LENG, X; CHANSON, Hubert; LUBIN, Pierre

doi:10.15142/T3FS9Q

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LENG, X

CHANSON, Hubert

LUBIN, Pierre

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Communication dans un congrès avec actes

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7th International Symposium on Hydraulic Structures, 7th International Symposium on Hydraulic Structures, 2018-05-15, Aachen.

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A positive surge or bore is an unsteady rapidly-varied open channel flow characterised by a rise in water surface elevation. After formation, the bore is traditionally analysed as a hydraulic jump in translation and its leading edge is characterised by a breaking roller for Fr1 > 1.3-1.5. The roller is a key flow feature characterised by intense turbulence and air bubble entrainment. Herein detailed air-water flow measurements were conducted in breaking bores propagating in a large-size channel. The data showed a relatively steep roller, with a short and dynamic bubbly flow region. The results were used to validate a Computational Fluid Dynamics (CFD) model of breaking bores. The instantaneous void fraction and bubble distribution data showed systematically a lesser aeration region in the physical model, compared to the numerical data. The differences may be linked to some limitation of the CFD modelling.< Réduire

Mots clés en anglais

Breaking bores

air bubble entrainment

computational fluid dynamics

CFD modelling

physical modelling

two- phase flow

unsteady flow motion

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Air Bubble Entrainment in Breaking Bores: Physical and Numerical CFD Modelling

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