Data obtained from experiments carried out at the FM Global large scale deflagration chamber have been used to further develop the multi-phenomena deflagration model. This model has been under development at the University of Ulster during the last decade. This expansion of the deflagration model accounts for the inclusion of Rayleigh-Taylor (RT) instability, as an additional time-dependent combustion enhancing mechanism. The previous version of the LES deflagration model without the addition

more »

... RT instability underpredicted the experimental results, due to the model not properly capturing the external deflagration observed during the experiment. Following this underprediction, RT instability was identified as playing a significant role in combustion enhancement as the flame front accelerated towards the vent and during combustion outside the enclosure. The implementation of a mechanism to account for RT instability, in the form of an additional time-dependent flame wrinkling factor, led to an intensification of the external deflagration. This resulted in closer agreement between the simulated and experimental pressure transients.