Hi,
I have been trying to modify abaqus io to add subdomain names and boundary id 
names. The reader at present assigns subdomain ids based on a formula dependent 
on the abaqus elset as well as the element type. There are a couple of problems 
with this approach. 

1. ABAQUS elsets are not unique.. elements can belong to multiple elsets. 
However as far as I can see, 
libmesh elements can belong to only one subdomain.. being able to be part of 
multiple subdomains would be very useful though.. 

2. MeshBase only allows a unique subdomain name  - subdomain id mapping.. and 
giving subdomains ids depending on both elset name and element type makes this 
very hard to use the subdomain_name() function. I do not understand the 
original motivation for the implementation and I think a simpler scheme should 
not pose too many problems.

I have implemented code to enable the reader to handle generated element and 
node  sets (start, end , step)  as well as surfaces that are defined through 
element sets. 

Subramanya Sadasiva 

"But memory eventually fades. Turbulences damp out, internal strains yield to 
plastic flow, concentration inhomogeneities diffuse to uniformity. Systems tend 
to subside to very simple states,independent of their specific history."
Herbert Callen . Thermodynamics and an Introduction to Thermostatics.


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