Numerical simulation of dispersion in an urban street canyon

Comparison between steady and fluctuating boundary conditions

S. M. Kwa, S. M. Salim

Research output: Contribution to journalArticle

Abstract

Over the years, the reliance on CFD to investigate air flow and pollutant dispersion has increased significantly and the majority of these studies have employed Steady Wind Boundary Conditions (SWBC) at the inlet of the computational domain. In reality, wind fluctuates both spatially and temporally and the numerical simulations do not accurately represent field or experimental measurements when the inlet condition is assumed to be constant. Therefore, the aim of the current research is to address the limitations of these existing studies, by developing Fluctuating Wind Boundary Conditions (FWBC). The FWBC are then compared to SWBC in order to determine their suitability in the investigation of air flow and pollutant dispersion in urban street canyons. Three-dimensional (3D) numerical simulations are performed using Large Eddy Simulation (LES). The FWBC produces more realistic results when compared to the frequently employed SWBC.

Original languageEnglish
Pages (from-to)55-64
Number of pages10
JournalEngineering Letters
Volume23
Issue number1
Publication statusPublished - 2015

Fingerprint

street canyon
boundary condition
simulation
airflow
large eddy simulation
comparison

Keywords

  • Computational Fluid Dynamics (CFD)
  • Fluctuating Wind Boundary Condition (FWBC)
  • Large Eddy Simulation (LES)
  • Pollutant dispersion
  • Urban street canyon

Cite this

@article{fb233ce73b904de6b72261e5dc90b3ca,
title = "Numerical simulation of dispersion in an urban street canyon: Comparison between steady and fluctuating boundary conditions",
abstract = "Over the years, the reliance on CFD to investigate air flow and pollutant dispersion has increased significantly and the majority of these studies have employed Steady Wind Boundary Conditions (SWBC) at the inlet of the computational domain. In reality, wind fluctuates both spatially and temporally and the numerical simulations do not accurately represent field or experimental measurements when the inlet condition is assumed to be constant. Therefore, the aim of the current research is to address the limitations of these existing studies, by developing Fluctuating Wind Boundary Conditions (FWBC). The FWBC are then compared to SWBC in order to determine their suitability in the investigation of air flow and pollutant dispersion in urban street canyons. Three-dimensional (3D) numerical simulations are performed using Large Eddy Simulation (LES). The FWBC produces more realistic results when compared to the frequently employed SWBC.",
keywords = "Computational Fluid Dynamics (CFD), Fluctuating Wind Boundary Condition (FWBC), Large Eddy Simulation (LES), Pollutant dispersion, Urban street canyon",
author = "Kwa, {S. M.} and Salim, {S. M.}",
year = "2015",
language = "English",
volume = "23",
pages = "55--64",
journal = "Engineering Letters",
issn = "1816-093X",
publisher = "International Association of Engineers",
number = "1",

}

Numerical simulation of dispersion in an urban street canyon : Comparison between steady and fluctuating boundary conditions. / Kwa, S. M.; Salim, S. M.

In: Engineering Letters, Vol. 23, No. 1, 2015, p. 55-64.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Numerical simulation of dispersion in an urban street canyon

T2 - Comparison between steady and fluctuating boundary conditions

AU - Kwa, S. M.

AU - Salim, S. M.

PY - 2015

Y1 - 2015

N2 - Over the years, the reliance on CFD to investigate air flow and pollutant dispersion has increased significantly and the majority of these studies have employed Steady Wind Boundary Conditions (SWBC) at the inlet of the computational domain. In reality, wind fluctuates both spatially and temporally and the numerical simulations do not accurately represent field or experimental measurements when the inlet condition is assumed to be constant. Therefore, the aim of the current research is to address the limitations of these existing studies, by developing Fluctuating Wind Boundary Conditions (FWBC). The FWBC are then compared to SWBC in order to determine their suitability in the investigation of air flow and pollutant dispersion in urban street canyons. Three-dimensional (3D) numerical simulations are performed using Large Eddy Simulation (LES). The FWBC produces more realistic results when compared to the frequently employed SWBC.

AB - Over the years, the reliance on CFD to investigate air flow and pollutant dispersion has increased significantly and the majority of these studies have employed Steady Wind Boundary Conditions (SWBC) at the inlet of the computational domain. In reality, wind fluctuates both spatially and temporally and the numerical simulations do not accurately represent field or experimental measurements when the inlet condition is assumed to be constant. Therefore, the aim of the current research is to address the limitations of these existing studies, by developing Fluctuating Wind Boundary Conditions (FWBC). The FWBC are then compared to SWBC in order to determine their suitability in the investigation of air flow and pollutant dispersion in urban street canyons. Three-dimensional (3D) numerical simulations are performed using Large Eddy Simulation (LES). The FWBC produces more realistic results when compared to the frequently employed SWBC.

KW - Computational Fluid Dynamics (CFD)

KW - Fluctuating Wind Boundary Condition (FWBC)

KW - Large Eddy Simulation (LES)

KW - Pollutant dispersion

KW - Urban street canyon

M3 - Article

VL - 23

SP - 55

EP - 64

JO - Engineering Letters

JF - Engineering Letters

SN - 1816-093X

IS - 1

ER -