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FLIE Report Summary

Project ID: EVG1-CT-2000-00025
Funded under: FP5-EESD
Country: Norway

FLACS CFD-software aerosol R&D version

A Computation Fluid Dynamics (CFD) model that can be used to simulate the flow from a well-defined droplet jet has been developed, consolidated and to a certain degree validated. The important effects due to interaction with the surrounding gas and collisions between droplets (drag, break-up, coalescence, evaporation, condensation) are modelled. The model is also able to represent a discrete size distribution of droplets. Further modelling of the flashing source is needed to complete the CFD model.

The work on the CFD model was done within an existing code called FLACS (Flame Acceleration Simulator). The FLACS code was initially developed at CMI (Chr. Michelsen Institute), and has been maintained and further developed at CMR (Chr. Michelsen Research) and GexCon. It can be used to simulate ventilation, gas release and dispersion, and gas explosions in complex geometries like offshore platforms and onshore industrial plants.

FLACS is a commercial product, and several licensing arrangements ranging from fully paid commercial to almost free academic licenses are available. More information may be obtained from GexCon's web site A general model for handling of droplets or small particles in FLACS has been implemented. The model handles particular entities in conjunction with release, dispersion and explosion phenomena as a continuous phase.

Several existing developmental models in FLACS were used as the starting point for a new unified model:
-Water-spray flow and droplet break-up model (Anders Hallanger, CMR)
-Dust flow and combustion/explosion model (Bjørn J. Arntzen, GexCon)
-Pool evaporation model (Hans-Christen Salvesen, GexCon)
-Radiation model (Idar E. Storvik, GexCon and Ivar Øyvind Sand, CMR)
-Local multilevel grid refinement technique (Thor Gjesdal, GexCon)

The new development of the FLIE related part of the FLACS code has been financed through two projects with sponsors from the industry and 50% financing from the EC. There are still problems with the model for evaporation and boiling of droplets in the code, further work is required to bring this part to function properly.

A large number of tests have been performed in order to verify that the particle/droplet models in FLACS are correct. Comparison with analytical where that is possible and with available experimental data are important parts of the model development and validation. An advanced prototype CFD tool was developed, and this has a potential of being the basis for a commercially available tool in the coming years. GexCon has the intention to develop this prototype further to a commercial grade tool, and to make it available to the industry and consultants under the existing license model used for the FLACS package.

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