Abstract
Finite volume fitted difference schemes are constructed for one and two-dimensional air-pollution models with degenerate vertical diffusion. A weak formulation of the equations imposes the boundary conditions naturally along the boundaries, where the equation becomes degenerate. Then, we establish the energy well-posedness of the initial-boundary value problems. We prove minimum principle and show that the solution cannot attains its minimum on the boundary of degeneration and this allows us to control the positivity of its solution. To overcome the degeneracy of the vertical diffusion, we perform a local fitted space discretization. Non-negativity of numerical solutions is proved. Numerical experiments are discussed. As examples, we apply the method to study the pollution concentration to Monin–Obukhov types atmospheric models.
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This research is supported by the Bulgarian National Science Fund under Bilateral Project KP/Russia 06/12-2020 and partly by FNSE-03.
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Communicated by Vinicius Albani.
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Koleva, M.N., Vulkov, L.G. Positivity-preserving finite volume difference schemes for atmospheric dispersion models with degenerate vertical diffusion. Comp. Appl. Math. 41, 406 (2022). https://doi.org/10.1007/s40314-022-02083-y
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DOI: https://doi.org/10.1007/s40314-022-02083-y