- Author
- Farouk, B.
- Title
- Numerical Simulation of Fire Induced Flows: Some Recent Observations. BFRL Fire Research Seminar. VHS Video.
- Coporate
- Drexel Univ., Philadelphia, PA
- Report
- Video, May 30, 2000,
- Keywords
- numerical simulation
- Identifiers
- Large-Eddy Simulation (LES)
- Abstract
- Application of the 'large eddy simulation' (LES) techniques to fires and fire induced flows and smoke transport is relatively recent. Though the demand on computational power is somewhat greater than the more traditional techniques of modeling fires, the application of LES techniques to modeling fire plumes and enclosure fires has resulted in remarkable extraction of temporal and spatial details. In the present version of the model (developed at NIST), large scale eddies are directly simulated and sub-grid scale motion is represented with a Smagorinsky model. The fire is prescribed via introduction of thermal elements, in a manner consistent with a mixture-fraction-based approach to combustion. Several applications of the above model of fire simulation will be presented. These include naturally occurring fire whirls; fire and smoke spread in a 3-room suite and smoke transport and coagulation prediction for a standard test fire for smoke detectors (EN 54, part 9). The application of the model to these diverse fire scenarios has not only provided insight to the complex thermally driven flow problems, but has also revealed areas for further improvement of the predictive model itself. The nature and role of radiation heat transfer in fires will also be reviewed. Recent results of modeling gray and non-gray gas radiation/convection interactions in participating media will be presented. Candidate models of radiative interactions within the framework of the 'large eddy simulation' technique for predicting fires will be reviewed.