UFC 4-159-03
3 October 2005
STATIC WIND FORCES/MOMENTS. Static wind forces and moments on
4-4
stationary moored vessels are computed in this chapter. Figure 4-1 shows the definition
of some of the terms used in this chapter. Figure 4-2 shows the local coordinate
system.
4-4.1
Static Transverse Wind Force. The static transverse wind force is
defined as that component of force perpendicular to the vessel centerline. In the local
ship coordinate system, this is the force in the "Y" or sway direction. Transverse wind
force is determined from the equation:
Fyw = 0.5 ρa Vw 2 A y C yw f yw {θw }
EQUATION:
(2)
where
transverse wind force (newtons)
Fyw =
ρa =
mass density of air (from Table 4-1)
wind speed (m/s)
Vw =
longitudinal projected area of the ship (m2)
Ay =
transverse wind force drag coefficient
C yw =
f yw {θ w } =
shape function for transverse force
θ w = wind angle (degrees)
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