论文信息 - METHOD TO PREDICT LONG TIME SPAN OF SCOUR AROUND OFFSHORE WIND TURBINE FOUNDATIONS

METHOD TO PREDICT LONG TIME SPAN OF SCOUR AROUND OFFSHORE WIND TURBINE FOUNDATIONS

A new method to predict scour development around offshore structures has been developed. The method has been tested on a monopile. The method consists of table of scour rates, which is used to predict the scour development around the structure at different stages of the scour hole. The scour rate tables have been made based on full 3D numerical simulations of the flow and sediment transport for fixed configurations of the scour hole. When changing the governing parameters which are causing the scour development around the structure, the erosion rate or backfilling rate can be calculated from the mass balance of the sediment. This leads to the scour rates tables that are used to analyses the development of the scour hole under different current conditions. The method has been tested against experimental scour data and showed very promising results.

[1] F. Menter. Improved two-equation k-omega turbulence models for aerodynamic flows , 1992 .

[2] B. Sumer,et al. Numerical and experimental investigation of flow and scour around a circular pile , 2005, Journal of Fluid Mechanics.

[3] Gary Parker,et al. A new vectorial bedload formulation and its application to the time evolution of straight river channels , 1994, Journal of Fluid Mechanics.

[4] Jørgen Fredsøe,et al. Hydrodynamics Around Cylindrical Structures , 2006 .

[5] F. Menter. ZONAL TWO EQUATION k-w TURBULENCE MODELS FOR AERODYNAMIC FLOWS , 1993 .

[6] Stanley R. Davis,et al. Evaluating scour at bridges. , 1995 .

[7] A. W. Nielsen,et al. Time-Varying Wave and Current-Induced Scour Around Offshore Wind Turbines , 2007 .

[8] C. Stam,et al. TIME-DEPENDENT SCOUR DEVELOPMENT UNDER COMBINED CURRENT AND WAVE CONDITIONS – HINDCAST OF FIELD MEASUREMENTS , 2008 .

[9] H. W. Shen,et al. Local Scour Around Cylindrical Piers , 1977 .

[10] Tim Raaijmakers,et al. Time-dependent scour development under combined current and waves conditions - laboratory experiments with online monitoring technique , 2008 .