Stochastic parameterization for large eddy simulation of geophysical flows |
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Authors: | Jinqiao Duan Balasubramanya T Nadiga |
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Institution: | Department of Applied Mathematics, Illinois Institute of Technology, Chicago, Illinois 60616 ; Los Alamos National Laboratory, MS-B296, Los Alamos, New Mexico 87545 |
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Abstract: | Recently, stochastic, as opposed to deterministic, parameterizations are being investigated to model the effects of unresolved subgrid scales (SGS) in large eddy simulations (LES) of geophysical flows. We analyse such a stochastic approach in the barotropic vorticity equation to show that (i) if the stochastic parameterization approximates the actual SGS stresses, then the solution of the stochastic LES approximates the ``true" solution at appropriate scale sizes; and that (ii) when the filter scale size approaches zero, the solution of the stochastic LES approaches the true solution. |
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