UC-IEG-II
From EGI Knowledge Base
Use Case title: Evolution of pollution clouds in the atmosphere
Short description: This application provides pollution assessment for regulation and quick help for decision makers in case of real accident. The application models dispersion of the pollutant in the atmosphere as the movement of individual independent particles by use a Lagrangian model. The term “particle” denotes any air pollutant in the volume of air located to the certain position of the space. The particles travel with the wind and the particle trajectory and particle composition reflects natural phenomena such as turbulent diffusion, dry deposition, wet deposition caused by the rain and radioactive decay.
Actors involved:
The figure presents the visualization of dispersion of pollutant after its release. You can also watch the atmospheric transport and diffusion under changing weather conditions, specifically wind direction.
To calculate the individual trajectories, a certain number of particles denoting air pollutants are distributed among many processors. For every particle the position is stored in a file which is used for visualization purposes. In addition, volume and surface concentrations are computed at specific 3D grid points.
The Interactivity capabilities of this application are about sending the visualization of the output (images) to the client as it is computed, enabling the user to watch the simulation evolve. When the user gives a command, particles are split, thus doubling their number.
