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Title: LLNL state-of-the-art codes for source calculations

Abstract

The explosion-source region is defined as the region surrounding an underground explosion that cannot be described by elastic or anelastic theory. This region extends typically to ranges on the order of 1 km/kt. For the simulation or analysis of seismic signals, what is required is the time resolved motion and stress state at the inelastic boundary. Various analytic approximations have been made for these boundary conditions, but since they rely on near-field empirical data they cannot be expected to reliably extrapolate to different explosion sites. More important, without some knowledge of the initial energy density and the characteristics of the medium immediately surrounding the explosion, these simplified models are unable to distinguish chemical from nuclear explosions, identify cavity decoupling, or account for such phenomena as anomalous dissipation via pore collapse. The purpose here is to document the state-of-the-art codes at LLNL involved in simulating underground (chemical and nuclear) explosions and, in so doing, present an overview of the physics. In what follows, the authors first describe the fundamental equations involved, discuss solution methods, coordinate frames and dimensionality. Then they identify the codes used at LLNL and their limitations. A companion report will describe the factors that most influence the seismicmore » response, i.e., the source properties important for discrimination. That report will emphasize the coupling between the rock properties and the characteristics of the explosion cavity.« less

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
86980
Report Number(s):
UCRL-ID-119734
ON: DE95014673; TRN: AHC29521%%36
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Feb 1995
Country of Publication:
United States
Language:
English
Subject:
99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; UNDERGROUND EXPLOSIONS; COMPUTER CODES; SEISMIC EFFECTS; DATA ANALYSIS; CHEMICAL EXPLOSIONS; NUCLEAR EXPLOSIONS; CALCULATION METHODS; A CODES; K CODES; D CODES; C CODES; COMPUTERIZED SIMULATION

Citation Formats

Glenn, L.A.. LLNL state-of-the-art codes for source calculations. United States: N. p., 1995. Web. doi:10.2172/86980.
Glenn, L.A.. LLNL state-of-the-art codes for source calculations. United States. doi:10.2172/86980.
Glenn, L.A.. Wed . "LLNL state-of-the-art codes for source calculations". United States. doi:10.2172/86980. https://www.osti.gov/servlets/purl/86980.
@article{osti_86980,
title = {LLNL state-of-the-art codes for source calculations},
author = {Glenn, L.A.},
abstractNote = {The explosion-source region is defined as the region surrounding an underground explosion that cannot be described by elastic or anelastic theory. This region extends typically to ranges on the order of 1 km/kt. For the simulation or analysis of seismic signals, what is required is the time resolved motion and stress state at the inelastic boundary. Various analytic approximations have been made for these boundary conditions, but since they rely on near-field empirical data they cannot be expected to reliably extrapolate to different explosion sites. More important, without some knowledge of the initial energy density and the characteristics of the medium immediately surrounding the explosion, these simplified models are unable to distinguish chemical from nuclear explosions, identify cavity decoupling, or account for such phenomena as anomalous dissipation via pore collapse. The purpose here is to document the state-of-the-art codes at LLNL involved in simulating underground (chemical and nuclear) explosions and, in so doing, present an overview of the physics. In what follows, the authors first describe the fundamental equations involved, discuss solution methods, coordinate frames and dimensionality. Then they identify the codes used at LLNL and their limitations. A companion report will describe the factors that most influence the seismic response, i.e., the source properties important for discrimination. That report will emphasize the coupling between the rock properties and the characteristics of the explosion cavity.},
doi = {10.2172/86980},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 1995},
month = {Wed Feb 01 00:00:00 EST 1995}
}

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