Determination of Hydrodynamic Coefficients of Oblique Towing Test of a High-Speed Boat by Computational Fluid Dynamics

An accurate equation-based method can be utilized to investigate the maneuverability of a high speed boat to reduce the cost and time of simulations. However, the accuracy of the equation based method depends on the accuracy of hydrodynamic coefficients of maneuvering equations. These coefficients can be calculated using experimental and numerical methods. In this study, the oblique towing test (OTT) is conducted using computational fluid dynamics (CFD) approach for a boat in two drift angles where two damping coefficients Yv and Nv are extracted. The boat is considered free in heave, pitch and roll motions and the overset grid technology is used to avoid the grid distortion in large variations in heave, pitch and roll motions. For the validation purposes, the calculated force coefficients, yaw moment coefficient, dynamic trim, heel angles and the dynamic sinkage are verified experimental results.