[shipman]

Dear Foam users,

I would like to read the gravity values varying with time from a dataFile located in constant folder. As much as I searched, there is a close post here: http://www.cfd-online.com/Forums/ope...ty-time-2.html

In this post, iinterpolationTable<vector> is recommended which can be only used when the gravity values increase. However, I have random value depending on the time such as:
4
(
(0 (10 -5 0))
(0.1 (2 4 0))
(0.2 (-6 1.31 0))
(0.3 (21 0 0))
...
)

Is there anyone let me know how to read these gravity data varying with time.

Thank you in advance.

[Mehrez]

Hi
Try to use the swak4Foam toolkit.
Mehrez

[shipman]

Originally Posted by Mehrez

Hi
Try to use the swak4Foam toolkit.
Mehrez

Hi Mehrez,

Thank you very much for your reply. Actually, after looking at the interpolationTable code I found how to read the gravitation data from .dat file as follows:

interpolationTable<vector> Acc
(
    runTime.path()/runTime.caseConstant()/".dat"
);
  g.value()= Acc.(runTime.value());

If the .dat file is same with the time step (for example deltaT= 1)
4
(
(1 (1 5 4))
(2 (2 4 8))
...

above code works well. My another question is if my time step is 0.5 how can i make interpolation between these values given in .dat file.

Any advice will be appreciated.

Thank you

________
Moderator note: The following was also asked via PM:

Originally Posted by shipman

As an addition to above question, I used interFoam and I would like to get the water height vs time. Do you think that is it possible?

[wyldckat]

Quick answers @Baris: Sorry, I'm out of time for today and a bit grumpy/hungry, but nonetheless here goes:

1. You should have stated which OpenFOAM or foam-extend version you're using!
2. You should have provided code that I could test with, along with a test case
3. Instead of using the interpolation table, use "DataEntry": http://www.cfd-online.com/Forums/ope...tablefile.html

4. Originally Posted by shipman

   As an addition to above question, I used interFoam and I would like to get the water height vs time. Do you think that is it possible?

   Sorry, but the question is too vague I need a lot more details, context and what exactly you're trying to "get". Either way, it's probably possible, I guess
   • Because from your question, the only thing that comes to mind... er, that I can find on Google is this: http://www.cfd-online.com/Forums/ope...interfoam.html

[federicabi]

Originally Posted by shipman

Hi Mehrez,

Thank you very much for your reply. Actually, after looking at the interpolationTable code I found how to read the gravitation data from .dat file as follows:

interpolationTable<vector> Acc
(
    runTime.path()/runTime.caseConstant()/".dat"
);
  g.value()= Acc.(runTime.value());

If the .dat file is same with the time step (for example deltaT= 1)
4
(
(1 (1 5 4))
(2 (2 4 8))
...

above code works well. My another question is if my time step is 0.5 how can i make interpolation between these values given in .dat file.

Any advice will be appreciated.

Thank you

________
Moderator note: The following was also asked via PM:

Hi Baris, hi Foamers
do you know how to apply the interpolationTable code to read the forces.dat file, that is updated every timestep, in run time?

Thanks in advice.

Federica