SHIP

C

NOTES

Hull dominated

0.82

Aircraft carriers, drydocks

Typical

0.92

ships with moderate superstructure

Extensive

1.02

superstructure

The shape function for the transverse wind force (NCEL, TN-1628) is

given by:

f yw {θ w

}=

+ (sinθ w - 0.05* sin{5θ w }) / 0.95

EQUATION:

(4)

where

f yw {θ w } = transverse wind coefficient shape function

θw

= wind angle (degrees)

Equation 4 is positive for wind angles 0 < θw < 180 degrees and negative

for wind angles 180 < θw < 360 degrees. Figure 4-4 shows the shape and typical

values for Equation 4.

These two components were derived by integrating wind over the hull and

superstructure areas to obtain effective wind speeds (NCEL, TN-1628). The following

example illustrates calculations of the transverse wind force drag coefficient.

69