[Geoqus] Wish lists for Abaqus

[Gabriele Morra]

Hi Susan,
  this is a great news. Indeed I have several improvements to propose. 
Perhaps we can make a list and send it to the Abaqus dealer of each 
country where we work. This would probably make pressure on them and 
raise the chances of having soon news.

1)  I have also written a code to couple with Abaqus but I also had 
this problem of not having access to all the variables. It would be 
really a great improvement to have the possibility to couple ABAQUS 
with an own code! Along this direction, if to expand GETVRM to all the 
subroutines is not possible, I would at least propose to have the 
possibility to run a subroutine at beginning of each increment with 
full access to all the variables in the model, of all the nodes and 
elements, and the possibility to modify fields, dloads, etc.

2) The possibility to implement shear stress within the *DLOAD call and 
not only as *CLOAD? A call to a subroutine for *CLOAD.

3) Remeshing in Abaqus Explicit produces a diffusion often too high for 
modeling many Earth systems (shear zones, ...). I would like to use my 
own remeshing algorithm in Explicit (if possible, also in Standard). It 
could be inserted also here a call to an external program at the 
beginning of each increment. In the external code I would have the 
possibility to modify the mesh and also the technique to trace the 
different material properties. (e.g. with active tracers or a 
semi-lagrangian advective routine).

4) I also would like to have heat generation due to plastic
and creep dissipation energy available for all
types of element, and all forms of plasticity

Cheers
Gabriele Morra
Geophysics Institute
ETH Zurich

> Hello everyone,
>
> My local Abaqus distributor in New Zealand just asked me
> to make up a 'wish list' for improvements to Abaqus.
> I'm appending my list below. I encourage you all to submit
> further suggestions to your local Abaqus dealers as well-
> that way, perhaps Abaqus will become more user-friendly in
> the future!
>
> sincerely
>
> Susan Ellis
> Institute of Geological and Nuclear Sciences
> New Zealand
>
> ***************************************************
> Wish-list for Abaqus improvements:
>
> 1. timestep displacement (cf. total displacement)
>    as an output option for contour plotting
>
>    - I know it is possible to construct this in the post-processor,
>      but it is so useful it should be there as a primary variable
>
> 2. User subroutines: to be able to access many more variables
>    from various subroutines than is possible at present
>
>    For example:
>
>    - to be able to access GETVRM from ALL user subroutines
>      Nodal subroutines would return quantities averaged onto the nodes
>      Elemental subroutines would return elemental values
>    - GETVRM to be expanded to give values at both:
>      -start of step
>      -start of increment
>    - Nodes of element (in elemental subroutine) to be available
>      and elements surrounding a given node to be available
>      (in nodal subroutines)
>    - the option of accessing the entire array outside of a step
>      (ie in between steps) so that a user function/program can
>      be called directly
>      e.g. suppose I want coupled stress/fluid flow/temperature
>      This is not possible in Abaqus
>      BUT I could run coupled stress/fluid flow, then compute
>      updated temperatures using my own finite element routine,
>      placed within a user subroutine that allows the entire
>      temperature array, plus fluid flow vectors, to be accessed
>
>      ..perhaps this option is already there, but documentation is
>      so confusing on this type of thing I haven't been able to
>      figure it out. All I can see at the moment is the possibility
>      to write it out as a nodal file, then run my program, then
>      read it back in, which is a bit cumbersome
>
> 3. Coupled temperature/fluid flow/stress computation would be
>    very useful..!
>
> 4. All geostatic options available for all elements
>    (eg axisymmetric with twist) and thoroughly tested
>
> 5. Prestress allowed, where forces to balance prestress are
>    not required (they are added automatically)
>
>    (e.g. this would allow an initial differential stress field to
>     be prescribed, and the user to then investigate force perturbations
>     from this "equilibrium" condition)
>
> 6. heat generation due to plastic and creep dissipation energy
>    available for all types of element, and all forms of plasticity
>    and creep
>
> 7. Permeability to depend on field variables as well as temperature
>
> 8. (In fact) all predefined fields to be allowed to depend on
>     field variables
>
> ..this would be a great start towards making Abaqus much more
> flexible for users
>
>
>
>
>
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