[openfoammaofnepo]

Dear All,

I would like to make some quantities saved as a high frequency, e.g. 25 time step for each writing, while others 100 time step. This is because some quantities are more important in terms of unsteady variations.

I found that in openfoam, in the run-time post-processing

partialWrite:
allows registered objects, e.g. fields, to be written at different times (frequencies).

But I do not how set up in this calcualtions. Does anybody know how to perform that? do you have any other ideas about realizing this target?

Thank you very much.
OFFO

[olivierG]

Hello,

You should define this in your ControlDict file, at the end, like this:

functions
{
the_name_you_want
{
type partialWrite;
functionObjectLibs ("libIOFunctionObjects.so");
objectNames (p U T); // the fields you want to write here
writeInterval 25;// freq of write
}
}

regards,
olivier

[openfoammaofnepo]

Thank you.

I tried your suggestion in the tutorial in compressible/rhoPimpleFoam/les/pitzDaily

If write pressure as the in the following item:

objectNames (p);

The original in controlDict is 100, and the frequency for saving p is 50. Then I found that for all the time instants only contan p, all other variables are excluded. Did you have this problem? or I neglected something? Thanks.

[olivierG]

hello,

Yes this is the behaviour of partialWrite. It delete all entries except those selected.
If you wan U and T each 100 iterate, you may try to add another function obsject, like:
functions
{
func1
{
type partialWrite;
objectNames (p)
writeInterval 25;
}
func2
{
type partialWrite;
objectNames (p U T);
writeInterval 100;
}
}

NB: not tested.

regards,
olivier