A CSD Finite Element Scheme For
Coupled Blast Simulations
Author(s)
O. Soto, J. Baum, R. L¨ohner, E. Mestreau & H. Luo
Abstract
An efficient explicit finite element scheme to deal with a class of coupled fluidsolid
problems is presented. The main ingredients of such a methodology are:
simple shell elements; an algorithm to deal with material failure and cracking
propagation; and a chunk rigidization methodology to avoid the possible numerical
instabilities that may be produced by pieces of material flying away from the
main solid body. The overall CSD scheme is coupled with a flow code by using an
embedded methodology. Two real cases are presented.
1 Introduction
In the analysis of complex structures subjected to blast loading and large deformations,
Lagrangian finite element codes with explicit time integration are a necessary
tool [7]. This class of problems requires hundred of thousands of time steps
and, in some cases, millions of shells (and/or solids), which forces the use of computationally
simple (cheap) elements. Furthermore, the material failure and the
possible changes of topology due to the crack advance has to be implemented
in an efficient manner. Expensive remeshing procedures and/or cracking schemes
could make the calculation of real problems an impossible task in terms of CPU
time. Moreover, the possible numerical instabilities that may appear as a result
of several chunk of elements flying away has to be taken into account. For most
cases, it is not necessary to compute in an accurate manner the internal stresses
of the small chunks, but their sizes and shapes (i.e. for bomb fragmentation studies).
Hence, a fast rigidization algorithm that maintains the volume of the chunks
Keywords
Related Book
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