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1 TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

1 2025

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Numerical Analysis of the Effect of Passive Free Surface Tank on Rolling Motion of Batang-Type Traditional Fishing Vessel

Chrismianto Deddy, Yudo Hartono, Arswendo Adietya Berlian, Firdhaus Ahmad, Abel Salassella Alfian

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2025

Vol. 19 No. 2

407--416

Ship accidents are caused by various factors, one of which is excessive roll motion that can lead to capsizing. To address excessive rolling, the passive free surface tank device is a potential solution that can be applied. In order to ensure good performance of the passive free surface tank, it is necessary to investigate the effect of the tank's dimensional configuration on the damping it generates. By identifying the best tank configuration, it is hoped that this study can provide useful references for the design of passive free surface tanks, especially for traditional fishing vessels. The analysis begins by creating several tank specimens with variations in length and fluid height. The performance of the passive free surface tank is evaluated based on the RMS values generated by the ship with the tank, which are then compared to the RMS values of the ship without a tank. In the analysis, FEM-based software is used to assist in the calculations. The results show that the ship with the addition of passive free surface tank type C1 produces the highest roll damping, with a damping percentage of 20.01% at empty load, 25.12% at half load, and 24.37% at full load.