Development of Turbulence Models for Shear Flows by a Double Expansion technique.
Abstract
Turbulence models are developed by supplementing the renormalization group (RNG) approach of Yakhot and Orszag with scale expansions for the Reynolds stress and production of dissipation terms. A certain additional expansion parameter is the ratio of the turbulent to mean strain time scale. While low- order expansions appear to provide an adequate description for the Reynolds stress, no finite truncation of the expansion for the production of dissipation term in power of eta suffices -- terms of all orders must be retained. Based on these ideas, a new two-equation model and Reynolds stress transport model are developed for turbulent shear flows. The models are tested for homogeneous shear flow and flow over a backward facing step. Comparisons between the model predictions and experimental data are excellent.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1991
- Accession Number
- ADA240395
Entities
People
- C. G. Speziale
- S. A. Orszag
- S. Thangam
- T. B. Gatski
- V. Yakhot