This research is focusing on large-eddy simulation (LES) of turbulent transport in the atmospheric boundary layer. LES consists of numerically solving the unsteady three-dimensional equations that govern the turbulent transport of momentum and scalar quantities such as temperature, water vapor, and pollutants. In the last decade, LES has become an essential tool to study turbulent flows. Applied to the atmospheric boundary layer, LES is used to disentangle the role that different variables such as surface heterogeneity and atmospheric stability play on the removal and mixing of heat, water vapor, and pollutants.
Current limitations in computational resources impose a grid size (resolution) in LES that is much larger than the smallest scale of motion in the turbulent flow. A key issue in LES is the performance of the subgrid-scale model that accounts for the effect of the small scales (smaller than the grid size) on the evolution of the resolved turbulent fields. This research focuses on developing new subgrid-scale models to better represent the physics of the sub-grid scales and their effect on the LES results. This is done through the combination of field experiments and extensive numerical simulations. A critical factor to make fundamental progress in LES modeling is the access to more powerful computers that allow an increase in the resoultion and/or speed of the simulations. The resources at the Supercomputing Institute help provide the computer power for high-resolution simulations needed to carry out cutting-edge research in the area of large-eddy simulation of turbulent flows.
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URL: http://www.msi.umn.edu/about/publications/annualreport/ar2000/depts/IT/St_Anthony_Falls/porte-agel.html |
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