transient thermal analysis error

[imse]

when i try to run a transient analysis for a thermal problem, i get the warning that reads:
"Present time 0 is less than or equal to the previous time in the transient analysis"
I click "proceed"
then i get the error that read:
"the step data was check and there were errors found"

could someone tell me what this error means?

I have noticed that if i do a steady state solution prior to transient, i dont get the error. Is it some kind if initialization error or am i just doing it wrong?

thanx in adv

Robin

 

[meshparts]

I suppose you didn't updated the time in each load step. See the command 'time'.

Regards,
Alex

 

[imse]

when i apply the time-time step for a load step... would the new load step continue from where the previous load step left off with or does it begin with from zero for the new load step?

eg.. if the first load step was to apply 450 degrees at node 1(end of time step is say 5sec, with step size 1sec)... and i apply the next load, say 500 degrees on node 7(for the same time duartion and step size), would the end of time step be 10sec with 1 sec time step size or end of time step be 5sec with 1 sec time step size?

thanx

Robin

 

[mgtrippledot]

hi,
every solve command needs the end time, so:

/solu
nsubst,"any","any","any"
time,5
.
.
.
solve

/solu
time,10
.
.
.
Solve


this will make the new end time and wont change your time step increments