A multimesh adaptive scheme for air quality modeling with the finite element method
Cita com:
hdl:2117/26313
Tipus de documentArticle
Data publicació2014
Condicions d'accésAccés obert
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Abstract
A multimesh adaptive scheme for convection–diffusion–reaction problems for a large number of components
is presented. The problem is solved by splitting transport and reaction processes. This way, the evaluation
of the nonreactive part for each component and the reaction at each node constitute independent tasks. This
allows to discretize each component of the solution on a distinct computational mesh, adapted on the basis
of its error indicator. The standard single-mesh strategy is used for comparison. Simulations of a point emis-
sion in a 3D domain are presented. Low remeshing periods of the adaptive scheme are found to be optimal,
in terms of computational cost and accuracy, for the nonreactive problem. Examples with several reaction
terms, with an increase of the complexity, are then presented. Results show that the accuracy of single-mesh
and multimesh strategies are similar. Instead, the computational cost of the multimesh strategy is lower than
the single-mesh in the majority of the examples; this process is controlled by the stiff behavior of the reactive
term. The problem size of the multimesh scheme is much lower, and therefore, larger spatial discretizations
can be simulated for a given available memory. The efficiency of the multimesh strategy increases with
the number of species and the number of species that develop a plume. Finally, an example of a punctual
emission considering realistic values of the initial concentrations and using the Community Multiscale Air
Quality-CBO5 reaction model, which involves 62 components, is presented; the small-scale structure of the
different nitrogen components near the emitter is capture
CitacióMonforte, L.; Pérez-Foguet, A. A multimesh adaptive scheme for air quality modeling with the finite element method. "International journal for numerical methods in fluids", 2014, vol. 74, p. 387-405.
ISSN0271-2091
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