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OPENING ADDRESS Hisashi KaJitani Professor, The University of Tokyo The Fifth International Conference on Numerical Ship Hydrodynamics is now open at the newly built Hiroshima International Conference Center, gathering over one hundred and ninety distinguished researchers from eighteen countries. The Conference is sponsored by David Taylor Research Center, Office of Naval Research, Naval Studies Board of the National Research Council and the Shipbuilding Research Association of Japan. We appreciate heartily their continuous encouragement and financial support. This is the fifth Conference. The first two were held in the United States in 1975 and 1977, the third in France in 1981 and the fourth again in the United States, Washington DC in 1985. With increasing the time, the remarkable progress was made in exchanging knowledge and new arts in the field of ship hydrodynamics and ocean engineering. It was about four years ago that a group of Japanese colleagues proposed first to invite this conference to Japan. Since then, Ms. Joanna Schot has endeavored on the US side greatly as a co-chairperson, and Prof. Kazu-hiro Mori of Hiroshima University worked hard as the main coordinator for the management of the Conference. It is hard to express our full acknowledgement for their contributions. As you know through the program, four keynote lectures and high quality forty-six papers are presented. They deal with mainly 1) the flow simulation by Navier-Stokes solver, 2) simulation of free surface flow and forces by boundary element or boundary integral method including Rankine source method, 3) motion of ships or bodies among waves including waves of radiation and diffraction, and 4) several important topics about turbulent flow, ray theory, treatment of Green function for free surface flow, soliton, squat, free surface boundary layer with surface tension, image processing, cavitation, hull-appendage juncture flow and so on. Many papers were received for the proposed topics of the program. We endeavored to accept as many as possible by compressing the presentation time and setting up some parallel sessions. Even so, still some good papers could not be accepted. However, we earnestly expect hot and ample discussions by all the participants. For this purpose and to deepen our understanding, we decided to devote the final session, though optional, for group discussions. Participants may choose either of the three topics, i.e. Rankine source method, N-S solver and BIM for radiation and diffraction problems. I am expecting that a lot of free and dreamful discussions will be take place there. Our interest to know the fluid dynamics phenomena is expanding widely and profoundly. We know that many new problems to be studied are arising and range from micro scale fluid flow for the resistance reduction to global scale flow as one of the importance in environmental science and technology. Hiroshima, a cultural center of mid-west of Japan, is a reborn but historical city. A history around Hiroshima conveys a famous story of "three arrows" that has been transferred from a Samurai general M. Mohri of this district to his three sons of battle age about 450 years ago. The very old general Mohri said to his three sons; one arrow is easy to be broken down but three arrows are not if they are bounded together tightly. Thereby he asked his sons to cooperate each other for the best results. We admit that the development is great in numerical ship hydrodynamics. However, we recognize at the same time that the final target is to grasp the fundamental and fine knowledge about the fluid flow physics. For this end the cooperation and binding together of three arrows -- analysis, computation and experiment -- is essential. I hope you'll enjoy the Conference as well as the scenery and the history of Hiroshima. 2