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Feb 17, 2025Keywords:
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CFD based analysis of drag forces on twin submerged floating tubes
Abstract
Twin submerged floating tubes (Twin-SFT) are widely found in structural applications, e.g. underwater cables, piping systems, even recently a lot of research has been directed towards transport tunnels. Currently, research on Twin-SFT is still limited and far behind when compared to single tubes. This research aims to observe the drag force on Twin-SFT. The study investigates the effect of the axis distance between the tubes, the diameter, and the depth of the installation of the double-tube structure on the drag force. The diameter variations of the tubes are 2 in (50.8 mm), 2 ½ in (63.5 mm) and 3 in (76.2 mm), each with a length of 600 mm. The tubes were mounted parallel to the centre distance between the upstream and downstream cylinders at x/L = 1⁄4, x/L = 1⁄2, x/L = 3⁄4 and x/L = 1, where x/L is the ratio of distance to wavelength (L). To assess the influence of the installation depth, the tubes were mounted at depths of 100 mm and 200 mm. The results showed that the drag forces on both cylinders were smallest at a distance of x/L = 1⁄4. Additionally, as the tube’s depth increases, the drag force decreases, while larger tube diameters result in greater drag force.
