Now, we have a what is called as the Froude-krylov force, and in general or the diffraction force calculations are based on the Froude-Krylov pressure forces, which are derived from ideal flow, and by applying the linear airy’s theory. Now, these forces are then modified by experimental flow coefficients, but what exactly is Froude-Krylov force? Froude-Krylov force is nothing but the forces that the pressure field is, we assumed that the pressure field is completely undisturbed by the presence of any structure.