Transient Response Analysis of Multiple Submerged Structures.

Abstract

This paper describes shock-response analyses of submerged multiple structures with two different computational methods. Both methods approximate the presence of the surrounding infinite fluid with a transmitting boundary based on the first-order Doubly Asymptotic Approximation (DAA sub 1), but differ in their treatment of multiple scattering by the structures. With the first method, the DAA boundary is placed directly on the structures' wet surfacs, which is strictly valid only for low-frequency components of multiply-scattered waves. The second, more costly, method permits a more valid analysis of multiple scattering through finite-element discretization of the local fluid region. Computational results are presented for simple two-dimensional problems involving two circular cylindrical shells with internal masses. The results produced by the two methods are often in close agreement with the greatest discrepancies occurring when high-frequency multiple scattering is important. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 31, 1985
Accession Number
ADA168113

Entities

People

  • Gene C. Ruzicka
  • Thomas L. Geers

Organizations

  • Lockheed Martin Missiles and Space

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Waves
  • Air Force
  • Applied Mechanics
  • Computational Fluid Dynamics
  • Computational Science
  • Data Transmission
  • Differential Equations
  • Engineering
  • Engineers
  • Equations
  • Finite Element Analysis
  • Frequency
  • Geometry
  • Mechanics
  • Resonant Frequency
  • Transient Response Analysis
  • Two Dimensional

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Dynamics.
  • Systems Analysis and Design