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http://dx.doi.org/10.6112/kscfe.2012.17.4.024

EFFECT OF LENGTH-SCALE IN DDES FOR BACKWARD-FACING STEP FLOW  

Lee, C.Y. (Dept. of Aerospace Information Engineering, Konkuk Univ.)
Sa, J.H. (Dept. of Aerospace Information Engineering, Konkuk Univ.)
Park, S.H. (Dept. of Aerospace Information Engineering, Konkuk Univ.)
Lee, E.S. (Agency for Defense Development)
Lee, J.I. (Agency for Defense Development)
Lee, K.S. (Agency for Defense Development)
Publication Information
Journal of computational fluids engineering / v.17, no.4, 2012 , pp. 24-31 More about this Journal
Abstract
Effects of the subgrid length-scale in the Delayed-Detached Eddy Simulation(DDES) are investigated based on the Spalart-Allmaras(S-A) and the k-$\omega$ Shear Stress Transport(SST) turbulence models. Driver & Seegmiller's experimental results are used to validate numerical results. Grid convergence with grid resolution and subgrid length-scale is investigated. The simulation results show that the volume method for the subgrid length-scale is more resistant to unfavorable effects of the grid size in the periodic direction than the maximum method. Using a sufficient grid resolution and an appropriate subgrid length-scale, both S-A based DDES and SST based DDES methods can provide a good correlation with the experimental data.
Keywords
Backward-Facing Step; Turbulent Flow; Unsteady Flow; Delayed-Detached Eddy Simulation(DDES);
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