Hydrodynamic analysis of tow cable has an important role in the design of towed system. Cable catenary, cable depth attained for a given cable length, cable tension and angle of cable with the body are the parameters that affects the towed system related to tow cable. This paper deals with analysis of a set of commercially available cables of different properties using Orcaflex software. The cables were analysed for different payouts at different speeds. A comparative study was performed on the results obtained relating the cable properties (diameter and buoyancy). This provides a rough idea on the catenary profiles that reflects the depth and trail achieved by the cable given payout and speed.
The prediction of hydrodynamic performance of AUV is essential during the early stages of design for the efficient modeling of the AUV. This paper discusses the use of semi-empirical equations developed for airship hulls by various researchers in the field of aerodynamics, on the axisymmetric AUV bare hull at different angles of attack. Three hulls of varying length-to-diameter (L/D) ratios are selected for the study. The results obtained from the semi-empirical equations are compared with the available experimental results and also with the results obtained from the numerical analysis carried out using the CFD code -STAR CCM+.
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