A summary of the core computational algorithm of the Discrete Element Model (DEM) FLOWER code, which was developed by implementing Newton’s original “discrete” Moving-Material-Domain (MMD) concepts, as the EDAN (Euler Domain Assimilated Newtonian) formalism, was presented. New generation DEM code AERO-FLOWER was used for the simulation of fast-transient air-flow conditions over three selected blade-sections (NACA 4424, NACA 4421, DU 00-W2-401) of an AEOLUS II wind-turbine blade. For each blade-section, simulations were started from parked-blade (stationary) conditions, with the oncoming wind velocity considered as 10m/s or 20m/s, along the rotor-axis (zero yaw). The tangential-velocity conditions were started as 0m/s, and were increased, intermittently, as 10m/s, 20m/s, and 40m/s, until the Torque Termination Limit (TTL). The results for tangential-force and normal-force coefficients clearly indicated the continuous presence of gradually weakening, but persistent, fast-transient characteristics of the dynamic-stall regimes, which verified the critical need for Shedding-Eddies Simulation (SES) capabilities.
DEM Computational Modeling of Flow Over Wind-Turbine Sections Under Varying Wind Speed and Direction Conditions
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Eraslan, AH, Erturk, RF, & Onbasioglu, S. "DEM Computational Modeling of Flow Over Wind-Turbine Sections Under Varying Wind Speed and Direction Conditions." Proceedings of the ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 1. Istanbul, Turkey. July 12–14, 2010. pp. 319-328. ASME. https://doi.org/10.1115/ESDA2010-25314
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