DRAG OF YAWED PILE GROUPS AT LOW REYNOLDS NUMBERS

The hydrodynamic drag on square arrays of model cylindrical piles in the Reynolds number range of 250 to 750 is shown to be a function of the angle of yaw of the incident flow and is also related to a parameter termed the normalized projected area. The drag coefficient of a pile group increases as the number of piles is reduced and as the pile spacing is increased and may be greater than the measured single-pile value of 0.94 in the velocity gradient flow. The data suggest that the replacement of a structure consisting of a large number of small-diameter piles by an equivalent group of fewer larger diameter piles will reduce disturbance of the flow field and thus reduce siltation and ship-mooring forces.

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  • Accession Number: 00316288
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM