There are many big construction projects with difficulties to comply with the fire codes while developing in the Far East. As it is difficult to have the entire set of CFD predicted results agreed with experiments, macroscopic flow parameters on the mass flow rate through door opening predicted by CFD were also justified by another four conditions with different ventilation factors. Grid sensitivity study was carried out using one stretched mesh and multiple uniform meshes with different grid sizes. Five different free boundary conditions were investigated to predict HRR.

Prescribed input heating rate based on the experimental results was used with the liquid fuel model in FDS. The software fire dynamics simulator (FDS) version 5 was selected as the CFD simulation tool. In this work, predicting HRR by the CFD model was justified with experimental room pool fire data reported earlier. Two common questions are raised on CFD-predicted results on describing free boundaries and on computing grid size. In contrast to ten years ago, officers in the Far East are now having better knowledge of CFD. However, HRR in room fire was only studied by computational fluid dynamics (CFD) in most of the projects determining fire safety provisions by performance-based design. Heat release rate (HRR) of the design fire is the most important parameter in assessing building fire hazards.

Pyrosim multiple grid sizes