Title page for ETD etd-01252008-163458


Type of Document Dissertation
Author Ravi, R.
URN etd-01252008-163458
Title High angle of Attack Forebody Flow Physics and Design Emphasizing Directional Stability
Degree PhD
Department Aerospace and Ocean Engineering
Advisory Committee
Advisor Name Title
Mason, William H. Committee Chair
Grossman, Bernard M. Committee Member
Schetz, Joseph A. Committee Member
Simpson, Roger L. Committee Member
Walters, Robert W. Committee Member
Keywords
  • Computational Fluid Dynamics (CFD)
  • aerodynamics
Date of Defense 1997-12-01
Availability unrestricted
Abstract
A framework for understanding the fundamental physics of flowfields over forebody type shapes at low speed, high angle of attack conditions with special emphasis on sideslip has been established. Computational Fluid Dynamics (CFD) has been used to study flowfields over experimentally investigated forebodies: the Lament tangent-ogive forebody, the F-5A forebody and the Erickson chine forebody. A modified version of a current advanced code, CFL3D, was used to solve the Euler and thin-layer Navier-Stokes equations. The Navier-Stokes equations used a form of the Baldwin-Lomax turbulence model modified to account for massive crossflow separation. Using the insight provided by the solutions obtained using CFD, together with comparison with limited available data, the aerodynamics of forebodies with positive directional stability has been revealed. An unconventional way of presenting the results is used to illustrate how a positive contribution to directional stability arises. Based on this new understanding, a parametric study was then conducted to determine which shapes promote a positive contribution to directional stability.
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