Wave motions occurring in the presence of multi-hull ships have several fascinating properties. The spacing between the hulls can both support sloshing and Helmholtz wave (shown in the figure above) modes. Certain multi-hull geometries can also trap waves, at least per linear inviscid wave theory. The trapped waves are local and decay to zero at infinity. Most works on the subject are based on linear potential-flow wave theory. In this ongoing work, we investigate effects of vicosity and free-surface nonlinearity on the wave generation and diffraction by multi-hull ships.

References
P. Ananthakrishnan (with J. Chaffin), ``Inviscid and viscous flow analyses of multi-hull ships under forced oscillations in a free surface,'' Proccedings of the 8th International Conference on Hydrodynamics, Nantes, France, 2008.