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

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:

EQUATION:

(2)

where

transverse wind force (newtons)

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)

65