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Simulation of gravity currents using the thermal lattice Boltzmann method. (English) Zbl 1329.76287

Summary: The lattice Boltzmann method (LBM) is an effective numerical technique of computational fluid dynamics. In this study, with some new thermal LBM schemes, the LBM is used to simulate the gravity current prior to backdraft (a particular and hazardous phenomenon in compartment fire) within laminar restrictions. The dimensionless time for gravity current traveling from the opening to the rear wall of a bench-scale compartment is calculated under different opening geometries, respectively, including: full end opening, upside-slot end opening, middle-slot end opening, downside-slot end opening, and slot ceiling opening. The application is very successful and the results show that the dimensionless time under the slot ceiling opening is the longest. Among the slot end openings, similar dimensionless time has been obtained for the upside-slot and middle-slot end openings, which is shorter than the downside-slot end opening. For the full end opening, the shortest dimensionless time is obtained. Finally, some valuable advices are given for fire protection engineering.

MSC:

76M28 Particle methods and lattice-gas methods
76V05 Reaction effects in flows
80A25 Combustion
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References:

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