Virtual Marine Arsenal

Mchl is a software for calculating the wave making resistance considering an effect of the gradient of hull form in the depth direction based on linear approximation, which is made by modifying the original Michell’s thin ship formulation and by using Havelock’s Green function.

The effects of vertical gradient of the hull on wave resistance are the phase shift in Froude number domain and the decreasing amplitudes of humps and hollows in comparison with Michell’s integral. Michell’s method is still competitive with modern CFD code.

Mchl controls the added depth gradient term to affect in low Froude number range by a condition which improves slightly in low Froude numbers but needs more computing time than Michell’s integral so as to solve a boundary integral equation.