Blast Modeling with LS-DYNA

Engineering Air Blast Modeling - Video

First 23 minutes of 2 hour presentation - View Full Screen

Blast Class PDF Download

Abstract

Blast events form a class of simulation environments well suited to the solution capabilities of LS-DYNA. LS-DYNA is unique in offering the analyst the choice of Lagrange, Eulerian (MM-ALE) and Simple Engineering solvers, and combinations of these solvers, for simulating high energy events such as blast loading. In addition to air blast, the traditional focus of blast modeling, buried explosive charges have recently become important in the design of troop transportation.

This class focuses on the application of LS-DYNA for the simulation of high energy events. The analysis methods, and modeling, are illustrated through case studies. An emphasis is placed on modeling techniques: guidelines for which technique(s) to select, insights into which techniques work well and when, and possible pitfalls in modeling choice selections. Sufficient mathematical theory is presented for each technique, to provide the typical user with adequate knowledge to confidently apply the appropriate analysis technique. However, this training class is not a substitute for the in-depth treatments presented in the associated LS-DYNA training classes, i.e. Advanced ALE and ALE/Eulerian Fluid Structure Interaction.

Intended Audience

This training class is intended for the LS-DYNA analyst possessing a comfortable command of the LS-DYNA keywords and options associated with typical Lagrange analyses. The training class will attempt to provide the analyst with the additional tools and knowledge required to model the above described class of high energy events. The typical attendee is likely to have a background in defense applications, to include protective structures and vehicle vulnerability, homeland defense topics, and terrorist threat mitigation techniques. Because the class uses example problems to illustrate concepts and techniques, numerous modeling ‘tricks’ and options are discussed, and this knowledge would benefit any LS-DYNA user. Non-LS-DYNA users have taken this class and benefited as many explicit codes have similar capabilities.

Daily Class Schedule

Day 1

Opening Remarks (Len)
Equations-of-State (EOS) and Shocks (Paul)
Engineering Model (*LOAD_BLAST_ENHANCED) for Air Blast (Len)
Comparison of Engineering Models and MM-ALE for Air Blast (Len)

Day 2

LOAD_BLAST_ENHANCED Coupling with MM-ALE (Len)
Engineering Model (*INITIAL_IMPULSE_MINE) for Buried Charges (Len)
Vehicle Mine Blast Workshop (Paul)
OPTIONAL - Mach Stem Pressure Assessment (Len)
OPTIONAL - Vehicle Mine Blast Occupant Application (Paul)

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