Side Wall Effects of a Towing Tank on the Measurement of Unsteady Waves of Ships Advancing in Waves

概要

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The measurement of unsteady waves in a towing tank is simulated numerically and the side wall effect is discussed especially for the measured unsteady waves in the low frequency range. Unsteady waves measured by Ohkusu's method are now very useful and unieque to validate the highly advanced computation methods for seakeeping. Usually the measurements are carried out for high frequency range, escaping from the side wall effect of a towing tank due to propagating waves in front of the ship model. The measurement itself, however, is possible even for the low frequency range allowing some side wall effects of the towing tank. If the effect is made clear, the obtained experimental data can be used as an index to validate computations. The numerical simulation is performed simplifying the complicated ship motions by a pulsating point source. The space fixed coordinate system is adopted and the point source is accelarated arbitrary corresponding to the time history of the velocity of the towing carriage in the experiment. Two results, with and without side wall, are compared and the side wall effect is discussed.
社団法人日本船舶海洋工学会の論文
2001-08-31