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It is possible OpenFoam saves only the velocity field in every timestep?

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Old   January 14, 2021, 11:16
Default It is possible OpenFoam saves only the velocity field in every timestep?
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Aina
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Dear all, currently I'm doing a 3D simulation using kOmegaSST. I need to save in every timestep the velocity field instead of all variable fields (k, omega, p, nut, etc.). It is possible?
I can't see in controlDict any option to do this.

Thanks a lot!
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Old   January 14, 2021, 12:11
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I'm not sure how to do it without modifying the code (maybe someone can jump in here). But but to get you an answer this can be done by incorporating some small changes to e.g., pimpleFoam :

First, copy the solver and rename it to something like myPimpleFoam (make sure to update Make/files as well and have it compile to $FOAM_USER_APPBIN). Then, instead of

Code:
runTime.write()
in the run loop we can use something like

Code:
//see if it is time to write data
if (runTime.writeTime())
{
    //only write U
    U.write();
}
Caelan
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Old   January 15, 2021, 07:41
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It works exactly as you said

Thank you!
Aina
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Old   January 19, 2021, 12:44
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Federico Zabaleta
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Unless you want to make a cool video, I don't know why you would want to do that. If you need to postprocess every time-step it may be better to do it during the run-time and avoid saving lots of files that will occupy a lot of space in your hard-drive.
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