how to use restart command in ansys Transient solution

[vinny31]

Hi

I am doing a very simple 2d transient dynamic analysis on a straight pipe full of water with one end as a moving wall.

I run the analysis for approx 6 seconds (with no errors) at which point I stop it end and I then examine my results sets.

After I have looked at my results I want to reset the moving wall back to its initial zero position but I want to restart the analysis to continue from the 6 second stage.

I having problems getting the analysis to do this restart, can anyone suggest anything?
Regards
V

 

[cbrn]

Hi,
what kind of problems do you exactly have? The list of the restart points doesn't come up? You can't help modifying the boundary conditions at the restart? You get some kind of warning or error? or what?

Regards

 

[vinny31]

There are no problems, no errors, basically I can’t get the analysis to restart and continue time stepping from the last time step.

The problem is 2d fluidic transient analysis using 141 element types. The 2d pipe has fluid in it, a paddle helps to move or push the fluid out the other end.

When the first transient analysis completes its run and finishes at 6 seconds the paddle is at maximum displacement and velocity. After analysing results I want to resume form that last time step. I reset the paddle back to a zero disp and vel by ramping it. I wish for the paddle to stay fixed for the remaining time but I want to monitor the motion of the fluid.



To date the first 6 second analysis runs fine no errors.
The resume and ramping of the analysis continues but it only carries out one time step and then that’s it.
No errors appear!!!. So basically that’s where I am getting this to continue.

 

[cbrn]

Hi,
when you perform a restart, the new analysis is completely independent from the previous, it only take the final substep of the previous (if you perform a single-frame restart), or the chosen restart step among the availables (if you perform a multi-frame restart), as the initial condition (which, in addition, can be modified and that's right what you are doing).
But it doesn't remember the analysis settings of the previous run: in your case, unless you re-specify the TIME and NSUBST, it will run with TIME = TIME(previous)+1 and NSUBST=1. If I understood it correctly, that is your problem.

I hope this helps...

Regards