This manuscript presents an effort towards the introduction of a new grid generation tool for computational fluid dynamics (CFD) simulations of wind turbines. The tool was developed and designed to considerably reduce the duration and complexity of the grid generation process and, moreover, to enable users to perform an efficient CFD simulation for a complete wind turbine rotor. Furthermore, the tool is fully automatized, thus enabling the user to refine the grid along the desired direction. For the purpose of validation, the quality of the generated grid was checked via a grid independence test. Finally, the grid generator tool was evaluated by means of a series of simulations of the NREL phase VI rotor using a three-dimensional CFD Reynolds averaged Navier–Stokes method. The capability of CFD simulations based on the generated grid in capturing aerodynamic performances (such as the power) and the detailed flow characteristics (e.g. the surface pressure distributions) were investigated under various conditions. The obtained results demonstrate the quality and reliability of the developed grid generation tool.
BlackerTDMeyersRJ (1993) Seams and wedges in plastering: A 3-d hexahedral mesh generation algorithm. Engineering with Computers9(2): 83–93.
3.
CelikIBGhiaURoachePJ. (2008) Procedure for estimation and reporting of uncertainty due to discretization in CFD applications. Journal of Fluids Engineering - Transactions of the ASME130(7): 1–4.
Council GWE (2009) Global wind 2009 report. Technical report, GWEC Global Wind Energy Council (GWEC).
6.
DanieleE (2014) 3D steady simulation of a 7.5 mW wind turbine with OpenFOAM. In: 10th European Fluid Mechanics Conference, Copenhagen, Denmark, September 2014.
7.
FarrellPMaddisonJ (2011) Conservative interpolation between volume meshes by local galerkin projection. Computer Methods in Applied Mechanics and Engineering200(1–4): 89–100.
FornbergB (1988) Generation of finite difference formulas on arbitrarily spaced grids. Mathematics of Computation51(184): 699–706.
11.
HandMMSimmsDFingershL. (2001) Unsteady aerodynamics experiment phase vi: wind tunnel test configurations and available data campaigns. Technical report, National Renewable Energy Laboratory, USA.
12.
HughesTJCottrellJABazilevsY (2005) Isogeometric analysis: Cad, finite elements, nurbs, exact geometry and mesh refinement. Computer Methods in Applied Mechanics and Engineering194(39): 4135–4195.
13.
LiuSSGadhR (1997) Automatic hexahedral mesh generation by recursive convex and swept volume decomposition. In: 6th International Meshing Roundtable, Sandia National Laboratories, Park City, UT, 13–15 October, pp.217–231.
MenterFR (1992) Performance of popular turbulence models for attached and separated adverse pressure gradient flows. AIAA Journal30(8): 2066–2072.
16.
MichelsenJ (1992) Basis3d-a platform for development of multiblock pde solvers. Technical Report AFM 92-05, Technical University of Denmark, Lyngby, Denmark.
17.
MoJOLeeYH (2012) Cfd investigation on the aerodynamic characteristics of a small-sized wind turbine of nrel phase vi operating with a stall-regulated method. Journal of Mechanical Science and Technology26(1): 81–92.
18.
MoJOChoudhryAArjomandiM. (2013) Large eddy simulation of the wind turbine wake characteristics in the numerical wind tunnel model. Journal of Wind Engineering and Industrial Aerodynamics112(0): 11–24.
19.
NeittaanmäkiPRossiTMajavaK. (2004) A verification exercise for two 2-d steady incompressible turbulent flows. Proceedings of the ECCOMAS, Jyväskylä, Finland, 24–28 July, pp.1–20.
20.
NREL (2015) Wind research home page. Available at: http://www.nrel.gov/wind/ (accessed 29 July 2015).
21.
OpenCFD (2015) OpenFOAM - the open source computational fluid dynamics (cfd) toolbox. Available at: http://OpenFOAM.com (accessed 29 July 2015).
22.
OwenSJSaigalS (2000) H-morph: An indirect approach to advancing front hex meshing. International Journal for Numerical Methods in Engineering49(1–2): 289–312.
23.
PriceMAArmstrongCGSabinM (1995) Hexahedral mesh generation by medial surface subdivision: Part i. solids with convex edges. International Journal for Numerical Methods in Engineering38(19): 3335–3359.
SongYPerotJ (2015) Cfd simulation of the nrel phase vi rotor. Wind Engineering39(3): 299–310.
29.
SørensenNNMichelsenJSchreckS (2002) Navier–stokes predictions of the nrel phase vi rotor in the nasa ames 80 ft × 120 ft wind tunnel. Wind Energy5(2-3): 151–169.
30.
StegerJLSorensonRL (1980) Use of hyperbolic partial differential equations to generate body fitted coordinates. NASA, Langley Research Center Numerical Grid Generation Tech, pp.463–478 (SEE N 81-14690 05-64).
31.
TendulkarSBeallMShephardMS. (2011) Parallel mesh generation and adaptation for cad geometries. In: Proceedings of the NAFEMS world congress, Boston, MA, 23–26 May, pp.2011–2012.
32.
WilcoxD (1991) A half century historical review of the k-w model. In: 29th Aerospace Sciences Meeting, AIAA, Reno, NV, 7–10 January 1991, vol. 91, pp.2066–2072.
33.
YelmuleMMVSJEA (2013) CFD predictions of NREL phase VI rotor experiments in NASA/AMES wind tunnel. International Journal of Renewable Energy Research3(2): 261–270.
