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Comparison of FDS Model Predictions With FM/SNL Fire Test Data. | NIST

The Fire Dynamics Simulator (FDS), a recently developed field fire model based on large eddy simulation (LES), is used to simulate seven full-scale fire tests. The fire tests were conducted in a large mechanically ventilated enclosure with dimensions of 18.3 m x 12.2 m x 6.1 m high, with air injection rates ranging from 1 to 12 air changes per hour (ACH), and fire heat release rates ranging from 0 to 2 MW. Test measurements and simulation predictions are compared. Comparison methods are presented and discussed. Simulations are run with 6,000, 48,000, and 162,000 grid cells to evaluate the influence of grid resolution on prediction accuracy. One test series was run on six different personal computers to explore the effects of different hardware configurations on simulation times. A grid dependent plume study was performed to investigate the relationship of grid resolution and plume temperature predictions. Increasing the number of grid cells in the plume region does not improve temperature predictions significantly, but does result in more accurate simulation of plume turbulent structures.