Three-Dimensional Unsteady Euler Equations Solutions on Dynamic Grids.

Abstract

A method is presented for solving the three-dimensional unsteady Euler equations on dynamic grids based on flux vector splitting. The equations are cast in curvilinear coordinates and a finite volume discretization is used for handling arbitrary geometries. The discretized equations are solved using an explicit upwind second-order predictor corrector scheme that is stable for a CFL of 2. Characteristic variable boundary conditions are developed and used for unsteady impermeable surfaces and for the far-field boundary. Dynamic-grid results are presented for an oscillating airfoil and for a store separating from a reflection plate. For the cases considered of stores separating from a reflection plate, the unsteady aerodynamic forces on the store are significantly different from forces obtained by steady-state aerodynamics with the body inclination angle changed to account for plunge velocity.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1986
Accession Number
ADA168041

Entities

People

  • D. L. Whitfield
  • Dave M. Belk
  • J. M. Janus

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamic Forces
  • Aerodynamics
  • Air Force
  • Boundaries
  • Boundary Layer
  • Classification
  • Computational Fluid Dynamics
  • Differential Equations
  • Eigenvalues
  • Equations
  • Euler Equations
  • Far Field
  • Fluid Dynamics
  • Grids
  • Pressure Distribution
  • Steady State
  • Three Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Fluid Dynamics.