A novel approach to simulate pollutant dispersion in the built environment: Transport-based recurrence CFD

Yaxing Du, Bert Blocken, Stefan Pirker (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The large-scale practical application of Large-Eddy Simulation (LES) for predicting long-term wind flow and pollutant dispersion in urban areas is inhibited mainly by the associated very large computational costs. To overcome this difficulty, the present study, for the first time, applies transport-based recurrence Computational Fluid Dynamics (rCFD) to simulate atmospheric pollutant dispersion around a building. A novel diffusion model is proposed to accurately predict pollutant transport with rCFD. To illustrate the feasibility and advantages of rCFD, pollutant dispersion around an isolated cubical building with a rooftop vent, immersed in neutral atmospheric boundary layer flow is used as a case study and both LES and rCFD simulations are conducted. It is shown that rCFD simulation results agree well with those from LES both in terms of mean and fluctuating concentrations while the simulation wall-clock time drops from 222 h to 16 min. The application of four evaluation metrics (FAC2, FB, NMSE and R) indicates very good agreement between LES and rCFD results. Another major advantage of rCFD is that different pollutant events can be simulated promptly once the database has been stored for a given flow configuration, as shown by the comparison of LES and rCFD results for two other cases with different release locations. This study extends the application of transport-based rCFD to pollutant dispersion in the built environment and indicates that rCFD is a promising approach to facilitate the large-scale practical application of LES for this type of applications.

Original languageEnglish
Article number106604
Number of pages13
JournalBuilding and Environment
Volume170
DOIs
Publication statusPublished - Mar 2020

Fingerprint

computational fluid dynamics
pollutant
Computational fluid dynamics
large eddy simulation
Large eddy simulation
simulation
pollutant dispersion
built environment
Atmospheric boundary layer
Boundary layer flow
Vents
Computer simulation
pollutant transport
urban area
Clocks
atmospheric pollution
boundary layer
event
costs
evaluation

Keywords

  • Large eddy simulation (LES)
  • Novel diffusion model
  • Pollutant dispersion
  • Transport-based recurrence CFD (rCFD)
  • Urban environment

Cite this

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title = "A novel approach to simulate pollutant dispersion in the built environment: Transport-based recurrence CFD",
abstract = "The large-scale practical application of Large-Eddy Simulation (LES) for predicting long-term wind flow and pollutant dispersion in urban areas is inhibited mainly by the associated very large computational costs. To overcome this difficulty, the present study, for the first time, applies transport-based recurrence Computational Fluid Dynamics (rCFD) to simulate atmospheric pollutant dispersion around a building. A novel diffusion model is proposed to accurately predict pollutant transport with rCFD. To illustrate the feasibility and advantages of rCFD, pollutant dispersion around an isolated cubical building with a rooftop vent, immersed in neutral atmospheric boundary layer flow is used as a case study and both LES and rCFD simulations are conducted. It is shown that rCFD simulation results agree well with those from LES both in terms of mean and fluctuating concentrations while the simulation wall-clock time drops from 222 h to 16 min. The application of four evaluation metrics (FAC2, FB, NMSE and R) indicates very good agreement between LES and rCFD results. Another major advantage of rCFD is that different pollutant events can be simulated promptly once the database has been stored for a given flow configuration, as shown by the comparison of LES and rCFD results for two other cases with different release locations. This study extends the application of transport-based rCFD to pollutant dispersion in the built environment and indicates that rCFD is a promising approach to facilitate the large-scale practical application of LES for this type of applications.",
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A novel approach to simulate pollutant dispersion in the built environment : Transport-based recurrence CFD. / Du, Yaxing; Blocken, Bert; Pirker, Stefan (Corresponding author).

In: Building and Environment, Vol. 170, 106604, 03.2020.

Research output: Contribution to journalArticleAcademicpeer-review

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