Download CFAST - Consolidated Model of Fire Growth and Smoke by Jones, Walter W.; Peacock, Richard D.; Forney, Glenn P.; PDF
By Jones, Walter W.; Peacock, Richard D.; Forney, Glenn P.; Reneke, Paul A.
The modeling equations utilized in CFAST take the mathematical type of an preliminary price challenge for a procedure of standard differential equations (ODEs). those equations are expecting as capabilities of time amounts corresponding to strain, layer top and temperatures given the buildup of mass and enthalpy within the layers. The CFAST version then involves a suite of ODEs to compute the surroundings in every one compartment and a suite of algorithms to compute the mass and enthalpy resource phrases required via the ODEs. This 2009 record offers the technical documentation for CFAST in addition to major info on validation of the version. The algorithms, systems, and machine courses defined during this record represent a strategy for predicting many of the results caused by a prescribed fireplace. they've been compiled from the easiest wisdom and knowing presently on hand, yet have very important obstacles that has to be understood and thought of by means of the consumer. this system is meant to be used via folks powerfuble within the box of fireplace security and with a few familiarity with own pcs. it truly is meant as an relief within the hearth defense decision-making technique.
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Additional info for CFAST - Consolidated Model of Fire Growth and Smoke Transport (Version 6) Technical Reference Guide
Sample text
A range of such validation exercises is discussed in chapter 6. 2 List of Quantities Predicted by the Model CFAST provides a prediction of the plume centerline, gas layer, and boundary temperatures, target temperatures, species concentration (including soot volume fraction), layer height, fire size and flame length, floor pressure, flow and fire size at vents, and heat flux (both radiative and convective). There is a more extensive discussion of the output in the CFAST users guide. 3 Degree of Accuracy Required for Each Output Quantity The degree of accuracy for each output variable required by the user is highly dependent on the technical issues associated with the analysis.
The differences are primarily the selection rules for the source of the gases or whether the resultant plume enters the lower or upper layer of each compartment. There is a special case of horizontal flow for long corridors. A corridor flow algorithm is incorporated to calculate the time delay from when a plume enters a compartment to when the effluent is available for flow into adjacent compartments. 5: Vent opening size fraction as a function of time. Flow through vents can be modified, that is turned on or off.
G. df, included with the model. These properties come directly from handbook values for typical materials [10]. 8 Model Results The output of CFAST are the sensible variables that are needed for assessing the environment in a building subjected to a fire. Once the simulation is complete, CFAST produces an output file containing all of the solution variables. Typical outputs include (but are not limited to) the following: • environmental conditions in the room (such as hot gas layer temperature; plume centerline temperature; oxygen and smoke concentration; and ceiling, wall, and floor temperatures) • heat transfer-related outputs to walls and targets (such as incident convective, radiated, and total heat fluxes) • fire intensity and flame height • flow velocities through vents and openings • detector and sprinkler activation times There is more extensive discussion of the output in chapter 6 of this technical reference manual and the users guide.