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Problem with fvOptions dataEntry

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Old   March 27, 2014, 08:03
Default Problem with fvOptions dataEntry
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Pekka Pasanen
Join Date: Feb 2012
Location: Finland
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Hi, I'm trying to use table dataEntry in fvOptions file with MRFSource but it's not working. I'm trying to create a ramp function to increase omega with the following settings:

Code:
    MRFSourceCoeffs
    {
   nonRotatingPatches (rotor_inlet pipe_outlet rotor_outlet volute_inlet shroud_front shroud_back);
        origin      (0 0 0);
        axis        (0 1 0);
//        omega       -314.16;
        omega       table
        (
           (0 0)
           (200 -314.16)
           (12000 -314.16)
        );
    }
So omega should go from 0 -> -314.16 between iterations (I'm using simpleFoam) 0 -> 200 and then stay at the same value for the rest of the calculation.

This however is not working and I get an unphysical solution (viscous moment is in the direction of rotation). If I use the constant value from the beginning it's working, and if I go and manually change the dataentry from table to the constant value after iteration 200 the solution jumps and viscous moment changes to the correct value. So the table entry is clearly not producing a value of -314.16 for omega after iteration 200.

I suspect this is a bug, but I can't find a solution for it.
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Old   March 27, 2014, 08:08
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Pekka Pasanen
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Posts: 38
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Oh and related to this, I tried using timeActivatedFileUpdate function object as a quick fix to this to produce a step function for omega by changing the fvOptions file.

I can see the from the shell that the fvOptions file is updated correctly but the calculation is not picking up the change. So why is readifmodified not working if I use timeActivatedFileUpdate to change the file?
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