A two-mesh coupled gas flow–solid interaction model for 2D blast analysis in fractured media

A 2D coupled two-mesh interaction model for blast gas flow through fractured and fragmented solid media is presented. It is mainly designed to solve blast problems where a complicated set of wide difficult phenomena are involved: shock waves, progressive fracturing, gas–solid interactions, stability...

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Bibliographic Details
Published in:Finite elements in analysis and design Vol. 50; pp. 48 - 69
Main Authors: Mohammadi, S., Pooladi, A.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 01.03.2012
Elsevier
Subjects:
Applied sciences
Blast
Building structure
Buildings. Public works
Combined finite/discrete element method
Computational methods in fluid dynamics
Construction (buildings and works)
Contact
Cracking
Cracking (fracturing)
Exact sciences and technology
Explosion
Explosions
Flows through porous media
Fluid dynamics
Fracture mechanics
Fracture mechanics (crack, fatigue, damage...)
Fragmentation
Fundamental areas of phenomenology (including applications)
Gas flow
Gas–solid interaction
Masonry structure
Mathematical analysis
Mathematical models
Nonhomogeneous flows
Physics
Solid mechanics
Structural and continuum mechanics
Cracking
Combined finite/discrete element method
Explosion
Blast
Gas–solid interaction
Fragmentation
Fluid-structure interactions
Explosions
Masonry
Discrete element method
Crack propagation
Finite element method
Cracks
Shock waves
Porous medium flow
Blast wave
Gas-solid interaction
Gas solid
Modelling
Damage
Sliding friction
ISSN:0168-874X, 1872-6925
Online Access:Get full text
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Description
Summary:A 2D coupled two-mesh interaction model for blast gas flow through fractured and fragmented solid media is presented. It is mainly designed to solve blast problems where a complicated set of wide difficult phenomena are involved: shock waves, progressive fracturing, gas–solid interactions, stability of dynamic solution, contact mechanics, etc. The present approach is based on a gas flow through an equivalent porous medium and allows for temporal and spatial variations of mass, density, pressure and internal energy of the gas throughout the explosion process. The solid domain is represented by a combined finite/discrete element technique which is capable of modeling progressive cracking and fragmentation and any potential normal and frictional contacts during the cracking and post cracking phases. The approach allows for accurate evaluation of variations of geometries of voids and crack openings in order to facilitate the coupling effects on gas flow computations. A set of simple benchmark tests are used to verify the coupling and gas flow algorithms, while a rather complex engineering problem of progressive fracture of a masonry box due to an internal explosion is simulated to assess the overall performance of the proposed approach and to discuss various aspects of gas and solid phases in detail. ► Time independent- and dependent factors in a surgery are assessed together. ► Processes of solving Markov models are simplified with a modular approach. ► Continuous time Markov chains are adopted in evaluating surgery risk. ► Analytical results highlight the effects of rescue actions.
Bibliography:ObjectType-Article-2
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ISSN:0168-874X
1872-6925
DOI:10.1016/j.finel.2011.08.016