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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