Open AccessComparison of shallow water effect on a monohull and chine catamaran
Author(s) -
Wiwin Sulistyawati,
Bambang Sudjasta,
D Y Waskito
Publication year - 2022
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/972/1/012046
Subject(s) - chine , squat , trim , hull , stern , china , engineering , marine engineering , structural engineering , geography , physiology , archaeology , biology
Many modifications to the hull shape have been made to obtain the optimum hull to reduce resistance. Various modifications of hull shape, as well as with the addition of the number of hulls, become multihulls. This study conducted a comparative study of monohull rounded and chine catamarans on the squat factor by varying the water depth ratio h/T 1.2, 1.3, and 1.5. The analysis is also carried out on the sinkage and trim factors by varying the ship’s trim with changes in LCG points and variations in speed. The simulation results on the effect of depth ratio show that chine catamaran has a squat effect lower than monohull at Fr 0.5. The depth ratio h/T 1.2 of 9.83%, h/T 1.3 of 18.3%, and the h/T 1.5 of 20.69%. At a lower speed Fr<0.3, the monohull has a lower squat effect than chine catamaran. For the effect of 10% LCG trim by stern on the sinkage factor, chine catamaran has a lower value than monohull at Fr 0.5. The analysis results show that chine catamaran has a sinkage effect of up to 40.4% lower than monohull at a ratio of h/T 1.3. In trim by bow conditions, chine catamaran had a lower sinkage effect than monohull at Fr 0.5 with the most significant deviation of 34.21% at a ratio of h/T 1.5. The overall analysis shows that monohull has a remarkable effect on shallow water at Fr<0.3. While at higher speeds, catamarans have a lower influence on the squat, sinkage and trim factors in shallow water conditions.