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 dynamic 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.
ASME, AIChE, and ANS, 24th National Heat Transfer Conference and Exhibition
- Pub Date:
- Computerized Simulation;
- Differential Equations;
- Mathematical Models;
- Fluid Mechanics and Heat Transfer