wind energy resource evaluation in a site of central italy ... - WindSim
wind energy resource evaluation in a site of central italy ... - WindSim
wind energy resource evaluation in a site of central italy ... - WindSim
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characterized by high <strong>w<strong>in</strong>d</strong> speed (5,93 and 6,01 m/s), while the worst sectors arecharacterized by low speed (1,73 and 2,61 m/s).A physical explanation <strong>of</strong> this phenomenon could be related to the seasonal thermaleffects. It is wise to th<strong>in</strong>k that modification <strong>of</strong> the neutral boundary layer by thermaleffects is high when the <strong>w<strong>in</strong>d</strong> speed is low and vice versa. Accord<strong>in</strong>g to this, sectorscharacterized by high <strong>w<strong>in</strong>d</strong> speed should be considered almost free <strong>of</strong> thermaleffects. Then, consider<strong>in</strong>g that the simulations do not take <strong>in</strong>to account the<strong>in</strong>fluence <strong>of</strong> thermal effects, the CFD results should have a better agreement withmeasurements <strong>in</strong> sectors where <strong>w<strong>in</strong>d</strong> speed is high.A threshold value related to the importance <strong>of</strong> thermal effects on the <strong>w<strong>in</strong>d</strong> field<strong>w<strong>in</strong>d</strong> velocity is difficult to be deduced from the results, but a range <strong>in</strong> which it isexpected is 3-4 m/s. Data Analysis confirms that RMS errors are low when the <strong>w<strong>in</strong>d</strong>is blow<strong>in</strong>g with a velocity higher than a value conta<strong>in</strong>ed <strong>in</strong> the range, result<strong>in</strong>g <strong>in</strong> afair agreement between experimental data and result <strong>of</strong> the CFD model.96