Abstract
Two dimensional numerical analysis of Darrieus turbine is carried out with an Unsteady Reynolds-Averaged Navier-
Stokes (URANS) equation and a structured mesh configuration using overset grid approach. It is confirmed that the calculations
are in agreement with the experimental results for the tip speed ratio more than two at which the maximum power
coefficient is obtained by the experiment. It is possible to solve the flow field around the turbine by the URANS in reasonable
calculation time and the result practical enough is obtained in the flow field where the tip speed ratio is comparatively
high and the separation is small.
