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Dear FDS developers, The horizontal velocity profile of an MO wind profile blowing towards a tree gives the following results: The general behaviour is, I believe, correct. However, in the vicinity of the treetop, we observe an unphysical pattern. This is not due to Smokeview, as the Based on older discussions, it seems that this may be due to discretization errors. However, I find the magnitude difference of these patterns at the treetop unusually high. Is there any way to reduce this? The Lagrangian particles that model the tree are given a constant drag coefficient of 2.8. The finest meshes that contain the tree are |
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This is simply numerical (dispersion error) from the central differencing scheme in the U-component momentum equation. This is inevitable with low-order central schemes at practical grid resolutions. Look at either the velocity magnitude or kinetic energy, these should look better. |
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This is simply numerical (dispersion error) from the central differencing scheme in the U-component momentum equation. This is inevitable with low-order central schemes at practical grid resolutions. Look at either the velocity magnitude or kinetic energy, these should look better.