学术校庆|潘志远博士学术报告通知

报告人简介：Dr. Pan (潘志远) holds the current position of Principal Specialist in Hydrodynamics at DNV Digital Solutions. He received a PhD degree in Ocean Engineering from Shanghai Jiao Tong University in 2006. He has been working on development of hydrodynamics modules in the Sesam system since 2009 and has been involved in several Joint Industry Projects. His previous experience includes working as a support engineer in DNV Software and research engineer in China Ship Scientific Research Center. He has published more than 20 papers in journals and conferences.

报告摘要：The importance of mesh refinement near the waterline and sharp corners is demonstrated for mean drift forces, as well as low-frequency components in bi-chromatic wave conditions. To achieve better local panel refinement, a stretching factor is introduced to the Cosine spacing formulation used in meshing for the potential flow solver. This approach yields an economical and effective mesh for second-order analyses. An optimal mesh for a bottom-fixed cylinder is identified by comparing the horizontal mean drift force from numerical results against analytical values. Off-body kinematics near the cylinder are also studied as a basis for the mid-field formulation. A truncated floating cylinder is used to test the mid-field formulation applied for the vertical drift force. It is found that the drift force calculated by the pressure integration method matches well with the result obtained by the mid-field formulation when the sharp corner at the bottom is properly refined. Two ship models are then used to test the meshing strategy towards the waterline for second-order forces using both the near-field and mid-field methods. Recommendations are provided for meshing strategies on wetted hulls for boundary element method codes applied to low frequency second-order problems.