Accession Number : ADA258051


Title :   A Coupled Finite Element-Boundary Element Method for Calculations of the Interaction between an Explosion Bubble and a Submerged Compliant Target


Descriptive Note : Research and development rept.


Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD


Personal Author(s) : Milligan, Charles D ; Zilliacus, Stephen


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258051.pdf


Report Date : Sep 1992


Pagination or Media Count : 52


Abstract : An axisymmetric boundary element flow algorithm is coupled with a finite element structural analyzer to perform interactive calculations of the growth and subsequent collapse of an explosion bubble near a submerged compliant structure. The validity of the program is established through direct comparisons with published experimental data. A parametric study of the interaction between a growing and collapsing bubble and a spherical shell is presented. The results show that if the stiffness of the shell is sufficiently low, then the mass of the shell is a critical parameter in the collapse problem. If the mass of the structure is high, a reentrant jet forms and is then directed towards the shell. As the mass of the spherical shell is decreased, the collapse becomes spherical with no jet formation. At the lowest structural mass for which calculations are performed, a jet directed away from the structure begins to form. The ratio of the depth of submergence to bubble maximum radius was also found to be a critical parameter in the collapse problem. When this ratio is large (greater than 100), the collapse is driven by interaction forces. However, for shallow submergence, buoyancy effects become more important than interaction forces. Fluid-Structure Interaction, Boundary Element, Fluid Loading, Bubble Collapse, Numerical Prediction Method, Whipping, Finite Element, Cavitation.


Descriptors :   *COMPUTER PROGRAMS , *ALGORITHMS , *FINITE ELEMENT ANALYSIS , *EXPLOSION BUBBLES , *FLOW , RATIOS , EXPERIMENTAL DATA , COMPARISON , EXPLOSIONS , BOUNDARIES , AXISYMMETRIC , CAVITATION , BUOYANCY , COLLAPSE , ANALYZERS , FLUIDS , BUBBLES , DEPTH , STIFFNESS , PREDICTIONS , INTERACTIONS , PARAMETERS , MASS


Subject Categories : Numerical Mathematics
      Computer Programming and Software
      Explosions


Distribution Statement : APPROVED FOR PUBLIC RELEASE