Learning Forum

[rougiecorn]

Dear ANSYS Community,

I need to reproduce a cyclic loading experiment in ANSYS. I am solving a "static structural" analysis in ANSYS Workbench and ANSYS APDL. My model is two-dimensional with "plane strain" options. My material is non-linear (Voce+Chaboche). My analysis has many load steps (currently 50, but this number may increase).

My total amount of I/O written to disk and read from disk is of the order of 1000 GB. I managed to slightly reduce the amount by using OUTRES commands. I am using these commands to save only the stresses and strains in selected named selections (components).

Is there any way I could further decrease the amount of I/O? Using a coarser mesh or less load steps is not an option.

Kind regards,

rougiecorn

[Vigneswaran Sridharan]

Hi You can reduce the frequency with which data is written. For example, if you take a load step you will see multiple substeps (time points) are being solved. Instead writing the results at all time points you can only write the last time point of each load step. This will certainly save a lot of space. Remember the output controls are for each load step i.e. they can be different for different load steps. If you tried this one using the 'Freq' argument of the 'OUTRES' command, you are already on the right track in reducing the size.
So, Changing the nonlinear settings - Output control results from: "all-time points" to "last time point" and changing "restart controls, retain files" from "yes" to "no" should help you.
Reducing the port number and simplifying the model will reduce the problem size and reduce disk usage. But for a fixed problem, it still needs some disk space to write temp data during solving. So you need to make sure your disk space is large enough. The temp data under the Temp directory will be deleted automatically after simulation. If not, you can manually delete them after simulation, to free disk space.
Vigneswaran

[rougiecorn]

Hey Vigneswaran Thank you for your fast response. I tried to avoid reducing the write frequency, but this might be my only option.
I will continue to simplify my geometry and I'll try to minimize the load steps that I save.