Validation of the CFAST and FDS Fire Models with Full-Scale Nuclear Power Plant Compartment Fire Experiments (ICFMP Benchmark Exercise # 3), Deytec, Inc. USA Technical Report No. 2009-01, March 2009.
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Abstract
A comprehensive series of full-scale fire experiments was designed to simulate single compartment fire scenarios in nuclear power plants. The main purpose of the test series was to provide data to validate fire models over a wide range of conditions. The fire size and location, type of fuel, natural and mechanical ventilation, and cable type and configuration were varied to provide a comprehensive data set for model validation. The CFAST (Consolidated Model for Fire Growth and Smoke Transport), a two-zone fire model and; FDS (Fire Dynamics Simulator), a computational fluid dynamics fire model, have been validated using the data from the these full-scale compartment fire experiments. Both CFAST and FDS demonstrated capabilities for modeling the phenomena in the transients investigated in this validation study. The prediction of open door tests is more simple and accurate. This is because the extinction models in CFAST and FDS employ simple algorithms for predicting fire extinction. Generally, the predictions of global parameters such as hot gas layer temperature and interface height, oxygen, carbon dioxide, carbon monoxide, and smoke concentrations, and door heat and mass flows are more accurate. Larger discrepancies in the predictions of heat fluxes and target
responses by both codes were observed in this study. Improvements in the calculation of heat fluxes, coupling of the mechanical ventilation system to the fire compartment, near-field environment, and fire extinction will improve the predictive capabilities of both codes.
Report: 232 pages
A comprehensive series of full-scale fire experiments was designed to simulate single compartment fire scenarios in nuclear power plants. The main purpose of the test series was to provide data to validate fire models over a wide range of conditions. The fire size and location, type of fuel, natural and mechanical ventilation, and cable type and configuration were varied to provide a comprehensive data set for model validation. The CFAST (Consolidated Model for Fire Growth and Smoke Transport), a two-zone fire model and; FDS (Fire Dynamics Simulator), a computational fluid dynamics fire model, have been validated using the data from the these full-scale compartment fire experiments. Both CFAST and FDS demonstrated capabilities for modeling the phenomena in the transients investigated in this validation study. The prediction of open door tests is more simple and accurate. This is because the extinction models in CFAST and FDS employ simple algorithms for predicting fire extinction. Generally, the predictions of global parameters such as hot gas layer temperature and interface height, oxygen, carbon dioxide, carbon monoxide, and smoke concentrations, and door heat and mass flows are more accurate. Larger discrepancies in the predictions of heat fluxes and target
responses by both codes were observed in this study. Improvements in the calculation of heat fluxes, coupling of the mechanical ventilation system to the fire compartment, near-field environment, and fire extinction will improve the predictive capabilities of both codes.
Report: 232 pages