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Rans And Hybrid Rans/Les Computations For Three-Dimensional Wings With Ice Accretion, Mithun Varma Mankada Covilakom
Rans And Hybrid Rans/Les Computations For Three-Dimensional Wings With Ice Accretion, Mithun Varma Mankada Covilakom
Theses and Dissertations
Computational investigations were carried out to evaluate the effectiveness and usability of hybrid RANS/LES techniques for predicting the unsteady separated flow over wings with ice accretion. RANS and hybrid RANS/LES computations were performed using the viscous flow solver CHEM with the SST turbulence model. Two configurations were considered during the study: an extruded wing with a glaze-ice shape and a swept wing with a simulated glaze-ice accretion. Hybrid RANS/LES results, in general, predict a less active shear layer ``roll up' than seen in the experimental data. Qualitative improvements are seen in the hybrid RANS/LES results over corresponding RANS results. The …
A One-Dimensional Subgrid Near-Wall Treatment For Reynolds Averaged Computational Fluid Dynamics Simulations, Seth Hardin Myers
A One-Dimensional Subgrid Near-Wall Treatment For Reynolds Averaged Computational Fluid Dynamics Simulations, Seth Hardin Myers
Theses and Dissertations
Prediction of the near wall region is crucial to the accuracy of turbulent flow computational fluid dynamics (CFD) simulation. However, sufficient near-wall resolution is often prohibitive for high Reynolds number flows with complex geometries, due to high memory and processing requirements. A common approach in these cases is to use wall functions to bridge the region from the first grid node to the wall. This thesis presents an alternative method that relaxes the near wall resolution requirement by solving one dimensional transport equations for velocity and turbulence across a locally defined subgrid contained within wall adjacent grid cells. The addition …