Abstract
An experimental wind-tunnel investigation has been conducted to determine the aero/hydrodynamic characteristics of bluff symmetrical sections with high thickness/chord ratios. The sections are used as fairings for circular cylindrical members, such as towing cables and offshore drilling rig riser pipes, which are deeply immersed in the ocean environment so that they are cavitation free. The fairings serve to reduce drag and lateral vibrations due to vortex shedding. The section tested had a 40% thickness/chord ratio and was designed for a Stratford pressure recovery. Measurements included the two-dimensional drag coefficient, chordwise neutral stability point, yaw torque about the pivot center, and boundary-layer transition and separation location.
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