Recently proposed anisotropic two-equation turbulence models have been applied to various fundamental flows to validate their performance in predicting practical flows. The fundamental flows that are computed in this study are boundary layer flows under adverse pressure gradient, wall jet flows and turbulent offset jet flows. For computation of parabolic flows, the well-known STAN5 code has been modified to accdomodate the anisotropic two-equation models. To compute elliptic flow, a new QUICKER scheme for non-uniform grid system has been proposed. The new QUICKER formulation has been proved to minimize numerical diffusion when compared to the hybrid and the Skew-Upwind Differencion schemes. The computation of offset jet flow has been carried out based on the QUICKER formulation.
It is found that the Yoshizawa model, the Speziale model, and the Speziale model with modified constants perform much better in predicting overall turbulent flow properties of the boundary latyer and wall jet flows than the standard k-ε model. However, in offset jet flow computations, no substantial improvement has been achieved by the use of anisotropic models, which suggest that the flow of this type is not significantly influenced by the anistropy of turbulence. We conjecture that the flow is largely influenced by the inertia and the overall pressure gradient.
Many details concerning initial and boundary conditions and the numerical schemes are also discussed in the text.
