Original upload date: Sun, 06 Apr 2025 02:00:00 GMT
Archive date: Fri, 11 Jul 2025 10:58:06 GMT
Large Eddy Simulation (LES) of a fireball created from silicone oil droplets with the Fire Dynamics Simulator (FDS) v 6.9.1 - https://pages.nist.gov/fds-smv/. The total amount of silicone oil is 250 k
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g. Coarse droplets of constant diameter (2000 microns) are injected in five different directions over a course of 5 s with a prescribed velocity (on the order of 30 m/s). Ignition of the droplets is achieved by setting a high temperature (10000 C) in a surrounding surface for a short period of time period (0.2 s) essentially trying to emulate an electric arc event. The AIT of silicone oil is set to 350 C. A westerly wind of 3 m/s is considered. The video shows the 3D smoke - HRRPUV. The computational domain has dimensions of 200 m x 200 m x 200 m. The duration of the numerical simulation is 15 s.
Note: For those wondering, the electric arc (initial heat source) does not ignite all the silicone oil droplets at once. It's not even possible since the duration of the electric arc event (0.2 s) is much smaller than the duration of the injection of droplets (5 s). However, the electric arc event is sufficient to heat up, vaporize the liquid fuel to gas and eventually ignite a small portion of the silicone oil droplets. The resulting fire is sufficiently big and provides the necessary heat feedback (through convection and radiation) to progressively heat up, vaporize the liquid fuel to gas and eventually ignite the rest of the silicone oil droplets as well.
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#CFD #FDS #fireball #fire #silicone #siliconeoil #modeling #LES #simulation