Fluid Transmission Line Dynamics for Signals of Finite Amplitude

Abstract

The transient response of a straight, cylindrical, fluid transmission line to a finite-amplitude pressure input is studied numerically to identify deviations from linear behavior. A nonlinear, finite-difference method is developed to predict the changes in the shape of a pressure wave as it propagates. The finite-difference algorithm is also applied to a linearized version of the governing equations to generate a basis against which to identify nonlinear behavior. The finite-difference method accounts for viscous losses and heat transfer. An algebraic model for calculating eddy-viscosity in transient, turbulent flows is included. Numerical simulations of a semi-infinite transmission line are performed using trapezoidal and half-sinusoidal pulses as well as a terminated-ramp as input pressure signal waveforms. Significant differences between linear and nonlinear results are found, even for input signals with maximum pressures less than two percent of the initial, undisturbed pressure. Theses. (RRH)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1989
Accession Number
ADA215758

Entities

People

  • Wayne P. Chepren

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Differential Equations
  • Fluid Dynamics
  • Fluid Flow
  • Heat Transfer
  • Mechanical Engineering
  • Mechanical Properties
  • Mechanics
  • Partial Differential Equations
  • Steady Flow
  • Three Dimensional
  • Turbulent Flow
  • Two Dimensional
  • Viscous Flow
  • Waveforms

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Computational Modeling and Simulation
  • Fluid Dynamics.