EllipSys3D large eddy simulation data of single wind turbine wakes in neutral atmospheric conditions

This data set represents transient velocity fields obtained by large eddy simulations (LES) of a wind turbine wake, for two different ambient turbulence intensities (4% and 12.8%). EllipSy3D [1-3], the in-house flow solver of DTU Wind Energy, is used to compute the LES data. The complete setup and post processed data are described in:<br><br>http://onlinelibrary.wiley.com/doi/10.1002/we.1736/pdf<br>http://iopscience.iop.org/article/10.1088/1742-6596/1037/7/072001/pdf<br><br>The average flow field is published as Cases 5 and 6 in the first article, corresponding to a low and high ambient turbulence intensity. Two additional LES data sets are added (*_NoAD_*.nc), where the wind turbine model is switched off so one can isolate the wake effect.<br><br>More specific info:<br>- The NREL-5MW rotor is modeled as an actuator disk with a fixed force distribution that does not change with time. The force distribution is based on a rotor resolved detached eddy simulation. The rotor diameter D is 126 m.<br>- The coordinate system is: x=streamwise, y=lateral and z=height.<br>- The LES data is extracted from a plane at hub height (z=90 m) with:<br>a) Spatial dimensions x=-1D,8.5D and y=-2D,2D (actuator disk is located at (x,y,z) = (0, 0, 90) m,<br>b) Spatial sample resolution is D/30 (4.2 m). The numerical grid is twice as fine (D/60).<br>c) Temporal sample resolution is 0.24 s.<br>d) Each plane has 286x121 = 34606 spatial points.<br>e) 15500 planes are stored per case.<br>- The averaged freestream hub height velocity is close to 8 m/s.<br><div>- Inflow turbulence is modeled by the Mann model.</div><div>- Each case corresponds to 1 hour LES. This duration is long enough to get converged mean velocity fields for the low ambient turbulence case. However, the high ambient turbulence case could be improved by running a longer LES because the mean streamwise velocity field in the far wake is still asymmetric, where a symmetric mean streamwise velocity field would be expected.</div><div>- The filenames *_UWV_* should have been called *_UVW_*.<br></div><br>An example Python script, read_netcfd_and_plot.py, is provided which can read and plot the LES data. <br><br><div>For questions, please contact: Paul van der Laan, plaa@dtu.dk</div><div><br></div><div>EllipSys3D references:</div><div><br></div><div><a>1</a>: Michelsen, J. A., <em>Basis3D - a Platform for Development of Multiblock PDE Solvers</em>, AFM 92-05, Department of Fluid Mechanics, Technical University of Denmark, December 1994.<br> <a>2</a>: Michelsen, J. A., Block structured Multigrid solution of 2D and 3D Elliptic PDEs, AFM 94-06, Department of Fluid Mechanics, Technical University of Denmark, May 1994.<br> <a>3</a>: Sørensen, N. N., <em>General Purpose Flow Solver Applied to Flow Over Hills</em>, Risø-R-827, Risø National Laboratory, Roskilde, Denmark, 1995.</div>