Evaluation of a Fast Large-Eddy-Simulation Model for Indoor Airflows
Publication: Journal of Architectural Engineering
Volume 8, Issue 1
Abstract
A three-dimensional large-eddy-simulation computational fluid dynamics (CFD) program, developed for studying the transport of smoke during a fire in an enclosure, is applied to four flow problems relevant to nonfire situations. This evaluation is relevant to the use of the program for indoor air quality modeling as well as its use in modeling the early phases of smoldering fires. The program uses finite-difference techniques to solve the Navier-Stokes equations, with an approach emphasizing high spatial resolution and efficient flow-solving techniques. Subgrid scale effects are addressed with the Smagorinsky model. The flow problems include simple geometries, with forced, natural, and mixed convection flows as well as a realistic test room with a displacement ventilation system and tracer gas release. Grid effects and computing time are investigated. Results are compared with the experimental data, and issues important to defining the problems in CFD are highlighted. In general the program predicts the experimental data reasonably well, with very fast computing times. However, care must be taken in defining convection from heated surfaces, and adequate grid resolution is needed to model the dispersion of a tracer gas in the enclosure.
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Published In
Journal of Architectural Engineering
Volume 8 • Issue 1 • March 2002
Pages: 10 - 18
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Feb 22, 2001
Accepted: Sep 12, 2001
Published online: Mar 1, 2002
Published in print: Mar 2002
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