Abstract
This study presents the full-scale resistance and seakeeping performance of an awarded Double-M craft designed as a 15 m next-generation Emergency Response and Rescue Vessel (ERRV). For this purpose, the Double-M craft is designed by comprising the benchmark Delft 372 catamaran with an additional center and two side hulls. First, the resistance and seakeeping analyses of Delft 372 catamaran are simulated on the model scale to verify and compare the numerical setup for Fr = 0.7. Second, the seakeeping performance of the full-scale Double-M craft is examined at Fr = 0.7 in regular head waves (λ/L = 1 to 2.5) for added resistance and 2-DOF motion responses. The turbulent flow is simulated by the unsteady RANS method with the Realizable Two-Layer k-ε scheme. The calm water is represented by the flat VOF (Volume of Fluid) wave, while the incident long waves are represented by the fifth-order Stokes wave. The residual resistance of the Double-M craft is improved by 2.45% compared to that of the Delft 372 catamaran. In the case of maximum improvement (at λ/L = 1.50), the relative added resistance of the Double-M craft is 10.34% lower than the Delft 372 catamaran; moreover, the heave and pitch motion responses were 72.5% and 35.5% less, respectively.
Highlights
There is a great interest in multi-hull ships in the design orientations preferred as the new generation
The main hulls of the prototype Double-M craft were chosen as the benchmark Delft 372 catamaran hull due to the existence of many numerical and experimental studies on the seakeeping performance [3,4,5,6]
Within the scope of the study, regular wave computations of Delft 372 catamaran were performed with a constant Froude number (Fr = 0.7) and three different wave/ship length conditions
Summary
There is a great interest in multi-hull ships in the design orientations preferred as the new generation. In the study of Mao et al [23], the pitch and heave motions of the Double-M craft in the head waves are examined at different Fr numbers with the CFD method. This study exposes, in two main parts, the seakeeping responses and the added resistance prediction of a full-scale Double-M craft in regular waves using the CFD-URANS approach. The full-scale Double-M craft is investigated for the performances in regular wave conditions within the added resistance and 2-DOF motion responses. The effect of the increase in the number of hulls on these parameters was investigated by comparing the non-dimensional added resistance coefficient and motions obtained from two different multi-hull vessels.
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