Session: 08-06-01 non-presentations

Paper Number: 127268

127268 - The Effect of the Free Surface on a Full-Scale Submarine in Real Sea Waves Conditions With Different Depths 

 

In this study, the effect of the free surface on the resistance and propulsion performances of a full-scale submarine was analyzed at various depths (d/D=1.1, 2.2, 3.3) in real sea areas off the east coast of Korea. For this analysis, the computational fluid dynamics (CFD) software, open-source field operator and manipulator (OpenFOAM) was utilized to carry out the CFD analysis of the submarine. Additionally, the volume of fluid (VOF) method was used to perform the analysis of multi-phase flow where the free surface was present, and waves2Foam a solver within OpenFOAM was used to show the propagation of waves. A generic submarine Joubert BB2 was selected which was operated by the Maritime Research Institute Netherlands (MARIN). To comprehend the influence of the free surface on the submarine in actual maritime conditions, the analysis was conducted using the full-scale submarine length of 70.2m. Since the waves in the actual sea areas are fundamentally irregular and comprised of component waves propagating in multiple directions, this was considered in the analysis by simulating irregular waves where several component waves were overlapped. Under such wave conditions, the resistance analysis of the submarine was carried out according to the different depths. Also, the hydrodynamic characteristics such as pressure, velocity, and vorticity were compared to verify the influence of the free surface. As a result, this study confirmed that the free surface has a significant impact on the resistance and propulsion performance of the submarine. These results suggest that the effect of the free surface at various depths must be considered in the design and operation process of the submarine.

Presenting Author: Junyoung Park Pukyong National University

Presenting Author Biography: Junyoung Park is currently a M.S. student in the Department of Marine Convergence Design Engineering at Pukyong National University. He graduated in naval architecture and marine system engineering from Pukyong National University. His research focuses on CFD and EFD, and he is a member of the Society of Naval Architects of Korea and the Korean Society of Computational Fluids Engineering. In the CFD field, analysis of ships and submarines is performed using various programs such as OpenFOAM, and in the EFD field, he is conducting experiments on waves in the Pukyong National University towing tank. Recently, he wrote a paper on a fundamental study on efficient generation of regular waves for the development of a virtual ocean basin in the Korean Society of Computational Fluids Engineering.

Authors:

Junyoung Park Pukyong National University
Woochan Seok Pukyong National University