Heat release rate (HRR) of the design fire is the most important parameter in assessing building fire hazards. However, HRR in\r\nroom fire was only studied by computational fluid dynamics (CFD) in most of the projects determining fire safety provisions by\r\nperformance-based design. In contrast to ten years ago, officers in the Far East are now having better knowledge of CFD. Two\r\ncommon questions are raised on CFD-predicted results on describing free boundaries; and on computing grid size. In this work,\r\npredicting HRR by the CFD model was justified with experimental room pool fire data reported earlier. The software fire dynamics\r\nsimulator (FDS) version 5 was selected as the CFD simulation tool. Prescribed input heating rate based on the experimental results\r\nwas used with the liquid fuel model in FDS. Five different free boundary conditions were investigated to predict HRR. Grid\r\nsensitivity study was carried out using one stretched mesh and multiple uniform meshes with different grid sizes. As it is difficult\r\nto have the entire set of CFD predicted results agreed with experiments, macroscopic flow parameters on the mass flow rate through\r\ndoor opening predicted by CFD were also justified by another four conditions with different ventilation factors.
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