In this study, aerodynamic analyses have been conducted for Giromill type Vertical-Axis Wind Turbine (VAWT) configuration. Reynolds-averaged Navier-Stokes equations with Standard k-ω and SST k-ω turbulence models are solved for unsteady flow problems. Also, an experiment model of Giromill type VAWT model has been designed in this study. Aerodynamic performance test of the present VAWT model experiments is effectively conducted using the vehicle mounted testing system. The comparison result between the experiment and the computational fluid dynamics (CFD) analysis are presented in order to verify the accuracy of CFD modeling with the different turbulent model.