×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Import voltages

Import voltages

Import voltages

(OP)
I'm trying to transfer voltages between two coupled thermal-electric analyses. Any suggestions?

I tried going the pre-defined field route but I can only import 'epot' as a field variable to modify material properties using USDFLD. So, not helpful.

I also can't use DISP to import voltages since I don't want it as a boundary condition but more as an initial value.

Any help is appreciated. Thanks!

RE: Import voltages

You can’t use initial conditions (predefined field for initial step) for this purpose because in coupled thermal-electrical analysis only steady-state electrical currents are considered. Import capability (Predefined Field —> Initial state) won’t work as well since it doesn’t support coupled thermal-electrical elements.

However there is another way to do it. You can define analytical (mapped) field to map electrical potential from previous analysis to next one. This capability is described in the „Creating mapped fields from output database mesh data”. To do it in this case you should follow these steps:
- open .odb file with results from first analysis, switch to EPOT at the last frame
- create second viewport, tile viewports vertically and in the new viewport open CAE model for second analysis, continue with this viewport selected
- create new boundary condition for the first step, select Electrical/Magnetic category and choose Electric potential, select whole model as a region, type magnitude of 1 and click the „Create Analytical Field” button
- choose Mapped field, select „ODB mesh” as Data source and select Viewport 1 (the one with .odb file from previous analysis opened) as Viewport to map, click Ok
- in the Edit Boundary Condition window change the Distribution to AnalyticalField-1 (the one just created)

RE: Import voltages

(OP)
Thanks for reply. But won't this apply a boundary condition i.e. the voltages at the selected nodes will remain fixed for the entire analysis? I want to define only the initial values of voltages at all nodes; the voltages should be able to be updated throughout the analysis.

Now that I think more about what you said, once I import voltages as bcs, I could create a second step (of the coupled thermal-electric kind as well). This way the bcs from first step would serve as initial conditions for the second step.

Do you think that this would work?

RE: Import voltages

Exactly, you can turn this boundary condition off in the second step. I'm afraid that it's the only way to do it since Abaqus doesn't support initial voltage in any form (due to the fact that it ignores transient current effects in thermal-electrical simulations, like I've mentioned before).

RE: Import voltages

(OP)
Yes, thank you.

Since I'm using input files to do all this, I'll have to resort to using DISP subroutine to prescribe voltages. Is there an easier way around the subroutine?

RE: Import voltages

Even when you've been working directly in the input file so far, you can still import such file to CAE (File --> Import --> Model and set filter to .inp files). Then make sure that everything was imported CAE correctly (some more advanced options tend to disappear when they are not supported in CAE) and use the procedure described above to create mapped field with voltage. But if you still don't want to use CAE then I think that you could read voltage from nodes in previous analysis, save it to text file and then apply it to nodes in new analysis.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

eBook - Rethink Your PLM
A lot has changed since the 90s. You don't surf the Web using dial-up anymore, so why are you still using a legacy PLM solution that's blocking your ability to innovate? To develop and launch products today, you need a flexible, cloud-based PLM, not a solution that's stuck in the past. Download Now
White Paper - Using Virtualization for IVI and AUTOSAR Consolidation on an ECU
Current approaches used to tackle the complexities of a vehicle’s electrical and electronics (E/E) architecture are both cost prohibitive and lacking in performance. Utilizing virtualization in automotive software architecture provides a better approach. This can be achieved by encapsulating different heterogeneous automotive platforms inside virtual machines running on the same hardware. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close