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 Mahmoud Salari,Amin Rava.Numerical Investigation of Hydrodynamic Flow Over an AUV Moving in the Water-surface Vicinity Considering the Laminar-turbulent Transition[J].Journal of Marine Science and Application,2017,(3):298-304.[doi:10.1007/s11804-017-1422-x]
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Numerical Investigation of Hydrodynamic Flow Over an AUV Moving in the Water-surface Vicinity Considering the Laminar-turbulent Transition


Numerical Investigation of Hydrodynamic Flow Over an AUV Moving in the Water-surface Vicinity Considering the Laminar-turbulent Transition
Mahmoud Salari Amin Rava
Mahmoud Salari Amin Rava
Department of Mechanical Engineering, Imam Hossein University, Tehran 1655853548, Iran
autonomous underwater vehiclessea surface effectscomputational fluid dynamicshydrodynamicslaminar to turbulent transition
Nowadays, Autonomous Underwater Vehicles (AUVs) are frequently used for exploring the oceans. The hydrodynamics of AUVs moving in the vicinity of the water surface are significantly different at higher depths. In this paper, the hydrodynamic coefficients of an AUV in non-dimensional depths of 0.75, 1, 1.5, 2, and 4D are obtained for movement close to the free-surface. Reynolds Averaged Navier Stokes Equations (RANS) are discretized using the finite volume approach and the water-surface effects modeled using the Volume of Fraction (VOF) method. As the operating speeds of AUVs are usually low, the boundary layer over them is not fully laminar or fully turbulent, so the effect of boundary layer transition from laminar to turbulent flow was considered in the simulations. Two different turbulence/transition models were used:1) a full-turbulence model, the k-ε model, and 2) a turbulence/transition model, Menter’s Transition-SST model. The results show that the Menter’s Transition-SST model has a better consistency with experimental results. In addition, the wave-making effects of these bodies are studied at different immersion depths in the sea-surface vicinity or at finite depths. It is observed that the relevant pitch moments and lift coefficients are non-zero for these axi-symmetric bodies when they move close to the sea-surface. This is not expected for greater depths.


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Received date: 2016-12-30;Accepted date:2017-04-17。
Corresponding author:Mahmoud Salari,Amin Rava,msalari@ihu.ac.ir;Amin Rava,m.salari@gmail.com
Last Update: 2017-08-31