ABSTRACT 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...
moreABSTRACT
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 pre-
sented. 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 (sta-
tionary) 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.
