One-dimensional numerical methods for the simulation of liquefied gaseous fuel spills
A simplified moving grid scheme has been developed and applied to a system of six partial differential equations (PDEs) which describe the dispersion of a dense natural gas cloud resulting from a spill of liquefied natural gas (LNG). The grid velocity at each point is determined by the physics represented by the governing PDEs. A grid velocity is sought which transforms the PDEs into a system of ordinary differential equations (ODEs) in a least-squares sense. No constraints were placed upon gradients. In the event of a zero gradient, singular matrix decomposition was applied. Likewise, no constraints were placed on grid velocity. Problems of grid tangling and/or violation of minimum point separation were handled by a regridding scheme. Results are presented using 21 grid points. Shock formation is well resolved. A comparable spatial resolution in a fixed-frame calculation would have required in excess of 500 grid points.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6916808
- Report Number(s):
- UCRL-87259; CONF-821106-18; ON: DE83002496
- Resource Relation:
- Conference: Annual meeting of heat transfer and energy conversion, Los Angeles, CA, USA, 14 Nov 1982
- Country of Publication:
- United States
- Language:
- English
Similar Records
Recent flame propagation experiments at LLNL within the Liquefied Gaseous Fuels Spill Safety Program
Behavior of LNG (liquefied natural gas) vapor clouds: tests to define the size, shape and structure of LNG vapor clouds. Interim report (annual) 1 June 79-30 June 80. [Spills]
Related Subjects
54 ENVIRONMENTAL SCIENCES
GAS SPILLS
MATHEMATICAL MODELS
LIQUEFIED NATURAL GAS
PARTIAL DIFFERENTIAL EQUATIONS
SIMULATION
SPATIAL DISTRIBUTION
TWO-PHASE FLOW
DIFFERENTIAL EQUATIONS
DISTRIBUTION
ENERGY SOURCES
EQUATIONS
FLUID FLOW
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
LIQUEFIED GASES
NATURAL GAS
030800* - Natural Gas- Environmental Aspects
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)