The application of a 3-dimensional Lagrangian vortex particle method has beenassessed for modelling the near-wake of an axisymmetrical actuator disc and 3-bladed horizontal axis wind turbine with prescribed circulation from the MEXICO (Model EXperiments InCOntrolled conditions) experiment. The method was developed in the framework of the open-source Parallel Particle-Mesh library for handling the efficient data-parallelism on a CPU (Central Processing Unit) cluster, and utilized a O(N log N)-type fast multipole method for computational acceleration. Simulations with the actuator disc resulted in a wake expansion, velocity deficit profile, and induction factor that showed a close agreement with theoretical, numerical, and experimental results from literature. Also the shear layer expansion was present; the Kelvin-Helmholtz instability in the shear layer was triggered due to the round-of limitations of a numerical method, but this instability was delayed to beyond 1 diameter downstream due to the particle smoothing. Simulations with the 3-bladed turbine demonstrated that a purely3-dimensional flow representation is challenging to model with particles. The manifestation of local complex flow structures of highly stretched vortices made the simulation unstable, but this was successfully counteracted by the application of a particle strength exchange scheme. The axial and radial velocity profle over the near wake have been compared to that of the original MEXICO experiment, which showed close agreement between results.
|Book series||Journal of Physics: Conference Series (Online)|
|Number of pages||13|
|Publication status||Published - 2016|
|Event||The Science of Making Torque from Wind 2016 - Technische Universität München (TUM), Munich, Germany|
Duration: 5 Oct 2016 → 7 Oct 2016
Conference number: 6
|Conference||The Science of Making Torque from Wind 2016|
|Location||Technische Universität München (TUM)|
|Period||05/10/2016 → 07/10/2016|
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