Examination of the shear stress transport assumption with a low-Reynolds number κ - ω model
Paper in proceedings, 2007

Using a low-Reynolds number k - ω model and its high-Reynolds number variant as base models, the Shear Stress Transport (SST) concept is examined in computations of flows around the RAE2822 airfoil and the DLR-F6 wind-body configuration. Both flows are characterized by local boundary layer separation. Based on an analysis of the net production for the turbulent kinetic energy, k, and for its specific dissipation rate, u, the rationale is highlighted behind the SST formulation that enables improved predictions of flow separation. It is shown that the SST formulation may make the modeling contain the growth of the production of k and, consequently, suppress the turbulent diffusion. Incorporating the SST assumption, the model responds more appropriately to the effect of an adverse pressure gradient in the boundary layer and produces more extended flow separation bubble than the original base model. Improvement due to the SST formulation is also observed in predictions of the shock location for the transonic aerodynamic flows considered in this work.

Author

Peng Shia-Hui

Chalmers, Applied Mechanics, Fluid Dynamics

P. Eliasson

Swedish Defence Research Agency (FOI)

FOI

Lars Davidson

Chalmers, Applied Mechanics, Fluid Dynamics

37th AIAA Fluid Dynamics Conference; Miami, FL; United States; 25 June 2007 through 28 June 2007

Vol. 1 178-191

Subject Categories

Fluid Mechanics and Acoustics

ISBN

1563478978

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Latest update

2/27/2018