The Structured and Unstructured CFD Characteristic Studies of 3-D Backward Wind Turbine Blades.

The paper would report the aerodynamic CFD model characteristic studies of backward 3-D wind turbine blades in operation. It is found that the blade lip of the bottom section is suffered from strongly decelerated disturbance, while the upper section are accelerated. The region influenced by radial disturbance starts radially from the top toward the bottom part of the blade, from lightly disturbed to weakly disturbed region. Original radial source of disturbance, caused by centrifugal and Corriolis force, are still persist. Q-criterion was used to benchmark for the quality of computation to justify the most sensitive outcome, to determine the largest size for the smallest computational cell. Compare to structured grids, the unstructured grids gives significant results errors. [ABSTRACT FROM AUTHOR]