Print Email Facebook Twitter 3D Lagrangian VPM Title 3D Lagrangian VPM: Simulations of the near-wake of an actuator disc and horizontal axis wind turbine Author Berdowski, T.J. (TU Delft Wind Energy) Ferreira, Carlos (TU Delft Wind Energy) Walther, J. (Technical University of Denmark) Date 2016 Abstract The application of a 3-dimensional Lagrangian vortex particle method has been assessed 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 In COntrolled 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-off 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 purely 3-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 profile over the near wake have been compared to that of the original MEXICO experiment, which showed close agreement between results. To reference this document use: http://resolver.tudelft.nl/uuid:5f7396d3-4754-4bcb-8b86-17ac73cbd0af DOI https://doi.org/10.1088/1742-6596/753/3/032004 ISSN 1742-6588 Source Journal of Physics: Conference Series, 753 Event TORQUE 2016: 6th International Conference "The Science of Making Torque from Wind", 2016-10-05 → 2016-10-07, Technische Universität München (TUM), Campus Garching, Munich, Germany Part of collection Institutional Repository Document type journal article Rights © 2016 T.J. Berdowski, Carlos Ferreira, J. Walther Files PDF Berdowski_2016_J._Phys._3 ... 032004.pdf 1.85 MB Close viewer /islandora/object/uuid:5f7396d3-4754-4bcb-8b86-17ac73cbd0af/datastream/OBJ/view