Accuracy of Sub-grid Models in Internal Fire Whirl Modeling by Large Eddy Simulation

In this paper, a fire whirl in a high-rise room with a gap in one corner is investigated. Methanol fuel is intended. Large Eddy Simulation method was used and the OpenFoam software, one-equation sub-grid model and eddy dissipation combustion model were performed. Results in two different conditions (fuel bed of 5.8 and 7 cm) were obtained and compared with the experimental results. By comparing the numerical results with the experimental results, it is observed that the numerical results of the mean temperature in the middle and corner of the room are consistent with the experimental results. The results of the various sub-grid models in the center line show that the WALE model fits better with the experimental results and also the performance of the two one-equation and Smagorinsky sub-grid models is lower than WALE. On average, the relative error percentage of the WALE model is 7.3 percent, while each of the Smagorinsky and one-equation models have error of 8 and 8.9 percent compared to the experimental results, respectively. The results of the three sub-grid models in the corner are not significantly different and are more consistent with the experimental results. The corner line error of the room being less than 8%.