The bimodal behavior of turbulent junction flows is associated with a low-frequency unsteadiness that can have implications for the overall performance of engineering applications. The literature suggests that the bimodal behavior may be correlated with upstream boundary-layer events. To test this hypothesis, large-eddy simulations of a generic junction flow with Rood wing geometry were performed for a Reynolds number of 7000 based on airfoil thickness and approach flow velocity. Pulsed disturbances were deliberately introduced upstream of the junction to generate deterministic boundary-layer events. The variable-interval time-averaging method was employed to evaluate the effectiveness of the forcing and track the downstream development of the boundary-layer events. Cross correlations of this quantity with the circulation of the junction flow horseshoe vortex were computed to quantify the dependence of the bimodal behavior on the upstream disturbances. Several of the observed boundary-layer events led to a loss of coherence of the horseshoe vortex. Overall, the present results provide support for the hypothesis that the bimodal behavior is related to upstream boundary-layer events.
Numerical Investigation of Turbulent Junction Flow Horseshoe Vortex Dynamics
AIAA Journal ; 59 , 4 ; 1238-1253
2021-02-09
16 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Numerical Investigation of Turbulent Junction Flows
AIAA | 2021
|The Ways of the Formation of the Horseshoe Vortex in Turbulent Boundary Layers
British Library Online Contents | 1992
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