[julien.decharentenay]

Hi,

I am having a slightly troubling problem. I am trying to update the simulation endTime in the controlDict during the simulation, but the updated controlDict file is not read...

solver: simpleFoam
openFoam: 2.2.1 (downloaded binaries)
Linux/ubuntu

I am running on amazon EC2, which I think may probably be the reason behind the issue.

I tried looking at the fileModificationChecking parameter as per http://www.openfoam.org/docs/user/co...plications.php. I could try timeStamp and timeStampMaster to no better effect, but could not try inotify (the binaries are not compiled with it).

Any idea?

Thanks in advance.
Julien

[wyldckat]

Hi Julien,

A few questions:

1. Is there any particular tutorial case from OpenFOAM, with which this can be reproduced?
2. Are you changing the end time well before the simulation ends?
3. Did you check if the dates of the files are actually changing?
4. Have you tried adjusting the parameter "fileModificationSkew" in the "etc/controlDict" file? Namely in this one: https://github.com/OpenFOAM/OpenFOAM...ontrolDict#L51

Best regards,
Bruno

[julien.decharentenay]

Thanks for replying.

Originally Posted by wyldckat

1. Is there any particular tutorial case from OpenFOAM, with which this can be reproduced?

I reproduced the problem with airFoil2D. Same behavior.

Originally Posted by wyldckat

1. Are you changing the end time well before the simulation ends?

Yes. There is plenty of time between the update to the controlDict and the simulation end - this being considered I was stopping the simulation manually (Ctrl-C) before the simulation end when I was seeing that the simulation should have stopped...

Originally Posted by wyldckat

1. Did you check if the dates of the files are actually changing?

I did check the date using "ls -l", which showed that the date of the file was changing. But I was not sure if there may not be a better utility.

Originally Posted by wyldckat

1. Have you tried adjusting the parameter "fileModificationSkew" in the "etc/controlDict" file? Namely in this one: https://github.com/OpenFOAM/OpenFOAM...ontrolDict#L51

I do not quite understand what the "fileModificationSkew" parameter does (or how it should be modified). The value was set to 30 and I changed it to 0 and it looks like the problem has been solved - at least for the airFoil2D case. I would need more testing to confirm for sure. Thanks a lot.

[wyldckat]

Hi Julien,

Originally Posted by julien.decharentenay

I do not quite understand what the "fileModificationSkew" parameter does (or how it should be modified). The value was set to 30 and I changed it to 0 and it looks like the problem has been solved - at least for the airFoil2D case. I would need more testing to confirm for sure. Thanks a lot.

I'm glad it worked... or at least I hope it will work for the real cases!

I thought about this possibility due to a very recent commit: https://github.com/OpenFOAM/OpenFOAM...70ffb4ac7429a3 - which has the comment:

ENH: codedFunctionObject: wait for NFS to load library

Looking at the modified source code, this is among the added details:

regIOobject::fileModificationSkew

Took me a bit to figure out where to look for this, but then I associated the notification details you had mentioned and had a look into the main "etc/controlDict"... hence the question/suggestion I made.

Best regards,
Bruno

[Hawxliquid]

Originally Posted by wyldckat

Hi Julien,

A few questions:

1. Is there any particular tutorial case from OpenFOAM, with which this can be reproduced?
2. Are you changing the end time well before the simulation ends?
3. Did you check if the dates of the files are actually changing?
4. Have you tried adjusting the parameter "fileModificationSkew" in the "etc/controlDict" file? Namely in this one: https://github.com/OpenFOAM/OpenFOAM...ontrolDict#L51

Best regards,
Bruno

Sorry for the deter of the post, but this just helped me a ton and wanted to post here in case someone has the same issue.
I was quickly modifying my controlDict file but the changes never were registered. It turns out setting the skew to 0 allowed that!



Thanks!