Direct simulations of outdoor blast wave propagation from source to receiver

Outdoor blast waves generated by impulsive sources are deeply affected by numerous physical conditions such as source shape or height of burst in the near field, as well as topography, ground nature, or atmospheric conditions at larger distances. Application of classical linear acoustic methods may...

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Bibliographic Details
Published in:Shock waves 2017-07, Vol.27 (4), p.593-614
Main Authors: Nguyen-Dinh, M., Lardjane, N., Duchenne, C., Gainville, O.
Format: Article
Language:English
Subjects:
Acoustics
Bursting
Computer simulation
Condensed Matter Physics
Construction costs
Detonation
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Estimates
Euler-Lagrange equation
Finite element method
Finite volume method
Fluid- and Aerodynamics
Heat and Mass Transfer
Mathematical analysis
Mathematical models
Nonlinearity
Original Article
Roughness
Sound
Terrain
Thermodynamics
Topography
Vegetation
Wave propagation
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Summary:Outdoor blast waves generated by impulsive sources are deeply affected by numerous physical conditions such as source shape or height of burst in the near field, as well as topography, ground nature, or atmospheric conditions at larger distances. Application of classical linear acoustic methods may result in poor estimates of peak overpressures at intermediate ranges in the presence of these conditions. Here, we show, for the first time, that converged direct fully nonlinear simulations can be produced at a reasonable CPU cost in two-dimensional axisymmetric geometry from source location to more than 500 m/kg 1 / 3 . The numerical procedure is based on a high-order finite-volume method with adaptive mesh refinement for solving the nonlinear Euler equations with a detonation model. It is applied to a real outdoor pyrotechnic site. A digital terrain model is built, micro-meteorological conditions are included through an effective sound speed, and a ground roughness model is proposed in order to account for the effects of vegetation and unresolved scales. Two-dimensional axisymmetric simulations are performed for several azimuths, and a comparison is made with experimental pressure signals recorded at scaled distances from 36 to 504 m/kg 1 / 3 . The relative importance of the main physical effects is discussed.
ISSN:0938-1287
1432-2153
DOI:10.1007/s00193-017-0711-2