A concurrent precursor inflow method for Large Eddy Simulations and applications to finite length wind farms

In order to enable simulations of developing wind turbine array boundary layers with highly realistic inflow conditions a concurrent precursor method for Large Eddy Simulations is proposed. In this method we consider two domains simultaneously, i.e. in one domain a turbulent Atmospheric Boundary Layer (ABL) without wind turbines is simulated in order to generate the turbulent inflow conditions for a second domain in which the wind turbines are placed. The benefit of this approach is that a) it avoids the need for large databases in which the turbulent inflow conditions are stored and the correspondingly slow I/O operations and b) we are sure that the simulations are not negatively affected by statically swept fixed inflow fields or synthetic fields lacking the proper ABL coherent structures. Sample applications are presented, in which, in agreement with field data a strong decrease of the power output of downstream wind-turbines with respect to the first row of wind-turbines is observed for perfectly aligned inflow.

[1]  N. Jensen.  A note on wind generator interaction , 1983 .

[2]  C. Meneveau,et al.  Large eddy simulation study of fully developed wind-turbine array boundary layers , 2010 .

[3]  J. Højstrup,et al.  A Simple Model for Cluster Efficiency , 1987 .

[4]  Charles Meneveau,et al.  A scale-dependent Lagrangian dynamic model for large eddy simulation of complex turbulent flows , 2005 .

[5]  P. Mason.  Large‐eddy simulation: A critical review of the technique , 1994 .

[6]  J. Michalakes,et al.  A Numerical Study of Atmospheric and Wake Turbulence Impacts on Wind Turbine Fatigue Loadings , 2013 .

[7]  F. Porté-Agel,et al.  Simulation of Turbulent Flow Inside and Above Wind Farms: Model Validation and Layout Effects , 2012, Boundary-Layer Meteorology.

[8]  A. Crespo,et al.  Comparison of turbulence models for the computational fluid dynamics simulation of wind turbine wakes in the atmospheric boundary layer , 2011 .

[9]  E. S. Politis,et al.  Modelling and Measuring Flow and Wind Turbine Wakes in Large Wind Farms Offshore , 2009, Renewable Energy.

[10]  J. F. Ainslie,et al.  CALCULATING THE FLOWFIELD IN THE WAKE OF WIND TURBINES , 1988 .

[11]  C. Moeng.  A Large-Eddy-Simulation Model for the Study of Planetary Boundary-Layer Turbulence , 1984 .

[12]  Stefano Leonardi,et al.  A large-eddy simulation of wind-plant aerodynamics , 2012 .

[13]  M. Parlange,et al.  Large eddy simulation study of scalar transport in fully developed wind-turbine array boundary layers , 2011 .

[14]  M. Nielsen,et al.  Linearised CFD Models for Wakes , 2011 .

[15]  Jason Jonkman,et al.  Atmospheric and Wake Turbulence Impacts on Wind Turbine Fatigue Loading: Preprint , 2012 .

[16]  Stefan Ivanell,et al.  Numerical computations of wind turbine wakes , 2007 .

[17]  Charles Meneveau,et al.  Modeling turbulent flow over fractal trees with renormalized numerical simulation , 2005, J. Comput. Phys..

[18]  Ervin Bossanyi,et al.  Wind Energy Handbook , 2001 .

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

[20]  B. Koren,et al.  Review of computational fluid dynamics for wind turbine wake aerodynamics , 2011 .

[21]  F. Sotiropoulos,et al.  Computational study and modeling of turbine spacing effects in infinite aligned wind farms , 2012 .

[22]  P. R. Spalart,et al.  Direct numerical study of leading-edge contamination , 1989 .

[23]  A. Crespo,et al.  Advances in large-eddy simulation of a wind turbine wake , 2007 .

[24]  Antonino Ferrante,et al.  A robust method for generating inflow conditions for direct simulations of spatially-developing turbulent boundary layers , 2004 .

[25]  C. Meneveau,et al.  Effect of downwind swells on offshore wind energy harvesting – A large-eddy simulation study , 2014 .

[26]  Stefan Ivanell,et al.  Validation of methods using EllipSys3D , 2008 .

[27]  E. S. Politis,et al.  Flow and wakes in large wind farms: Final report for UpWind WP8 , 2011 .

[28]  T. Lund,et al.  Generation of Turbulent Inflow Data for Spatially-Developing Boundary Layer Simulations , 1998 .

[29]  J. Michalakes,et al.  A numerical study of the effects of atmospheric and wake turbulence on wind turbine dynamics , 2012 .

[30]  J. Sørensen,et al.  Wind turbine wake aerodynamics , 2003 .

[31]  Julio Hernández,et al.  Survey of modelling methods for wind turbine wakes and wind farms , 1999 .

[32]  Pierre-Elouan Réthoré,et al.  Wind Turbine Wake in Atmospheric Turbulence , 2009 .

[33]  F. Porté-Agel,et al.  Large-Eddy Simulation of Wind-Turbine Wakes: Evaluation of Turbine Parametrisations , 2011 .

[34]  Nikolaus A. Adams,et al.  A windowing method for periodic inflow/outflow boundary treatment of non-periodic flows , 2005 .

[35]  C. Meneveau,et al.  Large Eddy Simulations of large wind-turbine arrays in the atmospheric boundary layer , 2010 .

[36]  Gavin Tabor,et al.  Inlet conditions for large eddy simulation: A review , 2010 .