[TommyJ]

Hello,

I would like to compute the maximum of the u,v,z components of velocity with a functionObject.

I have been trying to use fieldMinMax as:

    fieldMinMax1
    {
        // Mandatory entries (unmodifiable)
        type        fieldMinMax;
        libs        (fieldFunctionObjects);

        // Mandatory entries (runtime modifiable)
        mode        component;
        fields      (U);

        // Optional entries (runtime modifiable)
        location    true;
    }

But so far I always get the same value for max and min at the same cell.

Does anyone know how to get the maximum/min of a component of a vectorField with a FO that will write the corresponding value to a log?

[Alczem]

Hey,


I can't say about monitoring specific components of the vector, but I recently used the minMax function and what worked for me was the following :

    {
        type                    fieldMinMax;
        //enabled                    true;
        libs                    ("libfieldFunctionObjects.so");
        writeControl            timeStep;
        //write                    true;
        //writeInterval           1;
        //writeToFile             yes;
        //log                     yes;
        location                yes;
        mode                    magnitude;
        fields                  (U p_rgh);
    }

The mode field seems relevant here. Hope it helps.


EDIT: I forgot to mention that the output was written in a .dat file in postProcessing/fieldMinMax/0

[TommyJ]

Hi,
Thanks for the reply, but the goal is to know where the maximum and minimum of each component is located. I am aware of the magnitude mode. I wounder if it would be possible to split the components with one functionObject and "feed" it to fieldMinMax.

[Alczem]

Hi,


Oh I see, well maybe you could use Paraview to output the values of each field and their components, and save this as a csv file. Then use Excel to sort the rows of your datasheet by the component value (that is what I would do if I needed to do it once or twice).



I did some reading to see if there was a way to access U's components directly through the fieldMinMax function (like U.component(0) or U.x) but no shot.


Sorry ! Maybe someone else can be more helpful

[TommyJ]

Originally Posted by TommyJ

Hi,
Thanks for the reply, but the goal is to know where the maximum and minimum of each component is located. I am aware of the magnitude mode. I wounder if it would be possible to split the components with one functionObject and "feed" it to fieldMinMax.

Apparently the last portion is possible :V... But I get all fields

    components1
    {
        // Mandatory entries (unmodifiable)
        type            components;
        libs            (fieldFunctionObjects);
        field           U;
    }


    fieldMinMax1
    {
        // Mandatory entries (unmodifiable)
        type        fieldMinMax;
        libs        (fieldFunctionObjects);

        // Mandatory entries (runtime modifiable)
        mode        magnitude;
        fields      (Ux);

        // Optional entries (runtime modifiable)
        location    true;
    }