API REPORT 80-31B Hydrodynamic Coefficients for Cylinders with Pronounced Marine Growths
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API REPORT 80-31B Document Information:
Title
Hydrodynamic Coefficients for Cylinders with Pronounced Marine Growths
American Petroleum Institute
Publication Date:
Jan 1, 1983
Scope:
Abstract
Vertical cylinders in waves experience a different flow
regime than horizontal cylinders. The wake from the water motion
is constantly being washed back and forth onto the vertical cylinder
in an oscillatory way. For a horizontal cylinder, with the axis
parallel to the wave crests, the wake is rotated about-the cylinder
and its intensity is nearly constant in deep water waves. Because
of the different flow regimes, it is anticipated that the
force transfer coefficients for the Morison equation would be different
for the vertical vs. the horizontal cylinder cases. Therefore,
wave experiments were made on a smooth, sand roughened and
artificially marine roughened vertical cylinder for comparing cd and Cm
values with those for the horizontal orientation. The results showed a
strong increase in both the drag and inertia coefficients for the
vertical cylinder in each case except for the drag coefficient for the
smooth cylinder, which was equal for the vertical vs. the
horizontal conditions.
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