Numerical Simulation of Supersonic Turbulent Boundary Layer Flow Under the Influence of Mild Pressure Gradients
Abstract
Mach 2.9 boundary layer flow (R sub e/m approx. 1.75x10 to the 7th power) under the influence of mild pressure gradients is studied numerically. Baldwin-Lomax and k - omega turbulence models are incorporated into a cell centered finite volume flow solver and the results are compared with hot wire anemometry and Laser Doppler Velocimetry (LDV) measurements obtained for the same geometries in the AFIT Mach 2.9 wind tunnel. Agreement between the present simulations obtained with the k - omega turbulence model and experimental velocity profiles is excellent in all test sections. Nondimensional turbulent shear stress predictions closely match experimental data in the flat plate and adverse pressure gradient sections while slightly over predicting this quantity in the favorable pressure gradient region. Favorable pressure gradients are found to stabilize the flow field, resulting in increased boundary layer thickness and reduced turbulent and wall shear stress distributions. Additionally, the presence of a favorable pressure gradient is found to diminish the effects of variations in upstream boundary condition specification. Adverse pressure gradients are found to destabilize the flow field, resulting in increases in the turbulent shear stress, turbulent kinetic energy, and wall shear stress. Upstream effects are found to play a major role in adverse pressure gradient flowfield development. Flow field features are predicted more accurately with the k - omega model than with the Baldwin-Lomax model.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1995
- Accession Number
- ADA325879
Entities
People
- Eric T. Fick
Organizations
- Air Force Institute of Technology