On the Turbulence-Modeling Requirements of Three-Dimensional Boundary-Layer Flows
Appropriate three-dimensional equations have been solved, in finite-difference form, and with boundary conditions corresponding to the infinite swept wing of van den Berg and Elsenaar and the full three-dimensional data of East and Hoxey. In the former case, results were obtained with an algebraic eddy-viscosity formulation and a two-equation model which allows for transport of turbulence kinetic energy and dissipation rate. The results show that both models yield similar mean-flow characteristics, provided the same wall boundary conditions are employed, and that these deviate from the measurements with increasing adverse pressure gradient. As with previous investigations of two-dimensional flows, the procedure used to generate the initial turbulence energy profile can significantly influence the calculated results. The calculations of the fully three-dimensional flow made use of the algebraic eddy-viscosity formulation and, in keeping with the previous results for two-dimensional flows and the swept wing, the agreement with measurements is excellent until the separation region is approached.
KeywordsTurbulence Model Turbulent Boundary Layer Adverse Pressure Gradient Separation Line Wall Boundary Condition
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