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.
A numerical study of underwater explosion bubble phenomena
Numerische Untersuchung des Phänomens der Unterwasser-Explosionsblasen
1995
6 Seiten, 9 Bilder, 2 Tabellen, 15 Quellen
Conference paper
English
Explosion , Unterwasserbereich , numerisches Verfahren , Euler-Gleichung , Lagrange-Funktion , Finite-Elemente-Methode , Benchmark-Test , Hohlraum , Kugelform , Fluid , Dynamik , Modell , Flüssigkeitsstrahl , Hochgeschwindigkeit , Druckbehälter , Simulation , Stoßwelle , Zusammenbruch , Grenzelementmethode
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