A Study on Free-Surface Flow around Bow of Slowly Moving Full Forms

概要

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From the flow measurement around the bow of a slowly moving full form it was found that except in the thin boundary layer near the free surface, velocity components agree well with the calculated values from the velocity potential which satisfies rigid・wall free surface condition. In the thin free surface layer the velocity components change depthwise very rapidly. Based on this experimental result a theory to analyze the thin free surface layer around slowly moving full forms was developed. To verify the validity of the present theory wave making resistance of geometrically simpler forms, viz., a vertical, infinite circular cylinder and a semi submerged sphere was calculated in low speed limit. From this calculation it was found that the order of magnitude and the trend of wave making resistance with respect to Froude number are in good agreement with those of conventional full forms determined experimentally.