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Case (5-a) shows the result in still water. The numerical results of track and heading angle are practically similar to experimental results. The experimental results of ship speed are obtained from differential value of the data of track of the ship.
Fig.5 |
Comparison of numerical and experimental results about the track of CG, the heading angle and the ship speed during turning maneuver. Case (5-a) is on still water, and the rest, on waves |
Case(5-a)
(Vini=12kt, δ=35 deg Still water)
Case(5-b)
(Vini=12kt, H/λ=1/27.0, δ=35 deg Steering in Following sea)
Case(5-c)
(Vini=12kt, H/λ=1/22.1, δ=35 deg Steering in Beam sea)
Case(5-d)
(Vini=12kt, H/λ=1/49.5, δ=35 deg Steering in Beam sea)
From Case (5-b) to (5-d), they show the comparison of the results of which the ship turns in waves. In Case (5-c), there are some differences of the track of ship between Cal. and Exp., however the time histories of heading angle and ship speed are approximately close to experimental results. So, we consider the present numerical simulation in time domain is adequately reliable for estimation in our purpose. About the rolling motion in maneuvering motion (not shown in this figurre), validation was also carried out and this is described in the paper by Hirayama, Nishimura and Fnkushima [3].
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