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The breakdown into the resistance components of catamaran form for deep sea condition has been well-established, although a number of research to improve the understanding of the components is carried out continuously around the world and including at ITS. The current work is concentrated on the investigation of the effect of water depth, namely de...
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... between experimental result of resistance (corrected using Schuster formula) and CFD Tdyn at various water depths was presented in Tables 3-5, where those comparisons demonstrated the difference between the two approaches is about 5.3% -8.5% and can be seen in Table 2. Comparative analysis between experiment and CFD was carried out and shown in Figures 6-8 showed that the maximum resistance interference occurs at S/L = 0.3 at shallow and medium waters, S/L = 0.4 at shallow and medium waters and at S/L = 0.2 for medium waters at critical speed F rh = 1. ...Citations
Although the design of trimaran hull has gained popularity at the end of the 20 th century, there are few databases available to numerical analysis of trimaran hull. This paper presents a numerical study of the resistance of trimaran hull at various length ratio (S/L) 0.2, 0.3, 0.4 and Froude numbers 0.2 to 0.6 carried out by CFD simulation using FINE TM /MARINE by NUMECA software and experimental data. Tri-A has a lower resistance than the trimaran B and C at low Froude number, but at hight Froude number 0.5 and 0.6, the Tri-A has a low resistance than the others. These results are compared with towing tank test data and obtained a lowest difference in the resistance of 0.98 % at TRI-A3. The lowest resistance for the trimaran model is Tri-C5 (Fr=0.6; S/L=0.4) with a total resistance coefficient (C T ) of 65.89x10 ⁻⁴ , this is due to favorable wave interference with a minimum IF of 0.02. The Interference Factor (IF) follows the same pattern in each configuration, however at maximum Fr, the minimal IF produced on Tri-A3(Fr=0.4; S/L=0.2), Tri-C4 (Fr=0.5; S/L=0.4), and Tri-C5 is 0.22, 0.12, and 0.02, respectively. Where the lowest IF indicates a positive effect because the resistance of the interference hull is lower hull at high speed. The results of this study are expected to be able to strengthen the data base in presenting the effect of interference resistance of the trimaran, which can then be applied directly in determining the magnitude of the ship’s propulsion at the preliminary design stage.
