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SUMMARY:Experimental study on dead water resistance of ice floe in a two-l
 ayer fluid - Ying Gou (Dalian University of Technology)
DTSTART:20171006T104500Z
DTEND:20171006T113000Z
UID:TALK84421@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:<span>Co-author: Bin Teng		(University of Technology)        <
 br></span><span><br>The dead water phenomenon is well known that when a bo
 at is sailing on a two-layer fluid\, there is an extra resistance due to t
 he wave generating at the interface. Here\, we investigate the dead water 
 resistance of a&nbsp\;ice floe&nbsp\;instead of slender streamline body by
  three-dimensional towing experiments. The length-width ratio of&nbsp\;ice
  floe&nbsp\;is 1.5. The dimensionless&nbsp\;ice floe&nbsp\;draught <i>d</i
 >/<i>h</i>1 is varied from 0.5 to 1.0\, where <i>h</i>1 is the upper layer
  depth. The Froude number <i>Fr</i>=<i>U</i>/<i>c</i>0 is in the range 0.3
 ~1.3 (<i>U </i>towing speed\, <i>c</i>0 the linear internal long wave spee
 d). The experiment results show that dead water coefficient <i>C</i>dw and
  function <i>C</i>dw/(<i>d</i>/<i>h</i>1)2 attains a maximum at subcritica
 l Froude number\, <i>Fr</i>&asymp\;0.5~0.6\, which is smaller than the pre
 vious results of slender ship. For relative small draughts\, <i>C</i>dw/(<
 i>d</i>/<i>h</i>1)2 depends on the Froude number only in the range close t
 o critical speed (<i>Fr</i>>0.85)\, irrespective of the draught\, which is
  same with the previous observations. But this conclusion is not applied f
 or the case <i>d</i>/<i>h</i>1=1.0. The different variation tendency of <i
 >C</i>dw/(<i>d</i>/<i>h</i>1)2 versus <i>Fr</i> is observed here. That mea
 ns an extended study should be continued for deeper draught cases.</span>
LOCATION:Seminar Room 1\, Newton Institute
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