A Structure-Fluid Interaction Capability for the NASA Structural Analysis (NASTRAN) Computer Program

Abstract

The report describes a method for incorporating the structure-fluid interaction effect into NASTRAN dynamic frequency response calculations for submerged structures. The interaction equation is derived by incorporating the effect of dynamic surface mobility into the equations which approximate the surface Helmholtz integral equation and by requiring velocity compatibility at the fluid-surface interface. The method is implemented through an interface between the computer program, XWAVE, for acoustic pressure calculations and NASTRAN. The method is demonstrated by calculating the shell-surface-fluid interaction pressures on a hollow sphere submerged in an infinite fluid and excited by a radial point harmonic forcing function. The surface pressure results are compared with values calculated using an analytic formula of M.C. Junger.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1972
Accession Number
AD0752484

Entities

People

  • David W Taylor
  • Francis M. Henderson

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Acoustics
  • Computations
  • Computer Programs
  • Computers
  • Equations
  • Frequency
  • Frequency Response
  • Geometry
  • Grids
  • Integral Equations
  • Materials
  • Mathematics
  • Mechanics
  • Pressure Distribution
  • Sound Pressure
  • Structural Analysis
  • Vibration

Fields of Study

  • Physics

Readers

  • Aerospace Propulsion Engineering.
  • Explosive Engineering.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)