The effect of a plane boundary on wave induced forces acting on a submerges cylinder.

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Author
Jones, Houston Keith
Date
1975-06Advisor
Sarpkaya, T.
Second Reader
Thornton, Edward B.
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Show full item recordAbstract
The in-line and transverse forces acting on cylinders of
1.0 inch to 2.5 inches diameter placed near a plane wall in a
harmonically oscillating flow have been measured. The drag
and inertia coefficients C(d), and C(m) for the in-line force and
the lift coefficients C(1A) and C(1T) for the transverse forces
away and toward the wall, respectively, have been determined
as a function of the relative gap e/D between the wall and the
cylinder and the period parameter V(m)T/D. The relative gap
ranged from 0.0143 to unity and the period parameter from zero
to 35. In the subcritical range where these experiments have
been performed, the effect of the Reynolds number, which ranged
from 4,000 to 30,000, was found to be secondary and certainly
obscured by the excellent correlation provided by the period
parameter.
The frequency of the transverse force was found to range
from one to five times the frequency of oscillation of the harmonic
motion, but a dominant frequency of twice the oscillation
frequency was seen over most of the values of V(m)T/D.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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