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Propagation d'une onde de choc dans un liquide aéré : modélisation et application aux rideaux de bulles

Abstract : The present work deals with the modelling of shock wave propagation in bubbly liquids, inorder to assess the damping of underwater explosion by bubble curtains. The modelling is basedon a scale transition technique, which allows to formulate efficient continuum models of bubblyliquids. A modelling of homogeneous bubbly liquids has first been proposed, then extended tothe case of liquids with spherical bubble clusters. A modelling of bubble fragmentation duringshock propagation has also been developed, based on a stability analysis of the bubbles. Thisstudy enables us to establish a criterion for bubble fission and to determine the numberof fragments. The accuracy of the proposed models has been assessed through comparisonwith experimental data of the literature. The agreement between numerical and experimentalresults proves the predictive capabilities of the whole approach. The modelling has then beenapplied to the mitigation of UNDEX-induced shock wave by bubble curtain. A sensitive studyabout physical parameters of the curtain has been performed, and confirms the experimentaltendencies : the use of a bubble curtain can dissipate a significant part of the shock energy.
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Hervé Grandjean. Propagation d'une onde de choc dans un liquide aéré : modélisation et application aux rideaux de bulles. Autre. Université de Bretagne occidentale - Brest, 2012. Français. ⟨NNT : 2012BRES0035⟩. ⟨tel-00776609v2⟩

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