UFC 4-159-03
3 October 2005
(U.S. Naval Academy (USNA), EW-9-90, Evaluation of Viscous Damping Models for
Single Point Mooring Simulation) are shown as symbols in the drawing, showing that
Equation 11 provides a reasonable estimate of drag coefficients. Predicted current
forces for this example are given in Table 4-6.
Table 4-6. Predicted Transverse Current Forces on FFG-7 for a Current Speed of
1.5 m/s (2.9 knots)
d
d
Fyc
Fyc
T/d
(m)
(ft)
(MN)*
(kips)**
0.096
45.7
150
0.55
123
0.288
15.2
50
0.66
148
0.576
7.62
25
1.03
231
0.72
6.096
20
1.30
293
0.96
4.572
15
1.90
427
* MN = one million newtons
**kip = one thousand pounds force
This example shows that in shallow water the transverse current force can be three
times or larger than in deep water for an FFG-7.
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