Relaxation Factor Effects in the Non-Linear Mixed Spectral Finite Difference Model of Flow Over Topographic Features |
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Authors: | Xiao Yu Wensong Weng Peter A Taylor Dong Liang |
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Institution: | (1) Windlab Systems, Epicorp Centre, 401 Clunies Ross Street, Canberra, ACT, 2601, Australia;(2) CSIRO Land and Water, Black Mountain Laboratories, Canberra, ACT, 2601, Australia |
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Abstract: | The nonlinear version of the mixed spectral finite difference model of atmospheric boundary-layer flow over topography is
reviewed. The relations between the stability of the iteration scheme and its relaxation parameter are discussed. Suitable
choice of the relaxation factor improves the computational stability on terrain with maximum slope up to 0.5 or 0.6 in certain
circumstances. Examples of relatively high slope terrain are used to test the stability. A two-dimensional version of the
model is considered. More detailed simulations are studied and analyzed for a comparison with wind-tunnel flow over periodic
sinusoidal surfaces. An application on real topography is given for Bolund hill in Roskilde, Denmark. |
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