Abstract
This paper presents a numerical method based on the Navier-Stokes equations to evaluate viscous forces acting on a moving body. A cell center based finite volume method for unstructured grids is applied to discretize the computational domain and solve the governing equations. A floating body with or without bilge keels undergoing roll motions at different roll angles is taken as model case. Evaluation of hydrodynamic coefficients due to viscous forces is conducted. The numerical results show that the roll-damping coefficients obtained by using the Navier-Stokes solver are larger than the radiation damping coefficients evaluated by the linear potential theory due to viscous and vortex effect.
