CFD simulations of ammonia dispersion using “dynamic” boundary conditions

Verification of CFD pollution dispersion modelling based on experimental data

“…The pseudo transient and steady state approaches were described in Labovský and Jelemenský (2010) and it was established that the application of the steady state approach leads to significant overprediction of the maximal centreline concentration and to considerable narrowing of the width of the cloud. However, it should be mentioned that simulating a steady state release only should be the first choice in conservative risk analysis.…”

“…The transitional periodic boundary condition allows air to escape through the side boundaries, moreover, at the same time, identical amount of air enters from the opposite periodic plane. Using this type of side boundary condition, it is possible to generate a very realistic environment for atmospheric dispersion (Labovský & Jelemenský, 2010). It is very important to use a wide enough computation grid, when using the periodic boundary condition.…”

“…Therefore, these data were used in each solution step to generate the corresponding vertical wind velocity profile which was used in the inlet boundary condition. Another important parameter strongly affecting the ammonia cloud behaviour is the wind direction (Labovský & Jelemenský, 2010).…”

“…Thanks to the increasing CPU power, geometrically complex environment can be simulated giving reliable predictions of the obstacles influence on the gas dispersion behaviour. CFD results were successfully validated against experimental field data (Ki sa & Jelemenský, 2009;Labovský & Jelemenský, 2010;Rigas & Sklavounos, 2006) and they were also used for complex geometries analysis (Delaunay, 1996;McBride, Reeves, Vanderheyden, Lea, & Zhou, 2001;Scargiali, Di Rienzo, Ciofalo, Grisafi, & Brucato, 2005).…”

Computational fluid dynamics simulation of carbon dioxide dispersion in a complex environment

“…Using CFD for dispersion modelling in all its complexity (terrain topography, presence of obstacles, etc.) is a relatively recent development (Hsieh et al, 2013;Kiša and Jelemenský, 2009;Labovský and Jelemenský, 2010;Liu et al, 2014;Mazzoldi et al, 2008Mazzoldi et al, , 2011Tauseef et al, 2011;Xing et al, 2013). In the past decades, a few researchers have used generalpurpose CFD packages (such as Fluent or CFX) for atmospheric dispersion modelling (Hsieh et al, 2013;Labovský and Jelemenský, 2011;Mazzoldi et al, 2011;Xing et al, 2013), while others have relied on CFD software packages (such as fluidyn-PANACHE) designed specifically for atmospheric dispersion modelling Mazzoldi et al, 2008).…”