Speaker
Description
The rapid expansion of offshore wind has increased the demand for reliable scour protection systems to ensure the long-term stability of turbine foundations. Rip-rap scour protections are widely used to mitigate local scour around monopiles. However, edge scour can develop around the protection perimeter, compromising stability and increasing maintenance costs. Optimising scour protection design therefore requires accurate prediction of edge scour. CFD modelling offers a promising approach, but its application remains limited by the calibration of key model parameters. For instance, in the TUDFlow3D framework (de Wit, 2015), previous results have shown an overprediction not only in the depth of the edge scour hole but also in the slope of the bathymetry. This study focused on the assessment of the influence of CDF parameters, such as MORFAC and avalanche slope angle, on the edge scour prediction. A set of 27 simulations have been conducted in Deltares cluster facilities, to better calibrate and validate the model against physical modelling results from Deltares in-house experiments and results reported in Petersen et al. (2015).
The calibration process successfully mitigated edge scour overprediction using a geomechanical parameterisation of the avalanche slope angle. Additionally, a threshold was identified at a mobility ratio of 71 (bed-to-berm mobility parameter ratio). Numerical results proved accurate near this value but led to mispredictions when deviating far from it.
The findings of this study provide guidance for the selection and calibration of TUDFlow3D numerical models to predict edge scour around offshore scour protections.
| Topic Area | Advanced Computational Methods and Applications in Marine, Subsea and Offshore Technology |
|---|