The result obtained from the CFD simulation is the
coefficient of moment, Cm of the blades on the centre of
rotation. The simulation was done for a few revolutions
and iteration is done at every degree of azimuth angle.
The solution is converged at every time step and for every
revolution. Fig. 9 shows the coefficient of moment, Cm
comparison between the bare VAWT and the VAWT
with the ODGV for azimuth angle from 0° to 359°. After
obtaining the average moment coefficient, the average
power coefficient can be calculated. Table 5 shows the
summarized results calculated from the simulation data
obtained for the cases of the VAWT with and without the
presence of the ODGV respectively.