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Revista Brasileira de Meteorologia

versão impressa ISSN 0102-7786versão On-line ISSN 1982-4351

Resumo

ROBALLO, Suelen Trindade; FISCH, Gilberto  e  GIRARDI, Roberto da Motta. Atmospheric flow at the Alcantara Lauching Center (ALC): part II - experiments at a wind tunnel. Rev. bras. meteorol. [online]. 2009, vol.24, n.1, pp.87-99. ISSN 1982-4351.  https://doi.org/10.1590/S0102-77862009000100009.

The atmospheric flow at the Alcantara Launching Center (ALC), which is localized near a 50 m cliff, was studied through analysis of wind tunnel (WT) experiments, using a 1:1000 geometric scale and floor level configurations to represent the cliff and its downwind roughness. The WT experiments, with 90° and 70° steps representing the cliff, both with and without additional downwind roughness, did show: (i) a perfect simulation of the ocean wind profile (α = 0.15) above the position of the step representing the cliff, through the use of a upwind carpeted fetch to provide the necessary roughness; (ii) the highest Reynolds number possible, based on the height of the cliff, was 6.52 x 104 inside this WT, while it reached 3 x107 at the ACL - thus, a more powerful tunnel is needed to simulate this last situation; (iii) the values of α nearest to the ones obtained at the ACL resulted from the 90° step experiment without any extra covering over the floor, except the upwind carpet; (iv) the fixing of cubes downwind of the step resulted roughness much greater than the ones observed over the ACL vegetation, so possibly simulating urban or industrial situations; (v) typical characteristics which occur downwind a step were simulated, such as the detachment and the posterior reattachment of the flow, plus the formation of circulation bubbles; (vi) the use of more powerful WTs would certainly permit the simulation of the atmospheric behavior of the ACL.

Palavras-chave : cliff; Reynolds number; Power Law; velocity profile.

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