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Article Dans Une Revue Experiments in Fluids Année : 1988

A new method for measuring static pressure fluctuations with application to wind-wave interaction

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Résumé

A new technique for in stream static pressure fluctuations sensing is presented. The higher capability of the method with regard the classical one, particularly over laboratory wind wave, is proved. First measurements have been done in a turbulent boundary layer above the air-water interface during the wave generation stage. The results show that, for pure laboratory wind waves at short fetches, a strong coupling exists between air and water motions and that the energy transfer from wind to the waves seems mainly due to the work done by the wave induced pressure fluctuations. List of symbols C wave phase celerity - C g wave group celerity - Coh coherency function - C ps pressure coefficient for a static pressure sensing head - C pt pressure coefficient for a total pressure sensing head - g gravitational acceleration - n frequency - p instantaneous static pressure - p m measured instantaneous static pressure - p t instantaneous total pressure - p tm measured instantaneous total pressure - pprime (t) static pressure fluctuation - Q pn quadspectrum between static pressure fluctuations and water level deflections - S p static pressure fluctuations spectrum - S pt total pressure fluctuations spectrum - S n wave spectrum - u rarr instantaneous air velocity vector - U air velocity outside the boundary layer - X fetch - agr instantaneous incidence angle of the air velocity - eegr instantaneous water level - phgr phase shift - xgr wave energy amplification ratio - zeta p non dimensional energy transfer ratio by pressure work - xgr M non dimensional energy transfer ratio predicted by Miles theory - rhov a air density - rhov w water density A version of this paper was presented at the 10th Symposium on Turbulence, University of Missouri-Rolla, September 22–24, 1986

Dates et versions

hal-00105088 , version 1 (10-10-2006)

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Jean-Paul Giovanangeli. A new method for measuring static pressure fluctuations with application to wind-wave interaction. Experiments in Fluids, 1988, 6, n° 3, pp.156-164. ⟨10.1007/BF00230727⟩. ⟨hal-00105088⟩
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