- Author
-
McGrattan, K. B.
|
Rehm, R. G.
|
Baum, H. R.
- Title
- Fire-Driven Flows in Enclosures.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Journal
-
Journal of Computational Physics,
Vol. 110,
No. 2,
285-291,
February 1994
- Keywords
-
enclosures
|
equations
|
viscosity
|
thermal conductivity
|
vorticity
|
backdraft
|
gravity current
- Identifiers
- hydrodynamic model; Alternating Direction Implicit (ADI); time-dependent Navier-Stokes equations in the Boussinesq approximation
- Abstract
- A two-dimensional Boussinesq model describing heat-driven, buoyant convection in a polygonal enclosure is presented. The hydrodynamic model is based on the time-dependent Navier-Stokes equations with constant viscosity and thermal conductivity; no turbulence model or other empirical parameters are introduced. The polygonal domain is mapped via a numerical Schwarz-Christoffel transformation onto a rectangle, where the equations of motion are written in terms of the vorticity and stream function. An alternating direction implicit (ADI) difference scheme, second-order in space and first-order in time, is used to integrate the evolution equations, and a standard elliptic solver is used to solve the Poisson equation for the stream function. Computational results which are of interest to the fire research community are presented.