[adbuerger]

Hello everyone,

when doing non-steady simulations in STAR-CCM+, the autosaved files constantly increase in size, which sooner or later causes me memory issues. Is there a possibility to shrink the file size again? And in the first place, why are those files getting so big at all?

The first .sim-file was about 20 MB, now I'm getting more then 5 GB per autosaved file. I already saw that the residuals are stored for the whole simulation in each file, so I think that those are part of this effect. Is there anything else that causes this behavior? And: how can those things be cleared for at least some of my autosaves? If I knew what to so, I would probably use a macro to resolve my memory issues.

Any hint is highly appreciated! Thank you very much for your help!

[Eike]

Never got that issue. Is it .sim or .simh? simh-files can get very large of course.

[adbuerger]

Originally Posted by Eike

Never got that issue. Is it .sim or .simh? simh-files can get very large of course.

All of the files are .sim files.

[Eike]

Maybe you want to ask your DSE. I have no idea why a meshed 20MB sim-file get this size ...

[adbuerger]

Originally Posted by Eike

Maybe you want to ask your DSE. I have no idea why a meshed 20MB sim-file get this size ...

Thank you again for your answer, Eike! The only thing is, I do not understand what the abbreviation "DSE" stands for, can you explain?

[Eike]

DSE = Dedicated Support Engineer. Go to https://steve.cd-adapco.com/Site_Login Login and you will find his/her contact-data top left.

[LGMK]

Thought that this is connected to the size of your plots/monitors, which get more data to save over the simulation.

[me3840]

I am suspicious of your original sim file being 20MB. That sounds like a sim file which does not have a volume mesh. 5GB for a mesh and solution sounds pretty reasonable to me. How big is the mesh? What kind of simulation is it?

The sim file does not store any of the post-processed information, only the mesh, solution at current timestep, and settings. You can't reduce the size of the sim file other than reducing the size of your mesh. You can save transient data perhaps a little easier using the .simh file.

What data are you trying to save every timestep?

[Roman]

Could be several things. Here is a copy paste from an article on steve portal:

If you are using solution histories, having one or several solution histories that are loaded in your sim file increases its size. Another cause for large sim files in transient simulations could be a high number of field mean monitors used with the Sliding Sample Window option. The field is saved at each time-step for a number of times equal to the sliding samples. This in contrast to the mean calculated without a sample window, where only the running mean value is stored and amended according to the solution at the next time-step. Reduce the Sliding Sample Window size or the Iteration or Time-Step Frequency Start/Stop property to the minimum required.

If this does not describe a solution to your problem you should post more input and explain your setup.