Predicting large-scale pool fire dynamics using an unsteady flamelet- and large-eddy simulation-based model suite

2021 ◽  
Vol 33 (8) ◽  
pp. 085109
Author(s):  
Stefan P. Domino ◽  
John Hewson ◽  
Robert Knaus ◽  
Mike Hansen
Keyword(s):  
Large Eddy Simulation ◽  
Large Scale ◽  
Pool Fire ◽  
Fire Dynamics ◽  
Eddy Simulation ◽  
Simulation Based ◽  
Large Eddy

scholarly journals Large-eddy Simulation Of A Large-scale Methane Pool Fire

2005 ◽  
Vol 8 ◽  
pp. 963-974 ◽  
Author(s):  
S. Ferraris ◽  
J. Wen ◽  
S. Dembele
Keyword(s):  
Large Eddy Simulation ◽  
Large Scale ◽  
Pool Fire ◽  
Eddy Simulation ◽  
Large Eddy

scholarly journals Sensitivity of local air quality to the interplay between small- and large-scale circulations: a large-eddy simulation study

2017 ◽  
Vol 17 (11) ◽  
pp. 7261-7276 ◽  
Author(s):  
Tobias Wolf-Grosse ◽  
Igor Esau ◽  
Joachim Reuder
Keyword(s):  
Air Pollution ◽  
Air Quality ◽  
Large Eddy Simulation ◽  
Air Pollutants ◽  
Large Scale ◽  
Wind Speeds ◽  
Street Level ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Air Pockets

Abstract. Street-level urban air pollution is a challenging concern for modern urban societies. Pollution dispersion models assume that the concentrations decrease monotonically with raising wind speed. This convenient assumption breaks down when applied to flows with local recirculations such as those found in topographically complex coastal areas. This study looks at a practically important and sufficiently common case of air pollution in a coastal valley city. Here, the observed concentrations are determined by the interaction between large-scale topographically forced and local-scale breeze-like recirculations. Analysis of a long observational dataset in Bergen, Norway, revealed that the most extreme cases of recurring wintertime air pollution episodes were accompanied by increased large-scale wind speeds above the valley. Contrary to the theoretical assumption and intuitive expectations, the maximum NO2 concentrations were not found for the lowest 10 m ERA-Interim wind speeds but in situations with wind speeds of 3 m s−1. To explain this phenomenon, we investigated empirical relationships between the large-scale forcing and the local wind and air quality parameters. We conducted 16 large-eddy simulation (LES) experiments with the Parallelised Large-Eddy Simulation Model (PALM) for atmospheric and oceanic flows. The LES accounted for the realistic relief and coastal configuration as well as for the large-scale forcing and local surface condition heterogeneity in Bergen. They revealed that emerging local breeze-like circulations strongly enhance the urban ventilation and dispersion of the air pollutants in situations with weak large-scale winds. Slightly stronger large-scale winds, however, can counteract these local recirculations, leading to enhanced surface air stagnation. Furthermore, this study looks at the concrete impact of the relative configuration of warmer water bodies in the city and the major transport corridor. We found that a relatively small local water body acted as a barrier for the horizontal transport of air pollutants from the largest street in the valley and along the valley bottom, transporting them vertically instead and hence diluting them. We found that the stable stratification accumulates the street-level pollution from the transport corridor in shallow air pockets near the surface. The polluted air pockets are transported by the local recirculations to other less polluted areas with only slow dilution. This combination of relatively long distance and complex transport paths together with weak dispersion is not sufficiently resolved in classical air pollution models. The findings have important implications for the air quality predictions over urban areas. Any prediction not resolving these, or similar local dynamic features, might not be able to correctly simulate the dispersion of pollutants in cities.

Comparative Large Eddy Simulation study of a large-scale buoyant fire

2011 ◽  
Vol 47 (9) ◽  
pp. 1197-1208 ◽  
Author(s):  
G. H. Yeoh ◽  
S. C. P. Cheung ◽  
J. Y. Tu ◽  
T. J. Barber
Keyword(s):  
Large Eddy Simulation ◽  
Simulation Study ◽  
Large Scale ◽  
Eddy Simulation ◽  
Large Eddy

Large-Eddy Simulation-Based Retrieval of Dissipation from Coherent Doppler Lidar Data

2010 ◽  
Vol 136 (1) ◽  
pp. 45-57 ◽  
Author(s):  
Raghavendra Krishnamurthy ◽  
Ronald Calhoun ◽  
Harindra Fernando
Keyword(s):  
Large Eddy Simulation ◽  
Lidar Data ◽  
Doppler Lidar ◽  
Eddy Simulation ◽  
Coherent Doppler Lidar ◽  
Simulation Based ◽  
Large Eddy
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