Change writeIntervall during simulation

Christian86 · February 8, 2017, 03:17

hi there,

i want to write out my fields in logarithmic timesteps. Since now, i´m restarting my simulation after a decade with an new writeIntervall.
Is there a possiblity to change the writeIntervall during the simulation?

Regards

Christian

jherb · February 9, 2017, 04:20

The system/controlDict file is read after each time step (if you set runTimeModifiable to yes). So you can change it during the simulation and it will use the new settings for the next time step.

Of course this is not automatic. So perhaps, you can write a shell/Python script, which continuously reads the log file and modifies the controlDict, if a certain time step has been reached.

Zbynek · February 10, 2017, 05:07

You can automate the procedure using timeActivatedFileUpdate utility. It allows you to specify a number of files (controlDict in your case) that are read at specified time steps. So if you will not have too many changes in the writeInterval, you can simply create a few controlDict versions and specify in timeActivatedFileUpdate file at which time they should be used.

Christian86 · February 10, 2017, 05:10

Thanks for your replys.

The solution by Zbynek seems to be very comfortable, so i´ll look for this one.

February 8, 2017, 03:17	Change writeIntervall during simulation	#1
Christian86 New Member Join Date: Apr 2014 Posts: 8 Rep Power: 12	hi there, i want to write out my fields in logarithmic timesteps. Since now, i´m restarting my simulation after a decade with an new writeIntervall. Is there a possiblity to change the writeIntervall during the simulation? Regards Christian

February 10, 2017, 05:07		#3
Zbynek Member Join Date: Jun 2016 Posts: 66 Rep Power: 10	You can automate the procedure using timeActivatedFileUpdate utility. It allows you to specify a number of files (controlDict in your case) that are read at specified time steps. So if you will not have too many changes in the writeInterval, you can simply create a few controlDict versions and specify in timeActivatedFileUpdate file at which time they should be used. Christian86 and dhblyy like this.

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February 9, 2017, 04:20		#2
jherb Senior Member Joachim Herb Join Date: Sep 2010 Posts: 650 Rep Power: 21	The system/controlDict file is read after each time step (if you set runTimeModifiable to yes). So you can change it during the simulation and it will use the new settings for the next time step. Of course this is not automatic. So perhaps, you can write a shell/Python script, which continuously reads the log file and modifies the controlDict, if a certain time step has been reached.

February 10, 2017, 05:10		#4
Christian86 New Member Join Date: Apr 2014 Posts: 8 Rep Power: 12	Thanks for your replys. The solution by Zbynek seems to be very comfortable, so i´ll look for this one.