Abstract: in ship hydrodynamics, the determination of performances (such asresistance, motion characteristics etc.) of a given ohject or the flow field around the object under various running conditions and environmental conditions is known as the direct problem. On the contrary, in some case, we will have to find a suitable object having given performances or given flow field characteristics, which is the so called the inverse problem.The aim of the present paper is to make some comments on the special features and ...