Calculating the Form Factor

Hullspeed can automatically calculate the form factor that is used during the slender body analysis. You can chose to specify the form factor directly, or use Hullspeed’s Holtrop for Monohulls or the Molland algorithm for catamarans.

The Molland et al. method uses the demihull slenderness ratio, , to determine the form factor according to the following equation:

Note that this expression is for the form factor, , of the complete catamaran including viscous interaction effects between the demihulls.

For more information please refer to the Bibliography on page 52.