EVENT,EVENT84. Explosive Transients in Flow Networks
- Los Alamos National Lab., NM (United States)
EVENT was developed to investigate the effects of explosive transients through fluid-flow networks. Since in EVENT the effect of the explosion, not the characteristics of the explosion itself, is of interest, the transient is simulated in the simplest possible way. A rapid addition of mass and energy to the system at certain locations is used. This representation is adequate for all of the network except the region where the explosion actually occurs. The complexity of the problem requires a numerical solution. The governing equations are ordinary differential equations in time with pressure, density (nodes), and mass flow rate (branches) as the basic unknowns. The mass flow is expressed as the sum of an estimated value and two correction terms that are proportional to the variations of nodal pressure and density. The pressure and density variations are calculated from the mass and energy balances at each node, and the new nodal quantities are updated by summing the variations and the previous values. Convergence is reached when the variation is less than a given convergence factor. EVENT84 is a modification of EVENT which includes a new explosion chamber model subroutine based on the NOL BLAST program developed at the Naval Ordinance Laboratory, Silver Spring, Maryland. This subroutine calculates the confined explosion near-field parameters and supplies the time functions of energy and mass injection. Solid-phase or TNT-equivalent explosions (which simulate point source explosions in nuclear facilities) as well as explosions in gas-air mixtures can be simulated. The four types of explosions EVENT84 simulates are TNT, hydrogen in air, acetylene in air, and tributyl phosphate (TBP or red oil). Graphical output from EVENT and EVENT84 is provided by the EXPLOT and EVPLOT postprocessor programs, respectively. Both programs require the ISSCO proprietary DISSPLA graphics software system.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 139110
- Report Number(s):
- ESTSC-000317D0VAX00; NESC-9952
- Resource Relation:
- Other Information: PBD: 1 Nov 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
22 NUCLEAR REACTOR TECHNOLOGY
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
E CODES
VENTILATION SYSTEMS
AIR FLOW
COMPUTER PROGRAM DOCUMENTATION
EXPLOSIONS
MECHANICAL STRUCTURES
TRANSIENTS
SYSTEM FAILURE ANALYSIS
HAZARDOUS MATERIALS
ENVIRONMENTAL TRANSPORT
ACCIDENTS
COMPRESSIBLE FLOW
NUCLEAR FACILITIES
SAFETY
SYSTEMS ANALYSIS
THERMAL ANALYSIS