Finite Element Analysis of Shock-Induced Hull Cavitation

Abstract

This report describes a new version of the USA-STAGS code that can treat the problem of hull cavitation of submerged structures subjected to underwater shock. In addition, this version can also be applied to the analysis of submerged structures that include internal fluid volumes. In the present implementation, the Doubly Asymptotic Approximation (DAA) serves to simulate a radiation boundary that is located away from the fluid-structure surface at a distance sufficient to contain any cavitating region. The enclosed fluid is discretized with volume finite elements that are based upon a displacement potential formulation due to R. E. Newton. An explicit time integration method is used to advance the solution in the fluid-volume region. An implicit time integration method is still used for the structure and DAA boundary, while the staggered solution procedure has been modified to treat the interface conditions that arise from the presence of the fluid-volume elements. Results for two example problems obtained with the new software show excellent agreement with those obtained by other methods.

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Document Details

Document Type
Technical Report
Publication Date
Feb 26, 1982
Accession Number
ADA131271

Entities

People

  • C. A. Felippa
  • J. A. Deruntz

Organizations

  • Lockheed Martin Missiles and Space

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Waves
  • Boundaries
  • Cavitation
  • Classification
  • Computational Science
  • Computer Programs
  • Computer Simulations
  • Computers
  • Constitutive Equations
  • Difference Equations
  • Differential Equations
  • Engineering
  • Finite Element Analysis
  • Hydrostatic Pressure
  • Physical Properties
  • Radial Velocity
  • Two Dimensional

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Dynamics.
  • Underwater engineering and Marine Technology.