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April 2008 edition

Validation of k-kL-&omega model for low-Reynolds number airfoil

By D. Rival, K. Aschmoneit and C. Tropea of the Institute of Fluid Mechanics and Aerodynamics, Darmstadt University of Technology, 64287 Darmstadt, Germany.

This article has been edited from a paper presented to the International Aerospace CFD Conference in Paris.

Simulations using the k-kL-&omega turbulence model for an SD7003 low-Reynolds-number airfoil have been performed and compared with a variety of experimental data available in the open literature. This three-equation RANS model is currently offered as a beta-test model in FLUENT 6.3, providing a means of capturing boundary-layer transition using a single-point approach, that is without the need for an external linear-stability solver to predict transition. The k-&omega SST (low-Reynolds number correction) turbulence model has also been tested for its accuracy at these low-Reynolds numbers. All test cases were performed at Re=60k, where a long and stable laminar separation bubble is known to exist over a large range of angles of attack. Simulations for three free-stream turbulence intensities (Tu=0.1%, 0.5% and 1.0%) were examined, representing 'mixed' transition, a state where both natural and bypass transition play a role. It is found that the separation and transition points are well-predicted, but that further development of turbulence downstream is too slow. Consequently, the reattachment point is predicted to be further downstream in comparison with the PIV measurements made in both wind and water....

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