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

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Abstract

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.

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Abbreviations

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

p′ (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 → :

instantaneous air velocity vector

U :

air velocity outside the boundary layer

X :

fetch

α :

instantaneous incidence angle of the air velocity

η :

instantaneous water level

φ :

phase shift

ξ :

wave energy amplification ratio

ζ p :

non dimensional energy transfer ratio by pressure work

ξ M :

non dimensional energy transfer ratio predicted by Miles theory

ϱ a :

air density

ϱ w :

water density

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Authors and Affiliations

  1. Institut de Mécanique Statistique de la Turbulence, Unité Mixte Université C.N.R.S. n∘ 380033; 12, Avenue du Général Leclerc, F-13003, Marseille, France

    J.-P. Giovanangeli

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Giovanangeli, JP. A new method for measuring static pressure fluctuations with application to wind-wave interaction. Experiments in Fluids 6, 156–164 (1988). https://doi.org/10.1007/BF00230727

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