[absrocks]

Hi, I am running an interfoam simulation in which I need to calculate UMean periodically. My required time period is 0.01s, within which Umean needs to be computed. Then in the next time period (0.01s interval), UMean will be calculated without considering UMean at the previous time period. I have achieved this with the following condition.

 U
        {
            mean         on;
	    prime2Mean   on;
            base         time;
        }
	
        );
        enabled         true;
    log             true;
    writeControl    outputTime;
    restartOnRestart    false;
    restartOnOutput     false;
    periodicRestart     true;
    restartPeriod       0.01;

However, I need to access the UMean for the previous time period to calculate UPrime. For example, if the run time is 0.012s, I need UMean at 0.01s (before reinitialization of UMean) and use that Umean to calculate UPrime for the next 0.01s. But I am not sure how do I access UMean in the previous time period.
The only solution I can think of saving the data at 0.01s interval (which will be costly in my case) so that I can access UMean from the latest output data, though I am not sure how do I access UMean from last written data.
Any help is appreciated!

[absrocks]

Hi any idea?

[jmt]

I don't have a solution but some thoughts. You could create a custom field in your solver that writes the previous UMean field (e.g., UMean_old or similar) to disk and uses that for the UPrime calculation.

Perhaps there's a way to overwrite the purgeWrite option for this custom field so that the simulation only saves the most recent field and deletes the previous ones?

[absrocks]

Thanks, Julian for your suggestion, I finally managed to implement that in solver. I mainly looked at the fieldAverage.C and created two fields, one will store the old Umean and the other field will calculate the current Umean.