Calculation Of Wave Making Resistance Of Ship Using NURBS-Based Higher Order Panel Method

Numerical prediction of ship hydrodynamic performance using computational fluid dynamics (CFD) technique at design stage is an important and challenging subject in the field of ship hydrodynamics. With the rapid development of computational methods and computer technology, CFD is becoming a practical tool in ship design. it tends to be an partial alternative of towing tank tests.In this paper a higher order panel method based on Non-Uniform Rational B-Spine (NURBS) is used to simulate the ship wave making problem. NURBS is applied to represent the 3 dimensions body geometry of the ship and Rankine source strength is distributed on panels of the body surface and above the free surface. The source strengths are determined by satisfying the body surface boundary condition and the linear free surface boundary condition. Then the velocity potential, the wave pattern and the wave resistance could be obtained in the computational domain. The radiation condition is satisfied numerically with collocation points shifting upstream.Wigley ship is selected as a common computational example. The wave making resistance and wave patterns of monohull and catamaran in deep water and shallow water are calculated respectively. The comparison between the result of this program and that of ShipFlow software is encouraging. The phenomenon of solitary wave generated by the ship in shallow water can be observed.The results show that the theoretical and numerical method in this thesis is feasible.