Numerical analysis of a water mist spray: The importance of various numerical and physical parameters, including the drag force

This paper presents a comprehensive set of numerical simulations for the characterization water mist spray emerging from nozzle positioned at 2.2 m floor level and operating pressure 1.0 MPa. The droplet volume-median diameter is about 90 μm half-angle around 42°. shape visualized using laser sheet flux density distribution on ground measured with ‘bucket’ test. An initial study Fire Dynamics Simulator (FDS) has been carried out by varying several physical models parameters (e.g., cell size turbulence modelling). simulated sprays were very narrow (in comparison to actual spray), yielding overestimations peak 430% (on average). Subsequently, it was found that there significant impact drag force modelling because hand dense (near nozzle). ad-hoc reduction coefficient constant value leads better results. current calls upon new developments aerodynamic in sprays.