Accession Number:

ADA230440

Title:

Computational Investigation of Circulation Control Turbulence Modeling

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s):

• Scruggs, T. B.

Report Date:

1990-12-01

Pagination or Media Count:

133.0

Abstract:

A computational study of the turbulence model parameters and the effect on the flow field of a circulation control airfoil was conducted. A Beam- Warming algorithm with a modified Baldwin-Lomax turbulence model was used to solve the Navier-Stokes equations. A comparison between the effects of the Bradshaw constant on the flow field about the cylinder and the flow field about an airfoil were to be made. The lack of a steady converged solution for the cylinder precluded the analysis of the flow field about a cylinder. For the airfoil, the separation point moves rearward and an enhanced vortex pattern is developed as the Bradshaw constant is increased. Once a high enough value is reached, the curvature correction has minimal effect. The results obtained indicate that a better turbulence model must be employed before CFD can be used to accurately predict the flow around a circulation control airfoil.

Descriptors:

• *CONTROL
• MODELS
• PARAMETERS
• TURBULENCE
• CORRECTIONS
• CURVATURE
• FLOW FIELDS
• SEPARATION
• NAVIER STOKES EQUATIONS
• CIRCULATION
• COMPUTATIONS
• AIRFOILS

Subject Categories:

• Aerodynamics
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE