An Arbitrary Lagrangian Eulerian (ALE) mesh treatment option recently implemented in the LS-DYNA3D finite element program is used to study underwater explosion bubble phenomena. Several experimental and analytic benchmarks are considered. First, the growth and collapse of a spherical cavity in an infinite fluid medium is computed and the result is compared with theory and a boundary element bubble dynamics model. Next, cavity growth and collapse near a planar rigid wall is considered and again ALE and boundary element results are compared. The later stages of cavity collapse are characterized by the formation of a wall-directed high-speed re-entrant fluid jet. Finally, the detonation of a small submerged explosive charge inside a pressure tank is simulated. The resulting pressure at points in the fluid are compared with experimental results. The effect of impingement of the tank-reflected shock wave on the bubble is examined. Under certain conditions, the reflected wave causes a premature bubble collapse and the corresponding bubble pressure pulse is lower than expected. The pressure pulse for the subsequent collapse seems relatively unaffected.


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    Title :

    A numerical study of underwater explosion bubble phenomena


    Additional title:

    Numerische Untersuchung des Phänomens der Unterwasser-Explosionsblasen


    Contributors:


    Publication date :

    1995


    Size :

    6 Seiten, 9 Bilder, 2 Tabellen, 15 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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