The Modeling Of A Numerical Wave-tank And Investigations On The Seaworthy Of A Submarine With Experimental And Numerical Methods

Numerical simulation technology is an emerging field. With the rapid development of computer's calculation speed,numerical simulation technology gradually shows its strong advantage. Today in the field of naval architecture and ocean engineering, numerical simulation technology has become an indispensible method to solve the interaction between waves and ocean structures. With so many outstanding advantages, such as low-cost, no scale effect and obtaining accurate information of the fluid field, using numerical simulation to solve the problem is the major trend.The hydrodynamic characteristics of submerged object near the free-surface in waves that has important significance for designing and depth controlling of the submerged objects and submarine. In this paper, the writer established 2D and 3D numerical wave tank based on the CFD techniques, and analyzed the wave forces of the submerged objects near the free-surface in waves. Finally, the submarine self-propelled model test near the free-surface in waves was completed. The following work has been completed in this paper:1. Numerical simulation of linear waves inside a 2D viscous numerical wave tank is carried out. The governing equations, Reynolds Averaged Navier - Stokes (RANS) and continuity equations are discretized by finite volume method (FVM). The VOF method of Geo-Reconstruct scheme is adopted to deal with the free surface. The incident waves are generated from the inflow boundary by velocity inlet, and the outgoing waves are dissipated inside an artificial damping zone located at the rear part of the wave tank.2. According to the theory of the 2D numerical wave tank established a 3D numerical wave tank , and the hydrodynamics of submerged ellipsoid fixing near the free-surface at zero speed in regular waves were calculated. The results of numerical simulation are compared with potential theoretical results. The results showed that the method was effective on the numerical computation of hydrodynamic forces caused by the submerged object near the free-surface, it gives reference for designing and depth controlling of the submerged objects and submarine. Finally, in the end of the third chapter, this paper has calculated the SUBOFF submarines' hydrodynamics near the surface, and the results agree with the front.3. In this paper, we use the dynamic meshes in FLUENT to simulate the objects' free movement in waves. We also started to research and explore with the 2D motion of a submerged object, then extend the theories to 3D objects. The writer has been simulated the simple symmetric objects' free movement near the free surface.4. Finally, the submarine self-propelled model test near the free-surface in waves was taken, which certifies the results of the numerical simulation. And it also shows that numerical simulation methods can achieve submerged objects experiments in waves. Numerical simulation technology can be able to simulate the experiment environment and get the whole information of the fluid field convenience and quickly. I believe the numerical wave tank simulation technology will replace the model experiments in the future.