×
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

LSREAD/LSWRITE problems

LSREAD/LSWRITE problems

LSREAD/LSWRITE problems

(OP)
I am using someone's input file that was written based on ANSYS 9.0.  I am trying to diagnose some error messages I am getting by using the input file on ANSYS 11.0.

It is basically an input file to perform non-linear (large deflection & material) analysis on an I-beam.  The file uses LSWRITE and LSREAD to write and read the load step data from step to step.

However, the characteristics of the analysis also requires use of the EKILL command and this is resulting in this error message at the beginning of each load step:

*** ERROR ***                           CP =    1529.734   TIME= 21:05:18
 LSWRITE/LSSOLVE cannot be used with the birth-death option              
 (EKILL/EALIVE).  Use the multiple SOLVE method instead.  


This doesn't make any sense to me.  Why would I not be able to use LSREAD/LSWRITE with the EKILL command?  Was this previously possible in version 9.0?

The analysis still appears to be working with the multiple SOLVE method, which I assume automatically writes and reads the data from load step to load step.  I am just confused as to why the error message occurs in the first place.

Any insight on this topic would be greatly appreciated.   

RE: LSREAD/LSWRITE problems

If your analysis has element birth and death, you can't use LSWRITE/LSSOLVE kind of load steps. Instead, separate your load steps by SOLVE command. Like:

load listing for load step 1
...
SOLVE
load listing for load step 2
...
SOLVE
load listing for load step 3
...
SOLVE
.
etc.


This will, however, be a continuous analysis (just like LSSOLVE), sice we are not putting FINI after each SOVLE command.

Regards,
Rahul Leslie

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