The analysis of resistance and wave of catamaran using computational fluid dynamics
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Abstract
This study was performed to analyse the total resistance and wave profile of a catamaran using Computational Fluid Dynamics - the Finite Volume Method. The work was conducted within the operating conditions of the waterbus service in the Chaophraya River, Bangkok. The total resistance was analysed at different operating speeds with the corresponding waterline Froude number (Fn) equal to 0.5 – 0.7. Within the study range, the calculated total resistance coefficient (CT) and wavemaking resistance coefficient (CW) were found to decrease as the Fn decreased. While the viscous resistance coefficient (CV) was almost unchanged. The waves generated when the catamaran sailed through calm water were then analysed at the depth Froude number (Fnh) between 0.6 - 0.7 corresponding to the maximum and minimum route depths. It was found that the calculated wave profiles increased as the depth decreased. The waves generated in shallow water also travelled in longer distance than those generated in deeper water. The study has shown that the method developed here could be practically applied in the preliminary design of actual catamarans where energy-saving and environment friendliness are the key design. However, a further study with finer meshing and more advanced mathematical models should be conducted in order to achieve more accurate results.
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References
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