Final rept. 10 May-10 Oct 1991
UNISTRY ASSOCIATES INC HAVERTOWN PA
Pagination or Media Count:
An investigation of the embodied physics in turbulence closure models was made that focused on compressible turbulent flows, boundary layer and free shear layers, including wall effects such as roughness, blowing, curvature. A hybrid k-3 turbulence model was selected that consists of the standard two-equation model for the outer layer and a one-equation model for the inner viscous layer. This model was chosen due to its success in analyzing compressible flows including interactions, as well as the experience base using k-e models to treat a wide range of engineering problems, while also being adaptable to industrial codes. The baseline model will consider the Sarkar and Zeman compressible-dilatation terms together with the hybrid k-e turbulence model. A phase II building-block approach is recommended that provides a dial-a-model menu from a matrix of turbulence closure coefficients generated from the baseline compressible hybrid k-e model and a multi-zone Navier-Stokes solver. A direct result of this effort will be the technology transfer to the governmentindustrial sector and the commercialization of a Turbulence-Tutorial. The tutorial will consist of a boundary layer code, turbulence models, and a database adaptable to a PC to provide researchersteachersstudents with guidance to explore turbulence issues.
- Fluid Mechanics