Dense-gas dispersion advection-diffusion model

Conference · Wed Jul 01 00:00:00 EDT 1992

OSTI ID:7198260

Ermak, D L

A dense-gas version of the ADPIC particle-in-cell, advection- diffusion model was developed to simulate the atmospheric dispersion of denser-than-air releases. In developing the model, it was assumed that the dense-gas effects could be described in terms of the vertically-averaged thermodynamic properties and the local height of the cloud. The dense-gas effects were treated as a perturbation to the ambient thermodynamic properties (density and temperature), ground level heat flux, turbulence level (diffusivity), and windfield (gravity flow) within the local region of the dense-gas cloud. These perturbations were calculated from conservation of energy and conservation of momentum principles along with the ideal gas law equation of state for a mixture of gases. ADPIC, which is generally run in conjunction with a mass-conserving wind flow model to provide the advection field, contains all the dense-gas modifications within it. This feature provides the versatility of coupling the new dense-gas ADPIC with alternative wind flow models. The new dense-gas ADPIC has been used to simulate the atmospheric dispersion of ground-level, colder-than-ambient, denser-than-air releases and has compared favorably with the results of field-scale experiments.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7198260
• Report Number(s): UCRL-JC-109697; CONF-9208112-2; ON: DE92019617
• Resource Relation: Conference: 1992 JANNAF Safety and Environmental Subcommittee meeting, Monterey, CA (United States), 10-14 Aug 1992
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
ADVECTION
GASES
DIFFUSION
EXPANSION
HEATING
LIQUEFIED NATURAL GAS
MATHEMATICAL MODELS
THERMODYNAMIC PROPERTIES
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
LIQUEFIED GASES
MASS TRANSFER
NATURAL GAS
PHYSICAL PROPERTIES
POLLUTION
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)