The Importance of the Compatible Combustion and Sub-grid Scale Models on the Simulation of Large-Scale Pool Fire

Document Type : Research Article

Authors

1 Faculty of Mechanical Engineering, Tarbiat Modares University

2 Assistant Professor, Faculty of Mechanical Engineering, Tarbiat Modares University

3 tarbiat modares university

Abstract

In this paper, large-scale pool fire behavior has been investigated with large eddy simulation. In order to investigate the efficiency of various combustion models in the pool fire simulation, two combustion models of the eddy dissipation model and infinite fast chemistry in two sub-grid scale models of Smagorinsky and one equation was evaluated. The infinite fast chemistry model has an over- prediction in the reaction rate and flame temperatures in the simulation of pool fire. In addition, the eddy dissipation model, due to the use of time characteristic of turbulence and diffusion, has more accurate results in the prediction temperature field and flow behaviors. The eddy dissipation model with one- equation sub-grid scale model has better prediction for the velocity field and there is a difference of about 5–10 % with the experimental measurements. However, the infinite fast chemistry combustion model can better fit with the Smagorinsky sub-grid scale than one equation sub-grid scale model in the simulation of pool fire. The numerical results predicted by the different combustion models and sub-grid models for vertical velocity along the central line are in the range of experimental results, and almost all models predict the vertical velocity in this line, good.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 52, Issue 9
December 2020
Pages 2425-2442

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