The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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Session: Computational Fluid Dynamics I
Room: Room 2
Session start: 10:30 Mon 19 Sep 2016

Prachakon Kaewkhiaw
Affifliation: Kasetsart University

Jun Ando
Affifliation: Kyushu University

Topics: - Ship hydrodynamics resistance, propulsion, powering, seakeeping, manoeuvrability, slamming, sloshing, impact, green water, - Computational fluid dynamics


Long-Tail Boat is a type of boat native in Thailand. It is often used to transport passengers and tourists especially in Chao Phraya River in Bangkok. It is classified in kind high speed boat because operating velocity is much high. The propeller is conducted to inclined shaft propeller condition with 12º from horizontal axis because it has shallow water draft. The propulsion systems of Long-Tail Boat propeller have never been studied theoretically. Therefore, the evaluation of propeller performance of standard propeller of Long-Tail Boat by model test and optimization of propeller blade shapes are considered to the objective of this study. The improving propulsive efficiency is a eternal goal for naval architects. It is good established helping for reduction of the CO_2 emissions which impacted to environment. Therefore, propeller performance has great influence on propulsive performances of the boat. Then, propeller improvement is significant for energy saving. This paper is presented numerical calculation of propeller performance in standard propeller of Thai Long-Tail Boat by RANS code Fluent and a simple surface panel method “SQCM”. After that, blade shapes of the Long-Tail Boat propeller are optimized by using real-coded genetic algorithm. The calculated results of propeller performances with original and improved propellers by both methods are compared with experimental data of high speed circulating water channel at Kyushu University. The agreement between the experiment and numerical results are good in original and improved propeller. Moreover, the propeller performances of original and improved propellers in actual inclined shaft condition are calculated by using Fluent. The calculated propeller efficiency of improved propeller is increased in inclined shaft condition.