Open AccessA coupled finite difference and material point method for simulation of gas–solid flow of thermobaric explosions
Author(s) -
Gen Li,
Fangyun Lu,
Zhibin Li
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/692/2/022091
Subject(s) - mechanics , container (type theory) , finite volume method , collision , flow (mathematics) , particle (ecology) , point (geometry) , two phase flow , finite difference , grid , point particle , gauge (firearms) , grid method multiplication , finite difference method , material point method , simulation , materials science , physics , classical mechanics , computer science , finite element method , mathematics , thermodynamics , geology , mathematical analysis , geometry , composite material , metallurgy , oceanography , computer security
A coupled finite difference and material point method (CFDMP) was presented to simulate the dynamic of the gas–solid flow of thermobaric explosions. The coupled method takes advantages of both the two methods where the finite difference method captures the wave structures of gas phase and the material point method tracks the movement of solid phase. Particle collision is easily realized in MPM framework. By using a uniform grid system, the grid nodes have both the two phases’ information and their interactions are directly calculated. The simulation of thermobaric explosions in different containers is carried out and the results validate the accuracy of CFDMP program. The particle collision reduce the compression degree of the solid phase in the initial expansion stage but slightly influence the pressure history at the gauge. The process of particle movement in the container is demonstrate and the wall-reflected wave enhances the burning rate of particles.