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Accident Risk and Consequences, Hazardous Gases and Aerosol Dispersion

Accident Risk and Consequences Hazardous Gases and Aerosol Dispersion


A large number of industrial accidents start as a leak of some toxic or flammable gas/ aerosol in industrial or urban atmosphere. For an early control of the accident, the best strategy of risk control is right assessment of the extent of the gas cloud from any leaking equipment or storage tank.

fluidyn-PANEPR, a 3D accidental dispersion modelling software uses fluid mechanics for dispersion of gas or particles/ droplets over a complex terrain.


Applications :

  • 3D numerical modelling of atmospheric dispersion of gas leaks in industrial processes (chlorine, ammonia, LPG) and smoke dispersion due to fire on complex terrains
  • Evaluation of toxic effects threshold zones, explosive cloud volumes and visibility
  • Quantitatively reliable dispersion of gas ( heavy / light / hot / neutral ), droplets, radio-nuclides and particles as it uses basic laws of conservation of mass, momentum and energy in the form of Navier-Stokes equations.


Advantages :

  • Simultaneous near and far field modelling with the help of embedded structured / unstructured meshes,
  • Takes into account all the complexity of the topography which may influence gas dispersion: all types of obstacles, buildings, forests, water bodies etc..,
  • Simple & quick terrain model creation with background of BMP/GIS/dxf/ ortho-photo map,
  • Jet effect for leak source estimation, pollutant buoyancy, heat convection,
  • Weather data can be used even from distant weather stations,
  • Atmospheric Boundary, Heat inversion layers are calculated by proven models,
  • 3D wind fields, temperature and turbulence calculated at various scales from a few meters to a few hundreds of meters simultaneously,
  • Various source types (pipeline leaks, pool evaporation, roof vents, tank explosion,..),
  • Dispersion solver according to each situation: Eulerian / Lagrangian / Puff models,
  • Transient evolution of pollutant clouds (concentration contours / iso-surfaces / toxic doses...),
  • Reliable Results, even for complex cases with the help of high order numerical solvers,
  • Integration of chemical reaction models,
  • Fast calculation time allowing even Real time faster than accident simulation,
  • Transport, deposition and decomposition of radioactive particles (radon, iodine 131, uranium 238...)
  • Dose calculations for various pollutants


Accident Risk and Consequences Hazardous Gases and Aerosol Dispersion