[rsa]

Hi everyone,

I am running a gas jet penetrating into a liquid bath. I set the boundary condition on inlet as fixedValue (uniform (0 0.1 0))for velocity (at 0/U) and ran my case for 5s. Now I have changed my inlet velocity to 0.25. the problem is I want to monitor the inflow/outflow rate. I know at the end of the simulation I can use patchIntegrate to calculate the flow rate at inlet/outlet but I am wondering if I can do that during the run inside the controlDict and write them into a file so that I can check it and plot it! I am not sure if there is any simillar post respect to this, I couldnt find it but if anyone knows I appreciate to give me a link or maybe explain how to do it.

tanx

[tomf]

Hi,

The faceSource functionObject can do the monitoring:

    
FlowRateInlet
{
    type                faceSource;
    functionObjectLibs ("libfieldFunctionObjects.so");
    enabled           true;
    outputControl   timeStep;
    log                  false;
    valueOutput     true;
    source            patch;
    sourceName   inlet;
    operation        sum;
    fields
    (
        phi
    );
        
    surfaceFormat   null;
}

This will write to a file postProcessing/FlowRateInlet/0/faceSource.dat If you use the foamMonitor script (requires gnuPlot) you can monitor the flowrate during the run.

Regards,
Tom

[rsa]

tanx Tom

now I can monitor my inflow-outflow while running. I am wondering if you can help me with one other thing. I want to monitor the pressure at certain coordinate. I have a experimental results and I want to save the pressure at a certain coordinate into a file. I am currently using the experimental results for validation of my model so I am wondering how I can save pressure at certain coordinate the same as the inflow-outflow.

appreciate your help.

/Reza

[tomf]

Hi Reza,

You can use the probes functionObject. Please have a look at this page:
OpenFOAM source guide

and click on post-processing for more functions like this. Many also have examples, will be a lot quicker than asking on the forum.

Regards,
Tom