RANS Simulations of Ship Motions In Regular And Irregular Head Seas Using the SWENSE Method

This paper presents recent advances of the SWENSE (Spectral Wave Explicit Navier-Stokes Equations) approach, a method for simulating fully nonlinear wave-body interactions including viscous effects. Potential flow theory is used to compute the incident waves while viscous effects are taken into account by using a Reynolds Averaged NavierStokes Equations (RANSE) solver to obtain the diffracted field in the full domain. Arbitrary incident wave systems can be described, including regular, irregular waves, multidirectional waves and focused wave events. The model may be fixed or moving with arbitrary speed and 6 degrees of freedom motion. This paper is devoted to the validation of the SWENSE method in irregular head waves, in the case of an extensively long 2 DoF simulation. Results of the present approach compare favorably with experimental data.