Calculation Method of Added Resistance in Short Crested Irregular Waves

Added resistance in regular waves is calculated from the following equation.

where;

: Increased resistance due to hull motion;

: Increased resistance due to reflected waves.

Added resistance due to hull motion is calculated using   Maruo's theorem .

Added resistance due to reflected waves is calculated from the following equation.

where;

: Fluid density;

: Gravity acceleration;

: Regular wave amplitude;

: Ship's breadth;

:   Bruntness coefficient ;

:   Draft and frequency effect ;

:   Speed effect .