Estimation of Ship Resistance in Deep and Shallow Water

The program uses the BSRA Methodical Series [References 6] to calculate the ship resistance in deep water. The resistance data is fitted with a third order polynomial function:

where is the total ship resistance in deep water, u is the ship speed in X-direction, AD1, AD2 and AD3 are the resistance coefficients in deep water. The Schlichting Method [References 25] is used to calculate the speed loss and the increase in ship resistance due to shallow water. Speed loss in water is given by:

where the subscript refers to deep water and is the speed loss due to shallow water effect. H is the water depth, is the midship section and g is the gravitational acceleration. The shallow water resistance is fitted with a third order polynomial in the form:

where is the total ship resistance in shallow water, , and are the resistance coefficients in shallow water.