Abstract
The present study aims to investigate the interaction between the free surface and a semi/shallowly submerged under-water vehicle,especially when the submergence depth h is smaller than 0.75D (D:submarine maximum diameter). In this respect,the straight-ahead simulations of the generic SUBOFF underwater vehicle geometry are conducted with constant forward velocities using the Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations with a Shear-Stress Transport (SST) k-ω turbulence model in commercial code Fluent,at submergence depths and Froude numbers ranging from h=0 to h=3.3D and from Fn=0.205 to Fn=0.512,respectively. The numerical models are verified against the existing experimental data. The analysis of the obtained results indicates that in the case of the semi and shallowly submerged underwater vehicle (UV),both the submergence depth and forward velocity have a great effect on the behaviors of hydrodynamic forces acting on the UV. The magnitude of maximum total resistance may reach almost five times the value of resistance exerted on the totally submerged hull. Both the forces acting on the UV and the generated waves when the submergence depth h is smaller than 0.75D are significantly different from those whenr h is larger than 0.75D. The conclusions can be used as reference for future research on near free surface motions of underwater vehicles and the design of small water-plane area twin hull.
维普
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