Nonreflecting boundary conditions for the complete unsteady transonic small-disturbance equation
Abstract
Nonreflecting far-field boundary conditions that are consistent with the complete transonic small-disturbance (TSD) equations are derived. They are implemented in a new code for solving the complete TSD equation and are tested for a harmonically oscillating NACA 64A010 airfoil in transonic flow and for a flat-plate airfoil with a pulse in the angle of attack. Using the new boundary conditions on a relatively small grid, solutions for the airfoil that are obtained that agree with large-grid calculations, resulting in a 44 percent savings in computer time. Frequency responses for the flat plate show that most of the disturbances incident on the computational boundaries are absorbed by the boundary conditions.
- Publication:
-
AIAA Journal
- Pub Date:
- February 1985
- DOI:
- Bibcode:
- 1985AIAAJ..23..315W
- Keywords:
-
- Aerodynamic Coefficients;
- Boundary Conditions;
- Boundary Layer Flow;
- Transonic Flow;
- Unsteady Flow;
- Airfoils;
- Boundary Layer Equations;
- Computer Programs;
- Energy Absorption;
- Laminar Wakes;
- Fluid Mechanics and Heat Transfer