[lifeinhand]

Hi All,

I am running a transient case using LES on a computer server. The server in our school has a file number quota (limit) for each user. But when I use OpenFOAM in parallel, OpenFOAM will have a large number of files for each time step. (e.g. if I use 100 cores, OpenFOAM will have 100 folders, processor0, processor1...., in each folder contains multiple files, U, p, k....). The files limit the number of time step I can run/store at once.

Do you guys have any suggestions?

Any suggestion is appreciated!

[arvindpj]

You can use purgeWrite option in the controlDict file. Depending on the number, you could overwrite and save only the latest data.

 
purgeWrite      3;

or use post processing function objects like probe and sample data.

Cheers,


Edit:
If you need a more advanced solution check out the adiosWrite add-on to openfoam+.

[lifeinhand]

Thank you!

So far what I do is using sample method to sample a plane into a VTK file for prescribed time steps. And using Purge option only store solution for recent time steps.
The downside is I can only have the sample plane data for the whole run. I wish there is some sample method to extract certain 3D region into a VTK file.

PS: The adiosWrite slides was fascinating. I am thinking of using that.

[olesen]

Originally Posted by lifeinhand

PS: The adiosWrite slides was fascinating. I am thinking of using that.

If you are interested in using the adios writing, I would suggest using the latest updated version from the OpenFOAM community repository announced here:

http://openfoam.com/version-v1612+/c...ty-parallel-io

https://develop.openfoam.com/Communi...rite/README.md

It compiles smoothly with the 1612 release.
There is some background information as a http://openfoam.com/documentation/fi...ios-201610.pdf but is slightly out-of-date.

[lifeinhand]

Originally Posted by olesen

It compiles smoothly with the 1612 release.
There is some background information as a http://openfoam.com/documentation/fi...ios-201610.pdf but is slightly out-of-date.

The OpenFOAM versions on our Server are 4.0 / 3.0.1 / 3.0.0 / 2.4 .....
So the closest comparable version is 4.0 (I assume ) ?

[olesen]

Originally Posted by lifeinhand

The OpenFOAM versions on our Server are 4.0 / 3.0.1 / 3.0.0 / 2.4 .....
So the closest comparable version is 4.0 (I assume ) ?

These versions are unfortunately too old - you won't have any fun trying to get it working with them.
For what it is worth, with 1612 compiling OpenFOAM should be a much smoother experience.
But if you need some really easy to handle (eg, for your IT people), you might also take a look at the additional build script in the community repository. With this it is possible to provide a bundle of openfoam and third-party packages along with the configuration information (currently embedded as a table of information inside the script). It is not quite one-click, but getting much closer.

/mark

[lifeinhand]

Thank you, Mark!

I will try the 1612 Version on my computer and request our Supercomputing Staff add the newer version.

It seems our OpenFOAM version is following CFD Direct (openfoam.org) instead of ESI's OpenFOAM version.

[olesen]

Originally Posted by lifeinhand

Thank you, Mark!

I will try the 1612 Version on my computer and request our Supercomputing Staff add the newer version.

It seems our OpenFOAM version is following CFD Direct (openfoam.org) instead of ESI's OpenFOAM version.

Let me know how you get on. If there are specific issues/improvements for the adiosWrite, it would be nice if you used the gitlab tracker. This makes it easier to follow for the development process.