Numerical simulation of buoyant convection in vented enclosures
The buoyant convection in a two-dimensional enclosure with openings is solved using a primitive variable explicit finite difference technique. A non-Boussinesq acoustically-filtered formulation is used which models inviscid buoyantly driven flows in a stratified environment. The numerical algorithm uses the flux-corrected transport (FCT) technique to resolve energy and vorticity fields, and the pressure field is determined using a direct method for solving nonseparable elliptic equations. The numerical algorithm requires that pressure and kinetic energy be combined into a ''total'' pressure field. A novel method is presented for treating inflow/outflow boundaries, where the direction of flow across the boundary is not known a priori. Demonstrative calculations are shown which simulate a fire environment in a vented room of planar geometry. The fire source is idealized as a distributed energy source. The calculations show the effect of venting on entrainment and induced flow.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6412117
- Report Number(s):
- SAND-86-0790; ON: DE87011574
- Country of Publication:
- United States
- Language:
- English
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640410 -- Fluid Physics-- General Fluid Dynamics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
99 GENERAL AND MISCELLANEOUS
990210 -- Supercomputers-- (1987-1989)
BOUNDARY CONDITIONS
CHEMICAL REACTIONS
COMBUSTION
COMPUTERIZED SIMULATION
COMPUTERS
CONVECTION
CRAY COMPUTERS
ENERGY TRANSFER
FINITE DIFFERENCE METHOD
FLOW MODELS
FLUID FLOW
HEAT TRANSFER
ITERATIVE METHODS
MASS TRANSFER
MATHEMATICAL MODELS
MATHEMATICS
NUMERICAL ANALYSIS
NUMERICAL SOLUTION
OPENINGS
OXIDATION
PRESSURE GRADIENTS
SIMULATION
THERMOCHEMICAL PROCESSES
TRANSPORT THEORY
TURBULENT FLOW
TWO-DIMENSIONAL CALCULATIONS