The effect of appendages on the hydrodynamic characteristics of an underwater vehicle near the free surface

•The CFD is a powerful tool to obtain resistance characteristics of a submarine moving near the free surface of water.•The appendages cause an increase of 14.5% – 22.3% on total resistance of a submarine.•The appendages have a minor effect on the wave making resistance and the generated wave form of...

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Bibliographic Details
Published in:Applied ocean research 2017-09, Vol.67, p.31-43
Main Authors: Shariati, S. Khalil, Mousavizadegan, S. Hossein
Format: Article
Language:English
Subjects:
Autonomous underwater vehicles
Computational fluids dynamics
DARPA SUBOFF
Fluid mechanics
Free surface
Hydrodynamic resistance
Hydrodynamics
Sails
Submergence
Underwater vehicles
Viscosity
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Summary:•The CFD is a powerful tool to obtain resistance characteristics of a submarine moving near the free surface of water.•The appendages cause an increase of 14.5% – 22.3% on total resistance of a submarine.•The appendages have a minor effect on the wave making resistance and the generated wave form of a submarine.•The Viscous pressure resistance is strongly affected by appendages. An underwater vehicle typically has various appendages such as sail, rudders and hydroplanes. These appendages affect the hull hydrodynamic characteristics, including the resistance components and the form of the generated wave due to the motion of the vehicle near the free surface. The effect of the appendages on the hydrodynamic characteristics of an underwater vehicle near the free surface is studied. Initially the DARPPA SUBOFF submarine without the appendages is selected and hydrodynamic characteristics, including the friction resistance, viscous pressure resistance, wave resistance and shape of the created wave on the free surface are calculated for Froude numbers in the range of 0.128–0.84 and non-dimensional submergence depths 1.3, 2.2, 3.3 & 4.4. Then, by adding the appendages and comparing these two conditions, the effect of appendages is obtained. The results of computations indicate that the appendages cause a mean increase of about 16% in the total resistance. This increment is due to viscosity of fluid and also the interaction of the main hull with the appendages. There are no significant changes in the wave pattern and wave making resistance due to the presence of appendages.
ISSN:0141-1187
1879-1549
DOI:10.1016/j.apor.2017.07.001