Adaptive finite element simulation of stack pollutant emissions over complex terrains
TL;DR: In this article, a three-dimensional finite element model for the pollutant dispersion is presented, where the first stage consists on the construction of an adaptive tetrahedral mesh of a rectangular region bounded in its lower part by the terrain and in its upper part by a horizontal plane.
About: This article is published in Energy.The article was published on 2013-01-01 and is currently open access. It has received 26 citations till now. The article focuses on the topics: Finite element method & Discretization.
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01 Jan 2014
TL;DR: The método del mecano as mentioned in this paper combines varios procedimientos: una transformación desde la frontera de la mecano (espacio paramétrico sencillo) to the superficie del sólido (espace físico), un algoritmo de refinamiento local de mallas de tetraedros, and un desenredo y suavizado simultáneo of mallas.
Abstract: En este trabajo presentamos avances del método del mecano [1,2] para la generación de mallas de tetraedros y la parametrización volumétrica de sólidos. El método combina varios procedimientos: una transformación desde la frontera del mecano (espacio paramétrico sencillo) a la superficie del sólido (espacio físico), un algoritmo de refinamiento local de mallas de tetraedros, y un desenredo y suavizado simultáneo de mallas. La base del método consiste en la definición de una transformación volumétrica biyectiva entre el mecano y el sólido. Se mostrarán resultados usando elementos finitos adaptativos en varios problemas medioambientales [3]: campos de viento, contaminación atmósférica, etc. Por otra parte, se aplicará la idea del método al modelado de objetos en 2D y 3D usando T-spline, así como al análisis isogeométrico [4,5].
01 Jun 2018
TL;DR: In this article, the authors used a mass-consistent model to simulate the convection-diffusion-reaction equation and then stabilised it using a Least Squares finite element method.
Abstract: Urban air quality simulation requires models with different characteristics to those used in mesoscale or microscale. The spatial discretisation resolution is one of them. Urban geometries require smaller elements than those in other scales. Mesh for this kind of geometries are generated using the Meccano method; a mesh generator that has generated high-quality meshes of complex geometries [1]. In this work, we have added capabilities to insert buildings into the mesh maintaining the element quality. Wind field should also be suitable for urban scale. To this end, we will use a mass-consistent model [2]. This approximation has performed efficiently in microscale problems, coupling with mesoscale numerical weather prediction models. Finally, an adaptive finite element method is used to simulate the convection-diffusion-reaction equation [3, 4]. The problem can be convection dominant, so it is stabilised using a Least-Squares finite element method. The resulting matrix is symmetric and is solved using the Conjugate Gradient method preconditioned with an incomplete Cholesky factorisation. The model is applied to the city of Las Palmas de Gran Canaria.
01 Jan 2015
TL;DR: In this article, the authors presented the calibration and validation of an air quality finite element model applied to emissions from a thermal power plant located in Gran Canaria, Spain using genetic algorithms.
Abstract: This work presents the calibration and validation of an air quality finite element model applied to emissions from a thermal power plant located in Gran Canaria. The calibration is performed using genetic algorithms. To calibrate and validate the model, the authors use empirical measures of pollutants concentrations from 4 stations located nearby the power plant; an hourly record per station during 3 days is available. Measures from 3 stations will be used to calibrate, while validation will use measures from the remaining station.
Cites background or methods from "Adaptive finite element simulation ..."
...The air quality model involves the generation of an adaptive tetrahedral mesh, the computation of an ambient wind field, the inclusion of the plume rise effect in the wind field, and the simulation of transport and reaction of pollutants, as described in [1]....
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...[1] Oliver A, Montero G, Montenegro R, Rodríguez E, Escobar JM, Perez-Foguet A, (2013) Adaptive finite element simulation of stack pollutant emissions over complex terrains....
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TL;DR: In this article , a multi-frontal linear equation solver for large linear equation systems is proposed to achieve near-optimal scheduling on modern massively parallel machines by employing trace theory with Diekert graphs and Foata Normal Form.
Abstract: Leveraging Trace Theory, we investigate the efficient parallelization of direct solvers for large linear equation systems. Our focus lies on a multi-frontal algorithm, and we present a methodology for achieving near-optimal scheduling on modern massively parallel machines. By employing trace theory with Diekert Graphs and Foata Normal Form, we rigorously validate the effectiveness of our proposed solution. To establish a strong link between the mesh and elimination tree of the multi-frontal solver, we conduct extensive testing on matrices derived from the Finite Element Method (FEM). Furthermore, we assess the performance of computations on both GPU and CPU platforms, employing practical implementation strategies.
TL;DR: A new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method that avoids computational expensive geometric projections and delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated.
Abstract: This is the peer reviewed version of the following article: Ruiz Girones , E., Oliver , A., Socorro, G., Cascon, J., Escobar, J.M., Montenegro, R., Sarrate, J. Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures. "International journal for numerical methods in engineering", 2018, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/nme.5706/pdf. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Cites methods from "Adaptive finite element simulation ..."
...A finite element model designed to simulate the microscale [36, 37] is used in this example....
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References
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2,290 citations
"Adaptive finite element simulation ..." refers background in this paper
...For instance, detailed Volatile Organic Components decomposition involves hundreds of thousand reactions [63, 64] that needs special methodologies to reduce the number of the modelled reactions and...
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TL;DR: In this article, two important aerosol species, sulfate and organic particles, have large natural biogenic sources that depend in a highly complex fashion on environmental and ecological parameters and therefore are prone to influence by global change.
Abstract: Atmospheric aerosols play important roles in climate and atmospheric chemistry: They scatter sunlight, provide condensation nuclei for cloud droplets, and participate in heterogeneous chemical reactions. Two important aerosol species, sulfate and organic particles, have large natural biogenic sources that depend in a highly complex fashion on environmental and ecological parameters and therefore are prone to influence by global change. Reactions in and on sea-salt aerosol particles may have a strong influence on oxidation processes in the marine boundary layer through the production of halogen radicals, and reactions on mineral aerosols may significantly affect the cycles of nitrogen, sulfur, and atmospheric oxidants.
1,589 citations
"Adaptive finite element simulation ..." refers background in this paper
...The complete description of photochemical reaction of atmospheric species is highly complex [59, 60, 61, 62]....
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Book•
03 Feb 1984
TL;DR: In this article, an up-to-date summary of the current knowledge of the statistical characteristics of atmospheric turbulence and an introduction to the methods required to apply these statistics to practical engineering problems is presented.
Abstract: Presents, in a single volume, an up-to-date summary of the current knowledge of the statistical characteristics of atmospheric turbulence and an introduction to the methods required to apply these statistics to practical engineering problems. Covers basic physics and statistics, statistical properties emphasizing their behavior close to the ground, and applications for engineers.
1,138 citations
"Adaptive finite element simulation ..." refers background in this paper
...It takes into account the horizontal interpolation and the effect of roughness on the wind velocity [46, 47, 48, 49, 50]....
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TL;DR: OH, NO3, and O3 are shown to play a central role in the formation and fate of airborne toxic chemicals, mutagenic polycyclic aromatic hydrocarbons, and fine particles.
Abstract: Tropospheric air pollution has impacts on scales ranging from local to global. Reactive intermediates in the oxidation of mixtures of volatile organic compounds (VOCs) and oxides of nitrogen (NOx) play central roles: the hydroxyl radical (OH), during the day; the nitrate radical (NO3), at night; and ozone (O3), which contributes during the day and night. Halogen atoms can also play a role during the day. Here the implications of the complex VOC-NOx chemistry for O3 control are discussed. In addition, OH, NO3, and O3 are shown to play a central role in the formation and fate of airborne toxic chemicals, mutagenic polycyclic aromatic hydrocarbons, and fine particles.
1,065 citations
"Adaptive finite element simulation ..." refers background in this paper
...The complete description of photochemical reaction of atmospheric species is highly complex [59, 60, 61, 62]....
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Book•
02 Jun 2003
TL;DR: An introduction to monotonicity-preserving schemes and other stabilization techniques and new trends in fluid dynamics, and main issues in incompressible flow problems.
Abstract: Preface. 1. Introduction and preliminaries. Finite elements in fluid dynamics. Subjects covered. Kinematical descriptions of the flow field. The basic conservation equations. Basic ingredients of the finite element method. 2. Steady transport problems. Problem statement. Galerkin approximation. Early Petrov-Galerkin methods. Stabilization techniques. Other stabilization techniques and new trends. Applications and solved exercises. 3. Unsteady convective transport. Introduction. Problem statement. The methods of characteristics. Classical time and space discretization techniques. Stability and accuracy analysis. Taylor-Galerkin Methods. An introduction to monotonicity-preserving schemes. Least-squares-based spatial discretization. The discontinuous Galerkin method. Space-time formulations. Applications and solved exercises. 4. Compressible Flow Problems. Introduction. Nonlinear hyperbolic equations. The Euler equations. Spatial discretization techniques. Numerical treatment of shocks. Nearly incompressible flows. Fluid-structure interaction. Solved exercises. 5. Unsteady convection-diffusion problems. Introduction. Problem statement. Time discretization procedures. Spatial discretization procedures. Stabilized space-time formulations. Solved exercises. 6. Viscous incompressible flows. Introduction Basic concepts. Main issues in incompressible flow problems. Trial solutions and weighting functions. Stationary Stokes problem. Steady Navier-Stokes problem. Unsteady Navier-Stokes equations. Applications and Solved Exercices. References. Index.
1,035 citations