Investigations into the Interaction of a Wind Turbine with Atmospheric Turbulence in Complex Terrain

This paper deals with the Delayed-Detached-Eddy-Simulations (DES) of a generic 2.4 MW wind turbine in a complex terrain site facing a turbulent atmospheric boundary layer. The boundary layer is generated based on measurement data derived at the complex terrain site. Further, the process of data preparation as well as the numerical setup are described. In the results the impact of complex terrain on the flow field is shown and estimations on the influence on the turbine performance are made. Afterwards, simulations of the turbine facing atmospheric inflow in flat and complex terrain are presented. An increase of loads resulting from a speed-up caused by the terrain as well as a clear change in the power spectrum of the turbine become visible in complex terrain compared to flat terrain. This finding is in agreement with the estimations derived previously. Moreover, the impact of inclined inflow caused by the local terrain slope can be seen in the load distribution vs. the azimuth angle, amongst others.

[1]  J L Steger,et al.  Chimera. A Grid-Embedding Technique , 1986 .

[2]  Chi-Wang Shu,et al.  Efficient Implementation of Weighted ENO Schemes , 1995 .

[3]  N. Troldborg,et al.  A simple atmospheric boundary layer model applied to large eddy simulations of wind turbine wakes , 2014 .

[4]  Shan Guang-Jiang,et al.  EFFICIENT IMPLEMENTATION OF WEIGHTED ENO SCHEMES , 1995 .

[5]  Ewald Krämer,et al.  CFD Studies on Wind Turbines in Complex Terrain under Atmospheric Inflow Conditions , 2014 .

[6]  Ewald Krämer,et al.  CFD study on the impact of yawed inflow on loads, power and near wake of a generic wind turbine , 2017 .

[7]  G. Bergeles,et al.  Notes on Numerical Fluid Mechanics and Multidisciplinary Design , 2012 .

[8]  H. Jørgensen,et al.  The Bolund Experiment, Part I: Flow Over a Steep, Three-Dimensional Hill , 2011 .

[9]  S. Osher,et al.  Weighted essentially non-oscillatory schemes , 1994 .

[10]  Luca Delle Monache,et al.  Comparison of numerical weather prediction based deterministic and probabilistic wind resource assessment methods , 2015 .

[11]  F. Fiedler,et al.  Modification of air flow over an escarpment — Results from the Hjardemål experiment , 1995 .

[12]  E. S. Politis,et al.  Modeling wake effects in large wind farms in complex terrain: the problem, the methods and the issues , 2012 .

[13]  Stefan Emeis,et al.  Wind Energy Meteorology , 2013 .

[14]  J. Mann.  Wind field simulation , 1998 .

[15]  Ewald Krämer,et al.  Simulation of a 5MW wind turbine in an atmospheric boundary layer , 2014 .

[16]  J. G. Schepers,et al.  Engineering models in wind energy aerodynamics : Development, implementation and analysis using dedicated aerodynamic measurements , 2012 .

[17]  Michael M. Resch,et al.  High performance computing in science and engineering , 2005, 17th International Symposium on Computer Architecture and High Performance Computing (SBAC-PAD'05).

[18]  Frank Thiele,et al.  The MEGAFLOW project , 2000 .

[19]  A. J. Bowen,et al.  A wind-tunnel investigation of the wind speed and turbulence characteristics close to the ground over various escarpment shapes , 1977 .

[20]  P. Spalart,et al.  A New Version of Detached-eddy Simulation, Resistant to Ambiguous Grid Densities , 2006 .

[21]  Pol D. Spanos,et al.  Probabilistic engineering mechanics , 1992 .