- Author
-
Hoover, J. B.
|
Tatem, P. A.
- Title
- Application of CFAST to Shipboard Fire Modeling. Part 3. Guidelines for Users. Final Report. 1998-2000.
- Coporate
- Naval Research Laboratory, Washington, DC
- Sponsor
- Office of Naval Research, Arlington, VA
- Report
-
NRL/MR/6180-01-8550,
April 23, 2001,
104 p.
- Distribution
- AVAILABLE FROM National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161. Telephone: 1-800-553-6847 or 703-605-6000; Fax: 703-605-6900; Rush Service (Telephone Orders Only) 800-553-6847; Website: http://www.ntis.gov
- Keywords
-
shipboard fires
|
fire models
|
scenarios
|
specifications
|
CFAST
|
geometry
|
computer models
|
fire behavior
|
zone models
- Identifiers
- CFAST (Consolidated Fire growth And Smoke Transport); ship design
- Abstract
- There are two primary areas in which computer fire modeling could be of benefit to the US Navy. The requirements imposed by these applications are different and, in some ways, complementary. The first application, ship design, requires a capability for performing detailed simulations in a complex environment, but has few restrictions on the time required to obtain results. For the second area, real-time prediction of fire behavior, the model must be able to run faster than real time, but the predictions may be less detailed. These requirements approximately correspond to the capabilities of the two different cfasses of fire models: field models and zone models. Field models typically divide the region of interest (domain) into hundreds, thousands or even millions of small volumes (cells), the dimensions of which are typically on the order of centimeters or smaller. Temperature, pressure, species concentrations and other variables are calculated for each cell as a function of time and each variable is represented as a time variant scalar or vector field (hence the name field model). The results of these calculations can be very detailed, both in spatial resolution and in terms of ths amount of information available for each cell. However, field models are very slow --- it is not unusual to require hours of supercomputer time to simulate fractions of a second of real time even for physically small systems.