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Using .setSet to periodically spawn droplets/spheres

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Old   September 23, 2019, 05:48
Default Using .setSet to periodically spawn droplets/spheres
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F. Lang
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Hello,

I want to periodically generate droplets, with an initial velocity, inside a wind tunnel and calculate the resulting velocity field.

To achieve this I tried to alter the injection-tutorial by using setSet to define a spherical cellZone, which I set as target for the selectionMode inside the fvOptions.

c0.setSet
Code:
 cellSet c0 new
topoSetDict
Code:
 actions
(
    {
        name    c0;
        type    cellSet;
        action  new;
        source  sphereToCell;
        sourceInfo
        {
            centre (0.075 0.2 0.05);
            radius 100e-4;
        }
    }
);
fvOptions
Code:
 injector1
{
    timeStart       0.1;
    duration        5;
    selectionMode   cellZone;
    cellZone        c0;  
}

options
 {
 ...
 }
How ever I cannot understand how .setSet and topoSetDict interact with each other leading to the following error message:

Code:
 --> FOAM FATAL ERROR: 
Cannot find cellZone c0
Valid cellZones are 0()

    From function void Foam::fv::cellSetOption::setCellSet()
    in file cellSetOption/cellSetOption.C at line 142.

FOAM exiting
I cannot find any documentation regarding this in the OpenFoam documentation.As the sole tutorial using .setSet I found the damBreakWithObstacle, but struggle to adapt the method off generating the cellZone to my case.

Is there any documentation or tutorial explaining the usage of .setSet?

Thanks in advance.
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Old   September 23, 2019, 08:44
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F. Lang
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Found my mistake: I created a cellSet and tried to reference it as cellZone. In order to assign a cellZone you have to extend the topoSetDict as follws:
Code:
 actions
 (
     {
         name    dropCellSet;
         type    cellSet;
         action  new;
         source  sphereToCell;
         sourceInfo
         {
             centre (0.075 0.2 0.05);
         radius 100e-4;
         }
     }
 
 
     {
         name    drop;
         type    cellZoneSet;
         action  new;
         source  setToCellZone;
         sourceInfo
         {
             set dropCellSet;
         }
     }
 );
However, I still do not understand how .setSet and topoSetDict interact. Is the .setSet-file just another way to achieve what topoSet does via a bash-script?
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