HYDRODYNAMIC RESISTANCE OF TOWED CABLES

The hydrodynamic resistance on a towing cable is formulated on the basis of the independence principle which deduces that the chordwise viscous flow around a yawed cylinder is independent of the spanwise flow. The total resistance is resolved into the normal and the tangential resistances, respectively normal and tangential to the cable axis. The formulas of the normal and the tangential resistances can be universally applied to cables of any cross-sectional shape, and, for a given shape, require some empirical relationships that can be directly and conveniently obtained with a minimum of testing in a wind tunnel. This feature is attributable to the fact that the normal and the tangential resistances are expressed solely as functions of the Reynolds number based on the velocity component perpendicular to the axis of the cable. Working formulas for circular cables, derived from the universal formulas, yield values of the resistances that agree well with limited experimental data.

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