Current Coefficients and Shallow Water Correction

Default and user supplied non-dimensional current coefficients which depend on direction and water depth H are defined by:

Longitudinal Force

Transverse Force

Yaw Moment

Default current coefficients for three classes of vessel are given in Environmental Effects for deep water. You can supply alternative coefficients for either deep or shallow water. Current coefficients which are supplied for a semi-submersible need to be defined differently with respect to the underwater profile areas as given in equations (3) of Current Coefficients Data File

If desired, the following default shallow water correction, which has been developed internally, can be applied to monohulls:

where

and is the direction of the current relative to the vessel. (Head corresponds to 0 degrees.)