Print Email Facebook Twitter Near-wake flow simulation of a vertical axis turbine using an actuator line model Title Near-wake flow simulation of a vertical axis turbine using an actuator line model Author Mendoza, Victor (Uppsala University) Bachant, Peter (WindESCo Inc., Boston) Ferreira, Carlos (TU Delft Wind Energy) Goude, Anders (Uppsala University) Date 2019 Abstract In the present work, the near-wake generated for a vertical axis wind turbine (VAWT) was simulated using an actuator line model (ALM) in order to validate and evaluate its accuracy. The sensitivity of the model to the variation of the spatial and temporal discretization was studied and showed a bigger response to the variation in the mesh size as compared with the temporal discretization. The large eddy simulation (LES) approach was used to predict the turbulence effects. The performance of Smagorinsky, dynamic k-equation, and dynamic Lagrangian turbulence models was tested, showing very little relevant differences between them. Generally, predicted results agree well with experimental data for velocity and vorticity fields in representative sections. The presented ALM was able to characterize the main phenomena involved in the flow pattern using a relatively low computational cost without stability concerns, identified the general wake structure (qualitatively and quantitatively), and the contribution from the blade tips and motion on it. Additionally, the effects of the tower and struts were investigated with respect to the overall structure of the wake, showing no significant modification. Similarities and discrepancies between numerical and experimental results are discussed. The obtained results from the various simulations carried out here can be used as a practical reference guideline for choosing parameters in VAWTs simulations using the ALM. Subject actuator line modeldynamic stall modelnear wake simulationvawtvertical axis wind turbine To reference this document use: http://resolver.tudelft.nl/uuid:9fc743f8-255a-40c4-8f0f-a13b902b58c3 DOI https://doi.org/10.1002/we.2277 Embargo date 2020-02-01 ISSN 1095-4244 Source Wind Energy, 22 (2), 171-188 Part of collection Institutional Repository Document type journal article Rights © 2019 Victor Mendoza, Peter Bachant, Carlos Ferreira, Anders Goude Files PDF paper.pdf 18.46 MB Close viewer /islandora/object/uuid:9fc743f8-255a-40c4-8f0f-a13b902b58c3/datastream/OBJ/view