Abstract
We have analyzed the influence of the actual height of Bolund island above water level on different full-scale statistics of the velocity field over the peninsula. Our analysis is focused on the database of 10-minute statistics provided by Risø-DTU for the Bolund Blind Experiment. We have considered 10-minut.e periods with near-neutral atmospheric conditions, mean wind speed values in the interval [5,20] m/s, and westerly wind directions. As expected, statistics such as speed-up, normalized increase of turbulent kinetic energy and probability of recirculating flow show a large dependence on the emerged height of the island for the locations close to the escarpment. For the published ensemble mean values of speed-up and normalized increase of turbulent kinetic energy in these locations, we propose that some ammount of uncertainty could be explained as a deterministic dependence of the flow field statistics upon the actual height of the Bolund island above the sea level.
Highlights
The Bolund Experiment, conducted by Risø-DTU on the Bolund peninsula in Denmark during a 3-month period in the winter of 2007-2008 ([1], [2]), is a well-known reference case for benchmarking numerical and physical modelling of ows over complex terrain in neutral conditions without Coriolis eects
The experiment was designed as a blind comparison of dierent numerical ow models and physical models [3]
The main conclusions from the initial analysis of the experiment were: a) a great deal of scatter exists among the dierent numerical models; b) the mean speed, S, is better predicted than turbulent kinetic energy, k; and c) the best models predicting both mean wind speed and turbulent kinetic energy are the RANS models with two closure equations [3]
Summary
The Bolund Experiment, conducted by Risø-DTU on the Bolund peninsula in Denmark during a 3-month period in the winter of 2007-2008 ([1], [2]), is a well-known reference case for benchmarking numerical and physical modelling of ows over complex terrain in neutral conditions without Coriolis eects. One of the main geometric characteristics of Bolund is the escarpment facing approximately wind directions 200◦ to 295◦(see gure 1, where northerly winds correspond to 0◦ and easterly winds correspond to 90◦) The at top of the island extends downstream about 10 times the height of the island, ending with a slope down ramp of about −40◦, where intermittent detatchment again takes place [4] Another particular aspect of this test case is that the water height above the sea bed, hS , changes with time.
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