×
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

ANSYS LS-DYNA huge during time solution !!!

ANSYS LS-DYNA huge during time solution !!!

ANSYS LS-DYNA huge during time solution !!!

(OP)
Good afternoon,

 I have a trouble when I want to made a simulation using ANSYS LS-Dyna, because first of all my model implicate couple 200000 elements, which means 2 parts in contact and second part which must interact with first 2 part.

I made a surface to surface contact using automatic contact. After that I made an array table where I put time (0,1) and accereration of gravity (0,9.81). Other applied constrants are on nodes where the component is fixed. So, I used for output frequency 50 .

I have some doubt about during of solution, because tell me that my problem during couple 47 hours to resolve it. My system have a quad core i7 processor, 12 gb memory ram, and 2 harddisk in raid0, windows 7 64bit.

 I think somewere is some problem with the setting. But were? How I can reduce the time?

 I waiting your advice or opinion. Somebody can explain me?

 Best regards.  

RE: ANSYS LS-DYNA huge during time solution !!!

Gravity loads are not suited to explicit solutions. The time step will be tiny. You can try and mass scale parts wherever possible, but try ramping the gravity on over a small time period (e.g. 5ms) and holding it there to check that you only have small inertial oscillations in the response.


------------
See FAQ569-1083: Asking questions the smart way on Eng-Tips fora for details on how to make best use of Eng-Tips.com

RE: ANSYS LS-DYNA huge during time solution !!!

Also, check the stable time increment (check in the .otf file) as your mesh may also be giving you a very small time step.


------------
See FAQ569-1083: Asking questions the smart way on Eng-Tips fora for details on how to make best use of Eng-Tips.com

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!


Resources