3. Wind calculation

3-1 Calculation method

Added resistance due to winds,, is calculated by the following formula

on the basis of the mean wind speed and wind direction.

In heading winds the drag coefficient, , is derived as following, for example,

where:

: air density

: projected transverse area above water line,

: mean wind speed

: ship breadth, : projected lateral area above the summer load line,

: length overall,

: distance from the midship section to the center of projected lateral area;

a positive value of means that the center of the projected lateral area

is located ahead of the midship section.

Reference

[1] T. Fujiwara, M. Ueno and Y. Ikeda: Cruising performance of a large passenger

ship in heavy sea, Proceedings of the Sixteenth International Offshore and

Polar Engineering Conference, Vol. III, pp.304-311, 2006.

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