Progress in Numerical Simulation of Radioactive Fallout with Complex Conditions

doi:10.19596/j.cnki.1001-246x.8985

Abstract

Abstract:

The radioactive particles in the cloud of near-earth nuclear explosion diffuse and settle under the driving of wind at different heights, causing a wide range of radioactive contamination. Traditional fallout prediction models are based on ideal terrain and meteorological conditions, which can not solve the problem of prediction of radioactive contamination under complex conditions. This paper introduces the research progress of the authors' team on the numerical prediction of radioactive contamination under complex conditions in the past 10 years. Firstly, the numerical simulation method of atmospheric transport and settlement of radioactive particles is established based on the gas-solid two-phase flow model. Then the raindrop collision model and cascade downscaling technique are used to realize the prediction of radioactive contamination in rainfall weather and complex terrain conditions respectively. Finally, the numerical prediction ability of radioactive contamination under complex conditions is used to calculate the distribution law of contaminated radiation environment, and some significant results are obtained.

Key words: radioactive fallout, gas-solid two-phase flow, numerical simulation, wet deposition, complex terrains

Liuxing HUANG, Jun ZHUO, Yaqi LI, Shengli NIU, Yanjun FU, Xiazhi LI, Jinhui ZHU, Jinlin NIU. Progress in Numerical Simulation of Radioactive Fallout with Complex Conditions[J]. Chinese Journal of Computational Physics, 2024, 41(6): 797-803.

Figures/Tables 5

Fig.1 Sketch of Lagrangian-Lagrangian simulation approach

Fig.2 Simulated results and Exp. data of contamination (a) dose rate in hot line; (b) area of contamination

Fig.3 Distribution of radioactive particles with different diameters

Fig.4 Radioactive contamination distribution under different rainfall intensity (a) rainfall intensity of 1 mm ·h-1; (b) rainfall intensity of 10 mm ·h-1

Fig.5 Dose rate of radioactive contamination for 24 h after 50 kt ground nuclear explosion (a) considered terrain; (b) unconsidered terrain

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