Flow and Dispersion Phenomena in a Simplified Urban Square

Bálczó, Marton; Lajos, Tamás

doi:10.3311/ppci.7852

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…6). Flow patterns typical for urban canopy (Balczó and Lajos, 2015) were also observed in our simulation.…”

Section: Resultssupporting

confidence: 76%

Dust deposition, microscale flow- and dispersion model of particulate matter, examples from the city center of Budapest

Farkas¹,

Török²

2019

Időjárás

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⎯ Despite the air quality improvement, air pollution is still a severe problem in Budapest, and the city is one of the most polluted capitals of Europe. Dust has an adverse health effect, and it also causes aesthetic changes to buildings. Dust contributes to the damage of stone and may also result material loss. The paper analyzes the composition of dust and also describe its flow patterns in the city center of Budapest. The study area is located in one of the most polluted areas of Budapest, at Margit Boulevard. Dust samples were collected from the facades of buildings. Samples were analyzed with particle size analysis with laser diffraction, point counting of particles by optical microscopy, and X-Ray Diffraction (XRD). To simulate the airflow and the dispersion of particulate matter (PM 10), a computational fluid dynamics code called MISKAM (Mikroskaliges Strömung-und Ausbreitungsmodell-microscale flow and dispersion model for built up areas) was used. The results suggest that dust deposition is controlled by the flow pattern. Analyzed dust samples contain wind driven mineral grains (quartz, dolomite) and also human activity related pollutants such as fly ash and soot.

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“…6). Flow patterns typical for urban canopy (Balczó and Lajos, 2015) were also observed in our simulation.…”

Section: Resultssupporting

confidence: 76%

Dust deposition, microscale flow- and dispersion model of particulate matter, examples from the city center of Budapest

Farkas¹,

Török²

2019

Időjárás

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“…This type of application does not have to be limited to nefarious events; city planners may be interested in air quality control as it relates to pollution [6][7][8][9][10][11][12]. For example, Huber et al [9] use FLUENT to simulate the events of September 11, 2001 in Manhattan in order to study the transport and dispersion of smoke and particles into the surrounding metropolitan area.…”

Section: 7mentioning

confidence: 99%

An Automatic Parallel Octree Grid Generation Software with an Extensible Solver Framework and a Focus on Urban Simulation

Hereth

2017

55th AIAA Aerospace Sciences Meeting

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The development of an automatic, dynamic, parallel, Cartesian, linear forest-of-octree grid generator and partial differential equation (PDE) solver framework is presented. This research is bundled into an application programmed with C++ which uses MPI for distributed parallelism. The application is named paros which stands for PARallel Octree Solver. In its current implementation, the application provides a 'zeroth' order representation of the target geometry, and as such, no cutcell algorithm, projection method, or immersed boundary condition are implemented. In this case, 'zeroth' order means that no geometry is ever exactly represented in the final computational mesh: an octree element is either completely in the domain or entirely outside of it. Any element that contains or is intersected by a geometry facet is removed from the final mesh which results in a 'blocky' or 'stepped' geometry representation and simplifies boundary computations. The computational octree mesh creation is completely parallel and automated. The algorithm is dynamic in the sense that it is repartitioned dynamically throughout the grid generation process to maintain optimal load balancing during all phases of the mesh genesis. A linear octree data structure is used to store the octree mesh elements and is leveraged for optimal load balancing. An additional hierarchical octree is used to significantly improve algorithms that suffer from this linear storage paradigm. This work focuses on, but is not limited to, applications related to urban simulations and may be applied to plume/contaminant propagation. Within the PDE solution framework a cell-centered, incompressible, unsteady, Navier-Stokes solver with an energy term to account for thermal buoyancy iv is implemented and validated using canonical test cases. Turbulence closure is implemented in the form of the Smagorinski large eddy simulation (LES) model. The parallel grid generation and solution process is tested on a large scale cityscape geometry and shown to be robust and efficient.Additionally, an implementation of the compressible Navier-Stokes equations is coded within the framework. The framework is extensible such that adding other types of numerical PDE solvers should not be difficult. Other features including adaptive mesh refinement (AMR) and contaminant transport functionality are included. v DEDICATION This research and dissertation is dedicated to my amazing wife: Sarah Dawn Hereth, my two handsome sons: Gabriel Alan and Jude Isaiah, and my two beautiful daughters: Lael Sophia and Emery Dawn. Without their love and patience, I could never have completed this endeavor.I also wish to dedicate this work to my mother, Brenda Louise Hereth, who left us too early; she never doubted my ability and intelligence, and continually encouraged and pushed me to better myself and pursue knowledge. She would be beyond proud if she were with us today. I miss you Mom. vi ACKNOWLEDGEMENTSThis dissertation brings to fruition a long journey that began over nine years ago. Over these years I...

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Detector configuration optimization based on wind tunnel tests using normalized adjoint concentration gradient for urban spatial source parameters estimation

Wang,

Zhou,

Kikumoto

et al. 2024

Building and Environment

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Flow and Dispersion Phenomena in a Simplified Urban Square

Abstract: Abstract

Cited by 8 publications

References 23 publications

Dust deposition, microscale flow- and dispersion model of particulate matter, examples from the city center of Budapest

Dust deposition, microscale flow- and dispersion model of particulate matter, examples from the city center of Budapest

An Automatic Parallel Octree Grid Generation Software with an Extensible Solver Framework and a Focus on Urban Simulation

Detector configuration optimization based on wind tunnel tests using normalized adjoint concentration gradient for urban spatial source parameters estimation

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