Speaker
Description
Since dynamic offshore power cable configurations incorporate buoyancy elements, it is essential to understand their forces and flow characteristics. This study investigates the stepped cylinder resembling such a configuration, where the buoyancy element has a sharp, chamfered, or filleted edge. The numerical simulations use the Partially Average Navier Stokes (PANS) turbulence model. Its accuracy is validated against experimental findings of a wall-mounted cantilever cylinder. The numerical results reveal that the attached buoyancy element reduces the drag experienced by the power cable near the junction. The forces and flow patterns are affected by the edge design of the buoyancy module. Sharp edges upstream of the power cable caused a significant separation of fluid. However, this separation was notably reduced by reshaping the edges into chamfers and fillets. Furthermore, the study highlights the complex vortex interaction that occurs due to merging two cylinders, resulting in the formation of a junction vortex and edge vortex stream. Buoyancy elements with the chamfered and filleted corners influence the flow structure by reducing the intensity of the edge vortices.
| Conference Topic Areas | Track1: Wind Engineering and Industrial Aerodynamics |
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