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In this study, a radiation and a diffraction problems of a floating body in two-layer fluids were solved by the Numerical Wave Tank(NWT) technique in the frequency domain. In two-layer fluids, two different wave modes exist and the hydrod ynamic coefficients can be obtained separately for each mode. The two-domain Boundary Elem ent Method(BEM) in the potential fluid using the whole-domain matrix scheme was used to investigate the characteristics of wave forces, added mass and damping coeffici ents. The effects of the ratio of density and water depth in the lower domain were also evaluated and compared with given references. ※Keywords: Two-layer fluids( ), Surface wave mode( ), Internal wave mode( ), Two-domain boundary element method(Two-domain  ), Numerical wave tank(  ), Radiation and diffraction problem( ) 1.    /       ,          : 2010 2 22, : 2010 4 26✝, wckoo@ulsan.ac.kr, 052-259-2767

Numerical Analysis of Hydrodynamic Forces on a Floating Body in Two-layer Fluids