![]() Milanov et al.(2012) conducted an experiment on a Delft 372 catamaran with the water-jet in both deep and shallow waters. The results showed that the hydrodynamic force increases with decreasing water depth and increasing Froude number. For example, Zlatev et al.(2009) performed an experiment involving a high-speed catamaran at Bulgarian Ship Hydrodynamic Center (BSHC) to investigate the maneuvering characteristics at various water depth ratios and different Froude numbers. A large number of theoretical and numerical studies as well as experimental investigations have recently been conducted with a focus on the hydrodynamic force acting on the catamaran. The catamaran not only operates at high speed, but it also operates at low speed in special cases such as near harbor. Nowadays, catamaran is widely used for variety of purposes due to their excellent performance in terms of safety, resistance performance, transverse stability, and large deck area. 핵심용어: Delft 372 Catamaran, Low Speed, Hydrodynamic Coefficients, RANS Numerical Method, Virtual Captive Model Test, Maneuvering Simulation 1. Finally, the maneuvering simulation in low speed conditions was performed by using the estimated hydrodynamic coefficients. By analyzing these results, the hydrodynamic coefficients of the catamaran at low speed were estimated. Conversely, pure sway test and pure yaw test also were simulated to obtain added mass coefficients. The Fourier coefficients obtained from the measured hydrodynamic force were compared with those of other ship types. Also, the pure rotating test and yaw rotating test proposed by Takashina, (1986) were conducted. The drift test with drift angle 0-180 degrees was performed and the resulting hydrodynamic forces were compared with the trends of other ship types. Second, the virtual captive model test for a catamaran at low speed was conducted using the verified method. The numerical method for the CFD (Computational Fluid Dynamic) calculation was verified by comparing the hydrodynamic force with that obtained experimentally at high speed condition and it rendered a good agreement. First, the turbulence study and mesh independent study were conducted to select the appropriate method for numerical calculation. In this study, the Delft 372 catamaran model was selected as the target hull to analyze the hydrodynamic characteristics by using the RANS (Reynold-Averaged Navier-Stokes) numerical method. This paper discusses the hydrodynamic characteristics of a catamaran at low speed.
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