Wind power assessment in complex terrain is more demanding task than site assessment in flat terrain. Modeling wind conditions with standard linear models such as WAsP (Wind Atlas Analysis and Application Progam) does not sufficiently reproduce wind conditions in complex terrain, ecpecially on leeward sides of terrain slopes. Even anemometer measurements directly at a wind turbine’s site do not necessarily deliver the results necessary for prediction calculations, as extrapolations of wind speed to hub height is tricky.
A more complex model, based on Reynolds averaged Navier-Stokes equations and modified two-equations k- turbulence model for neutral atmospheric boundary layer conditios, written in general curvelinear nonorthogonal coordinate system, has been used. The sets of full conservation equations are numericaly solved by Computational Fluid Dynamics (CFD) technique.
A comparison of the application of linear model WAsP and CFD model WindSim on complex terrain is presented. Siting of mezzo and micro models of Seličevica (southeasterly Serbia, nearby the City of Niš) has been investigated. Considerable discrepancies of wind speed have been obtained using linear and CFD models. Statistics of annual electricity production varies up to 30% for Seličevica site.
This paper is concerned by the National Program of Energy Efficiency, project number: TR33036, funded by the Government of Republic of Serbia.
Mehanika i konstrukcije