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Journal ArticleDOI

A multimesh adaptive scheme for air quality modeling with the finite element method

28 Feb 2014-International Journal for Numerical Methods in Fluids (John Wiley & Sons, Ltd)-Vol. 74, Iss: 6, pp 387-405
TL;DR: In this paper, a multimesh adaptive scheme for convection-diffusion-reaction problems for a large number of components is presented, where the evaluation of the nonreactive part for each component and the reaction at each node constitute independent tasks.
Abstract: SUMMARY 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 emission 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 captured. Copyright © 2013 John Wiley & Sons, Ltd.

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Citations
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Journal ArticleDOI
TL;DR: In this paper, the authors presented a numerical model to study pollutant dispersion in the atmospheric boundary layer (ABL) by accounting for the mechanisms of advection by the mean wind in the horizontal direction, turbulent diffusion in the vertical direction to ground surface, dry deposition, and radioactive decay.

20 citations

Proceedings ArticleDOI
05 Jan 2015
TL;DR: Multi-Mesh CFD is implemented for a finite volume method code and used to solve the quasi-1D nozzle problem and may have lower discretization errors compared to both the unadapted meshes and a more traditional adaptation process with only one mesh.
Abstract: Multi-Mesh CFD is implemented for a finite volume method code and used to solve the quasi-1D nozzle problem. This method solves each governing equation on a different mesh that has been adapted specifically for that equation. These meshes are adapted through r-adaptation (i.e. node movement) using truncation error (TE) as the criterion for refinement. The adaptation is performed either through TE equidistribution or mesh optimization. Because each governing equation operates on a mesh adapted to reduce its own TE, the resulting solution may have lower discretization errors compared to both the unadapted meshes and a more traditional adaptation process with only one mesh.

13 citations

Journal ArticleDOI
TL;DR: In this article, the source identification problem in air pollution modeling is described by an advection-diffusion equation with physically realistic coefficients, which is solved by the combination of adaptive meshes and a stabilized finite element method.

9 citations

References
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01 Jan 1999

966 citations


"A multimesh adaptive scheme for air..." refers methods in this paper

  • ...In the second, a chemical module belonging to CMAQ is employed [22], CB05Cl, which involves 62 species and 177 reactions and incorporates aqueous-phase chemical mechanisms and active chlorine [19, 36]....

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Journal ArticleDOI
TL;DR: The reader of this book gets a detailed, logically organized discussion of air pollution chemistry and physics, in which few concessions have been made to the real difficulties of the subject matter and none to clarity of presentation as mentioned in this paper.
Abstract: This is a n ambitious book on a complex subject, written by an expert in the field. It is aimed at graduate students and above, perhaps including upper-level undergraduates, and subjects treated are accordingly many, diverse, and intricately interwoven. It could easily have failed on any one of a number of counts, and it is a distinct pleasure to report that, as far as this reviewer is concerned, it did not. The reader of this book gets a detailed, logically organized discussion of air pollution chemistry and physics, in which few concessions have been made to the real difficulties of the subject matter and none to clarity of presentation. The text material is divided into six parts: pollutants — sources and effects; air pollution chemistry; aerosols; air pollution-meteorology; atmospheric diffusion; and a special topics section in which the important subjects of air pollution statistics and acid rain are discussed.

458 citations


"A multimesh adaptive scheme for air..." refers background in this paper

  • ...The same meteorological data than in the references is used [6, 15]: the convective velocity is parallel to the x-axis, the diffusion is constant in the horizontal plane , and Dxx DDyy D 50 m(2)/s....

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  • ...Simple but realistic meteorologic conditions are imposed (wind and diffusion), which are fixed following the characterization of the boundary layer presented in [15]....

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01 Jan 2000

423 citations


"A multimesh adaptive scheme for air..." refers background in this paper

  • ...The RIVAD/ARM3 scheme [34] is a simplified model that predicts the sulfate and nitrate production rates assuming a steady state concentration of the hydroxil radical....

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Book
01 Jan 1974
TL;DR: In this paper, basic theory of Viscous flow, Stokesian fluids, hydrodynamics, aerodynamics, gasdynamics and compressible flow, wave and stability phenomena are discussed.
Abstract: : ;Contents: Basic theory; Viscous flow, Stokesian fluids, hydrodynamics; Aerodynamics, gasdynamics and compressible flow; Wave and stability phenomena; Diffusion, dispersion and convection; Lubrication; Estuary and thermal/fluid flow; Viscous, creeping flow; Flow in porous media; Programming aspects and applications.

413 citations


"A multimesh adaptive scheme for air..." refers methods in this paper

  • ...A Crank–Nicolson scheme with a least-square formulation of the weak form is used [18, 24])....

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