Development of a non-linear mixed spectral finite difference model for turbulent boundary-layer flow over topography |
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| Authors: | Dapeng Xu Keith W Ayotte Peter A Taylor |
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| Institution: | (1) Department of Earth and Atmospheric Science, York University, 4700 Keele Street, M3J 1P3 North York, Ontario, Canada;(2) Present address: NCAR, Atmospheric Environment Service of Canada MMM, Boulder, Colorado, USA |
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| Abstract: | Further development of the non-linear mixed spectral finite difference (NLMSFD) model of turbulent boundary-layer flow over topography is documented. This includes modifications and refinements to the solution procedure, the incorporation of second-order turbulence closures to the model and the three-dimensional extension of the model. Based on these higher order closures, linear limitations, boundary-layer approximation and non-linear effects are discussed. The impact of different turbulence closures on the prediction of the NLMSFD model is also demonstrated. Furthermore, sample results for 3D idealized topography (sinusoidal) are presented. The parameterization of drag over small-scale topography is also addressed. |
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