What is it about?

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.

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Why is it important?

Simulations of a point emission in a 3D domain are presented. Examples with several reaction terms, with an increase of the complexity, are included. 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. The efficiency of the multimesh strategy increases with the number of species and the number of species that develop a plume.

Perspectives

This paper show 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. The technology proposed is able to capture the small-scale structure of the different nitrogen components within the plume near the emitter.

Dr Agustí Pérez-Foguet
Universitat Politecnica de Catalunya

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This page is a summary of: A multimesh adaptive scheme for air quality modeling with the finite element method, International Journal for Numerical Methods in Fluids, October 2013, Wiley,
DOI: 10.1002/fld.3855.
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