Structure-based turbulence modeling for wall-bounded flows

✍ Scribed by Stavros C. Kassinos; Carlos A. Langer; Scot L. Haire; William C. Reynolds

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 392 KB
• Volume: 21
• Category: Article
• ISSN: 0142-727X
• DOI: 10.1016/s0142-727x(00)00050-3

✦ Synopsis

The performance of Reynolds stress transport (RST) models in non-equilibrium ¯ows is limited by the lack of information about two dynamically important eects: the role of energy-containing turbulence structure (dimensionality) and the breaking of re¯ectional symmetry due to strong mean or frame rotation. Both eects are fundamentally non-local in nature and this explains why it has been dicult to include them in one-point closures like RST models. Information about the energy-containing structure is necessary if turbulence models are to re¯ect dierences in dynamic behavior associated with structures of dierent dimensionality (nearly isotropic turbulence vs turbulence with strongly organized two-dimensional structures). Information about the breaking of re¯ectional symmetry is important whenever mean rotation is dynamically important (¯ow through axisymmetric diuser or nozzle with swirl, ¯ow through turbomachinery, etc.). Here we present a new one-point model that incorporates the needed structure information, and show a selection of results for homogeneous and inhomogeneous ¯ows.