Predictions of flow through an isothermal serpentine passage with linear eddy-viscosity Reynolds Averaged Navier Stokes models.

Laskowski, Gregory Michael

Sandia National Laboratories

关键词: Forecasting;    Computerized Simulation;    Fluid Flow;    Isotropy;    Turbulence;   

DOI  :  10.2172/875612
RP-ID  :  SAND2005-7427
RP-ID  :  AC04-94AL85000
RP-ID  :  875612

美国|英语

来源: UNT Digital Library

【 摘 要 】

Flows with strong curvature present a challenge for turbulence models, specifically eddy viscosity type models which assume isotropy and a linear and instantaneous equilibrium relation between stress and strain. Results obtained from three different codes and two different linear eddy viscosity turbulence models are compared to a DNS simulation in order to gain some perspective on the turbulence modeling capability of SIERRA/Fuego. The Fuego v2f results are superior to the more common two-layer k-e model results obtained with both a commercial and research code in terms of the concave near wall behavior predictions. However, near the convex wall, including the separated region, little improvement is gained using the v2f model and in general the turbulent kinetic energy prediction is fair at best.