wind energy resource evaluation in a site of central italy ... - WindSim

5.3 Microscale model – evidence of recirculationThe small variations highlighted in the mesoscale model for sector 90, placed in thewest region of the site, led to a need for a deeper study in order to understand thecauses that generate the differences in speed-up. A wise preview of thephenomenon can be done considering the specified wind direction and theorography map, shown in chapter 4 In fact, a deep valley is present in the west zoneof the site, corresponding to the path of the roads signed in the map. In this region arecirculation effect due to high steepness of the west-side of the mountain can begenerated when the wind is blowing from the east direction.A smaller model has been created and the orography map is shown in the followingpicture 5.3.Figure 5.3: Orographic 3D map of the microscale model.The microscale model covers an area of dimensions 6 X 6 km and has a gridresolution finer than the mesoscale model previously described. Boundaryconditions are superimposed by the outer model (nesting technique).The general parameters applied in the simulation, run for wind direction 90 degreesand wind speed 10 m/s, are exposed in the tables 5.3 and 5.4.77