Abstract
In the present paper, CFD investigation is performed in order to analyze the effect of angle of attack and strut arrangement within towing tank facility on prediction of the hydrodynamic drag of an autonomous underwater vehicle. Single and two phase calculations basing on Reynolds Averaged Navier–Stokes (RANS) equations were solved using ANSYS FLUENT in order to analyze the effect of free surface on flow features. Therefore, the results were compared with experimental ones provided from a captive model in towing tank tests. The study is accomplished at the depth of 4 of the AUV diameter over various angles of attack from 0° to 15° and different velocity ranging from 0.4m/s to 1.4 m/s. The integration of strut arrangement in CFD analysis shows a significant effect on the hydrodynamic characterization of the hull especially with high incidence. Also, the sensitivity of the free surface to aft body deviation of the AUV has relatively affected the measurement of drag forces.
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