Turbulence modelling of confined swirling flows

摘要

Five test cases including a parallel and four confined swirling flows are calculated by means of the computer code FLOW3D from Harwell Laboratory. The k-(epsilon) model (KEM) and Reynolds stress model RSM are used to calculate isothermal flows, but to calculate non-isothermal flows RMS with only molecular diffusion, KEM and Reynolds flux model (RFM) are used. The wall reflection term (WRT) in RSM is implemented in all cases. This term can be difficult to implement in flows with complex geometries. Body-fitted grid is used in cases, which have complex geometries. However, to compare with body-fitted grid, rectangular grid is also applied. All turbulence models together with their boundary conditions are described in detail. A detail of WRT for north (south), down (up) and divergent wall is also described. Results used to compare with experimental data are shown as velocity profiles. For complex flows, figures with streamlines, velocity vectors and turbulent kinetics energy figures are also presented.(au) (5 tabs., 114 ills., 41 refs.).