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Publications
Liu, ZC., Li, HT., Pei, YG. and Guedes Soares, C. (2025), Experimental investigation of towing forces on gravity cage models in calm water and regular waves, Ocean Engineering, Vol. 342, 123157.
This study investigates experimentally drag forces on gravity cage models in calm water and regular wave conditions to understand the impact of currents and waves on these structures. Two cage models, differing in bottom ring weight, are tested in a towing tank under varying towing speeds and a range of regular wave conditions. Load sensors and cameras measure drag forces and cage deformation. Results show that drag forces increase with current velocity in calm water. In wave conditions, mean drag forces are generally higher than in calm water, with short waves generating larger drag than long waves. The model with the heavier bottom ring exhibits greater drag due to reduced deformation. Wave height and steepness also influence drag, especially for short waves, with higher waves leading to larger drag amplitudes. At last, the study acknowledges limitations related to scaling effects of net material, manufacturing inconsistencies, and maintaining consistent wave conditions, factors contributing to experimental uncertainties. It emphasizes the need for further study of the fluid field around cages and improved experimental methods to address identified limitations and uncertainties.
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