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Simple question abt force output interval

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Old   October 8, 2020, 03:18
Default Simple question abt force output interval
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Hi,

I'm trying to ask a rather simple question on force output interval.

How can I tell OF that I want the force output file to write every 10 steps or 0.001 interval?

I use the motorBike tutorial as an example:

forceCoeffs1
{
type forceCoeffs;

libs (forces);

writeControl timeStep;
timeInterval 10;

log yes;

So I modify timeInterval to 10. But when I check, it still outputs every timestep.

So is there any solution? Or did I do something wrong?

Thanks!
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Old   October 8, 2020, 03:35
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Try writeInterval instead of timeInterval (see tutorials/multiphase/interFoam/RAS/DTCHull).
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Old   October 9, 2020, 00:33
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Hi Krapf,

I just changed the writeInterval to 10:

writeControl timeStep;
writeInterval 10;

but I'm still getting force output at every timestep:

602 (-1.658054e+01 1.597868e+03 3.869050e+03) (-3.151841e+00 1.598027e+03 3.869377e+03) (-1.342870e+01 -1.591310e-01 -3.273975e-01)
603 (-1.650899e+01 1.597155e+03 3.868442e+03) (-3.089344e+00 1.597315e+03 3.868768e+03) (-1.341965e+01 -1.600401e-01 -3.266844e-01)
604 (-1.640912e+01 1.597292e+03 3.868515e+03) (-2.998325e+00 1.597453e+03 3.868841e+03) (-1.341080e+01 -1.609618e-01 -3.262860e-01)
605 (-1.639075e+01 1.597377e+03 3.869334e+03) (-2.987208e+00 1.597539e+03 3.869660e+03) (-1.340354e+01 -1.617590e-01 -3.259897e-01)

Why is this so?
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Old   October 9, 2020, 03:03
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Hello quarkz,


What OpenFOAM version are you using?


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Old   October 9, 2020, 10:40
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Hi Yann,

I'm using v2006
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Old   October 9, 2020, 11:15
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Thanks! Maybe give a try to these parameters:

Code:
executeControl  timeStep;
executeInterval 10;

Here is what I have found for OpenFOAM-v2006:

Code:
type            forces;
libs            ("libforces.so");

// How often force and moment volume fields will be written
writeControl    writeTime; // none

// How often the forces force.dat and moment.dat data files are updated
// Note: .dat files are always updated on writeControl times
executeControl  timeStep;
executeInterval 1;

Let us know if it solves your problem!


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Old   October 12, 2020, 02:05
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Thanks Yann, I ran Allclean and Allrun again with:

executeControl timeStep;
executeInterval 10;

but it still output every time step. So what's wrong? Does it work?
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Old   October 12, 2020, 06:17
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Hi quarkz,

I use the forces function object quite often and I don't remember having this issue but unfortunately I do not have OpenFOAM-v2006 installed anywhere to test it.

I don't really know how to help. Maybe you can post your controlDict file, just in case someone can spot an error somewhere.

Yann

Last edited by Yann; October 30, 2020 at 03:09. Reason: Typo on the OpenFOAM version
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Old   October 30, 2020, 03:02
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Hi all,

I finally found the solution.

The keywords are:

For time:

executeControl adjustableRunTime;
executeInterval 0.001;
writeControl adjustableRunTime;
writeInterval 0.001;

For timesteps:

executeControl writeTime;
executeInterval 40;

writeControl timeStep;
writeInterval 40;

Btw, I'm using OF 2006.
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