Two-dimensional flows around a wind turbine of vertical-straight-wings are investigated by the numerical simulation. Incompressible Navier-Stokes equation is used for this simulation. A rotating coordinate system, which rotates at the same speed of the turbine, is used in order to simplify the boundary conditions on the blades of the turbine. Additionally, a boundary fitted coordinate system is employed in order to express the shape of the blades precisely. A third order upwind scheme is chosen for the approximation of the non-linear terms. Numerical simulations are also carried out by changing the number of the blades and its effect is examined in order to determine the optimum configuration of this turbine.
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