Abstract
The present paper aims to explore and gain more knowledge about the viscosity effect on a shallowly submerged UV hydrodynamics. For this purpose, the hydrodynamic drift tests are performed on the generic SUBOFF UV geometry using URANS equations with a Reynolds stress turbulence model and Euler equations available in the commercial code STARCCM+. The simulations are conducted for drift angles ranging from β=0 to β=18.11∘ at a Froude number equal to Fn=0.512 in two different scenarios: with and without the presence of the free surface. The simulations with the presence of the free surface are performed using both URANS and Euler equations at a submergence depth h=1.1D (D: UV maximum diameter), while the simulations without the presence of the free surface are carried out using only the URANS equations. Although the Euler simulations appear to predict reasonably well the free surface contribution to the axial and lateral forces acting on the UV, further analysis of the results reveals that, generally, the viscosity has a non-negligible influence on the UV hydrodynamics and, consequently, on the loads acting on the UV. This is true even at zero incidence with respect to the incoming flow, where the Euler simulations are expected to provide satisfactory results due to the absence of large flow separation over the UV.
Published Version
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