Atmospheric transport over terrain
presentationposted on 10.12.2016 by James Shaw
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Almost all operational weather forecast models represent terrain using terrain-following meshes that become highly-distorted over steep slopes. An alternative is the cut cell method but, while cut cell meshes are less distorted compared to terrain-following meshes, arbitrarily small cut cells are created that constraint the time-step for explicit numerical methods.
This motivates a new type of mesh that avoids arbitrarily small cells and most mesh distortions. Combined with a new transport scheme that is formulated for stability and accuracy over steep slopes on arbitrarily-structured meshes, we alleviate numerical instabilities and inaccuracies associated with traditional transport schemes.
Presented at the Royal Meteorological Society South East meeting at the University of Reading, 7th December 2016.