In this research, experimental results are provided for the resistance and wave profile tests around a bare hull of a surface-craft called David Taylor Model Basin 5415 (DTMB-5415). The experiments were carried out in the Subsea Science and Technology Research Center towing tank on a model with a new scale of 1:71 for Froude numbers between 0.05-0.45 and free-model condition. The experimental results were also compared to the numerical results obtained from a free surface commercial code. The model manufacturing procedure, parameters measurement setting, data acquisition and analysis of the experimental results followed the International Towing Tank Conference (ITTC) standards and technical committee reports. Since the purpose of this study is to prepare databases for performing experiment with a new scale model, the effects of the model scale on the results were studied and a suitable factor of 0.084 was found for the form factor. One important issue in the Computational Fluid Dynamics (CFD) application is the prediction of the power demand of a new ship. The numerical analysis was accomplished by the RANSE free surface commercial solver CFX. The CFX code is based on a finit volume discretization. In this study, turbulence was modeled using the k-? model and the volume fraction method was applied for the free surface approximation. A wall function approach is employed to bridge the nearwall and outer turbulent flow region. Second order accuracy schemes were also used to discretize the advection terms in the momentum equations. To improve convergence, volume continuity equation was solved implicitly. An unstructured grid consisting of tetrahedral, prismatic, pyramid and hexahedral cells has been used. Grid dependency study has been done to optimize the mesh in the control volume for the numerical studies. All the numerical equations are solved using algebraic multi-grid acceleration with implicit smoothing. Parallel computation on a 2 processors PC adopted to reduce the required computational time. Based on this analysis, the total resistance, the results of wave profile on the bare hull and the velocity contour were presented in the aforementioned range of Froude number. Some of the computational results are validated against experimental data in terms of various global and local quantities. The calculated total resistance coefficient shows an increasing tendency against Froude number. Similar to the calculated total resistance coefficient, the calculated wave resistance coefficient increases with the Froude number. The calculated friction resistance coefficient is insensitive to the Froude number and shows a low decreasing tendency against it. Keywords :Experimental Fluid Dynamics (EFD), Computational Fluid Dynamics (CFD), Resistance Test, Wave Profile Test, Form Factor, Free Surface Flow, Volume Fraction Method, DTMB-5415.
