PNS (Parabolized Navier-Stokes) of Large-Angle-of-Attack Viscous Hypersonic Flows
Abstract
A need has emerged for numerical schemes to predict hypersonic flows around three-dimensional configurations. The Army has shown considerable interest in applying 3-D PNS schemes to study supersonic/hypersonic flowfields around projectiles and missiles. Although the existing noniterative PNS schemes offer an attractive combination of accuracy and affordability, such schemes suffer from several numerical instability and inaccuracy problems. This study develops a new 3-D PNS scheme with significantly enhanced stability and accuracy characteristics. This three-dimensional PNS scheme is inherently stable in the subsonic as well as the supersonic flow regions and, thus, does not require any sublayer approximation. It uses a generalized PNS formulation to treat perfect- gas and equilibrium-air gas models in a unified manner. A second-order smoothing approach is used to damp the solution oscillations, while a pseudo-unsteady approach is used to dramatically improve the solution efficiency without compromising the solution accuracy. A new fully-implicit and crossflow-coupled shock-fitting approach has been developed, along with a new predictor-corrector solution scheme to treat large crossflow separated regions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1988
- Accession Number
- ADA201081
Entities
People
- Bilal A. Bhutta
- Clark H. Lewis