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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References
ASHRAE. (1997). Handbook of fundamentals—SI edition, American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., Atlanta.
Baum, H., McGrattan, K., and Rehm, R.(1997). “Three-dimensional simulations of fire plume dynamics.” J. Heat Transfer Society of Japan, 35, 455–52.
Blay, D., Mergui, S., and Niculae, C. (1992). “Confined turbulent mixed convection in the presence of a horizoneal buoyant wall jet.” HTD-Vol. 213: Fundamentals of Mixed Convection, ASME, New York, 65–72.
Chen, Q., Glicksman, L., and Srebric, J. (1998). “Simplified methodology to factor room air movement and the impact on thermal comfort into design of radiative, convective, and hybrid heating and cooling systems.” Final Rep. ASHRAE RP-927, American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., Atlanta.
Davidson, L., and Nielsen, P. (1996). “Large eddy simulation of the flow in a three-dimensional ventilated room.” Proc., Roomvent ’96, Vol. 2.
Deardorff, J.(1972). “Numerical Investigation of neutral and unstable planetary boundary layers.” J. Atmos. Sci., 29, 91–115.
Emmerich, S., and McGrattan, K.(1998). “Application of a large eddy simulation model to study room airflow.” ASHRAE Trans., 104(1B), 1128–1140.
Germano, M., Piomelli, U., Moin, P., and Cabot, W.(1991). “A dynamic subgrid-scale eddy viscosity model.” Phys. Fluids A, 3, 1760–1765.
Holman, J. (1989). Heat transfer, 5th Ed., McGraw-Hill, New York.
Incropera, F., and DeWitt, D. (1990). Fundamentals of heat and mass transfer, 3rd Ed., Wiley, New York.
Lilly, D.(1992). “A proposed modification of the Germano subgird-scale closure method.” Phys. Fluids A, 4, 633–635.
McGrattan, K., Rehm, R., and Baum, H.(1994). “Fire-driven flows in enclosures.” J. Comput. Phys., 110, 285–291.
McGrattan, K., Baum, H., Rehm, R., Hamins, A., and Forney, G. (2000). “Fire dynamics simulator, technical reference guide.” Technical Rep. NISTIR 6467, National Institute of Technology, Gaithersburg, Md.
Olson, D., Glicksman, L., and Ferm, H.(1990). “Steady-state natural convection in empty and partitioned enclosures at high rayleigh numbers.” Trans. ASME, 112(8).
Rehm, R., and Baum, H.(1978). “The equations of motion for thermally driven, buoyant flows.” Journal of Research of the NBS, 83, 297–308.
Restivo, A. (1979). Turbulent flow in ventilated rooms, Mechanical Engineering Dept., Univ. of London, London.
Smagorinsky, J. (1963). “General circulation experiments with primitive equations. I. The basic experiment.” Monthly Weather Review, 91, 99–164.
Xuand Chen. (1998). “Numerical simulation of air flow in a room with differentially heated vertical walls.” ASHRAE Trans., 104(1A), 168–175.
Yuan, X., Chen, Q., Glicksman, L. R., Hu, Y., and Yang, X.(1998). “Measurements and computations of room airflow with displacement ventilation.” ASHRAE Trans., 105(1), 340–352.
Zhang, W., and Chen, Q. (1999). “Large eddy simulation of natural convection flow in a room with a filtered dynamic subgrid scale model.” Proc., Int. Symposium on Computational Technologies for Fluid/Thermal/Structural/Chemical Systems with Industrial Applications, C. R. Klein and S. Kawano eds., August 1–5, Boston. PVP-Vol. 297-1, 263–268.
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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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