Domain decomposition technique for the design of twin hull ship

The computation of the steady flow past a twin hull ship is presented. The numerical method is based on a domain decomposition approach, in which the effects of viscosity and turbulence are taken into account only in a thin region in the neighbourhood of the wetted hull and in the wake. Outside this region, the Laplace equation is solved to obtain the outer potential flow. Free surface boundary conditions have been implemented in a linearized form at the undisturbed waterplane. Suitable matching conditions are enforced at the interface between the viscous and the potential regions. Numerical results, obtained for twin Series 60 hull and for different demihull spacings, show that all the main feature of the flow field have been captured.