Abstract: In the purpose of revealing the mechanism of motions and wave forces of floating rectangle boxes driven by waves, a numerical mode based on the Smoothed Particle Hydrodynamics (SPH) method was developed. The motions and wave forces of a single floating rectangle box under different Keulegan-Carpenter (KC) numbers were systematically studied, and the motions of two floating rectangle boxes under different spacings (δ) between floating bodies were also examined. It was found that the surge, heave and pitch motions of the single floating rectangle box all intensified with the growth of KC number, and the corresponding wave forces also strengthened. As δ increased, the surge motion of the upstream floating box (floating box I) gradually approached that of the single floating box, while the heave and pitch motions were approximately unaffected. Moreover, the surge motion of the downstream floating box (floating box II) strengthened apparently, the pitch motion showed a tendency of gradual decline, whereas the heave motion was still approximately unaffected.

Key words: floating rectangle box, motions, SPH method, KC number, spacing between floating bodies, wave forces