The two-layer approach of turbulence modeling is based on an idea that even a complex (more anisotropic) flow would become a simple (less anisotropic) type as moving to the near-wall region. Calculation of the complex turbulent flow, which is represented by a recirculating swirling flow in pipe-expansion configuration, is performed using a two-layer turbulence model constructed by a Reynolds stress model (RSM) and a low-Reynolds-number (LRN) k - ε model. As anticipated, better predictions in the fully turbulent zone can be achieved using the hybrid (two-layer) RSM/LRN model, in comparison with what are obtained using the pure LRN k - ε model in the calculations. Furthermore, it is found that the near-wall predictions, for which the associated LRN k - ε model is responsible, can be appreciably improved using the hybrid RSM/LRN k - ε model in the calculations of complex flows.
|Number of pages||15|
|Journal||International Journal of Turbo and Jet Engines|
|Publication status||Published - 2000 Dec 1|
All Science Journal Classification (ASJC) codes
- Aerospace Engineering