The UTC Graduate School is pleased to announce that Mickael Young will present Master’s research titled, MODELING OF LAMINAR TO TURBULENT TRANSITION USING HYBRID MULTI-SCALE SIMULATION STRATEGY on 07/21/2022 at 1:00 PM in EMCS, 401. Everyone is invited to attend.
Engineering
Chair: Reetesh Ranjan
Co-Chair:
Abstract:
Laminar to turbulent transition is a common phenomenon in practical flow applications, which exhibits features that differ from laminar and turbulent regimes. As such, computational modeling techniques to predict the onset of turbulence and the changes that happen during the transition are desired. Direct numerical simulations (DNS) can be used for this purpose, but large-eddy simulations (LES) tend to be more practical as LES has a lower computational cost compared to DNS. In LES, large-scale features of the flow are resolved by the computational grid and the small-scale effects are parameterized. In this study, the hybrid two-level large-eddy simulation strategy, referred to as hybrid TLS-LES is being assessed for its ability to capture features of transition. The hybrid TLS-LES strategy additively blends the two-level simulation (TLS) and LES models to realize a robust, efficient modeling approach. TLS is a multi-scale model, in which both large- and small-scales are computed without requiring the need for spatial filtering or eddy viscosity-based concepts as needed in a conventional LES. The present work compares the hybrid TLS-LES approach with other models for LES by simulating temporally evolving laminar-to-turbulent transition within two canonical flow configurations, which include the Taylor-Green Vortex flow and plane Poiseuille flow with unsteady Tollmein-Schlichting waves. The assessment of different models for their ability to capture features of transitional flows is performed by comparing against DNS results.