining alternative homing devises for torpedoes. The present study is the first step towards developing a more fundamental understanding of the mechanisms behind the wake, its dynamics and its decay. For this purpose numerical simulations have been carried out for simple ship hulls at different Froude numbers and different depths, as well as for a submarine configuration. To simplify matter we have so far neglected the effects of the propulsor but this will be remedied in future studies. The wake behind the surface ship interacts with the surface to produce characteristic features that can be obtained from e.g. synthetic aperture radar, whilst the submarine wake does not interact with the surface unless the submarine alters its depth.


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    Title :

    Computational Study of Wakes behind Submarines and Surface Ships. Base Data Report


    Contributors:
    E. Lillberg (author) / N. Alin (author) / C. Fureby (author)

    Publication date :

    2000


    Size :

    31 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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