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Twenty-Fourth Symposium on Naval Hydrodynamics (2003) / Chapter Skim
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Breaking Waves Generated by a Fast Displacement Ship Model
Pages 296-304

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From page 296...
... The intensity of the breaking is highlighted by the highest values of the wave fluctuations nearby the bow wave crest. The velocity field under the free surface was measured 0.2 Lpp downstream the fore perpendicular by means of a 5-hole Pitot probe.
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From page 297...
... Velocity field has been measured on the port side, at a x-station located 0.2 Lpp downstream the fore perpendicular, using a 5-hole Pitot probe. A classical Pitot tube has been used to measure the static pressure in the undisturbed flow region, far enough from the model.
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From page 298...
... -0.2, -0.~S -0.05 o 0.05 Fig 8: bow breaking wave generated by the INSEAN 2340 model at Froude number Fr = 0.35. The wave height in the bow and shoulder region of the near field wave pattern has been measured.
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From page 299...
... n .n n1 on, -0.1 y -0.075 Fig 12: axial velocity contours and cross-flow vectors at section x = 0.2; reference vector (top-right) is equal to the nominal velocity U0 = 2.621 m/s, the mean value of the wave height is shown by solid line + the rms value (dashed lines)
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From page 300...
... Again, the predicted profile is poorly predicted in the breaking region, an probably also the vertical flow caused by the overturning wave is not well represented. Nonetheless, the predicted flow shows the tendency to overturn close to the wave crest as in the experimental data (figs 12, 16 and 20 x = 0.2~.
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From page 301...
... 0 0.025 0.05 0.075 0.1 y Fig. 21: velocity field contours of the axial velocity component and cross flow vectors.
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From page 302...
... STERN and R PENNA "Towing Tank Experiments of Resistance, Sinkage and Trim, Boundary Layer, Wake and Free Surface Flow around a naval combatant INSEAN 2340 Model" IIHR Report N°421, September 2001.
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From page 303...
... A Di Mascio, R
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From page 304...
... and rms value of the wave elevation in these points. Finally, we refer the uncertainty values of the time-averaged wave elevation to its maximum modulus because it is a non-zero representative value of the measured wave field.
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Key Terms

  • wave breaking
  • wave height
  • breaking wave
  • wave field
  • towing tank

  • free surface
  • velocity field
  • capillary waves
  • axial velocity
  • wave elevation

  • cfd validation
  • ship model
  • fore perpendicular
  • fast displacement
  • uncertainty assessment

  • flow vectors
  • international towing
  • displacement ship
  • numerical simulation
  • experimental results

  • ranse code
  • wave crest
  • velocity component
  • cross flow
  • bow wave

  • obtain experimental
  • insean model
  • static pressure
  • field contours
  • numerical results


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