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turbulentIntensityKineticEnergyInlet boundary condition

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Old   October 20, 2012, 16:04
Default turbulentIntensityKineticEnergyInlet boundary condition
  #1
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Sagnik
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Dear all, I wonder what "value uniform 1; // placeholder" / "value uniform 200; // placeholder" mean in "turbulentIntensityKineticEnergyInlet" / "turbulentMixingLengthDissipationRateInlet" boundary condition !

The k and epsilon values can be solved from intensity and mixing length only. What does "value uniform" do ?

Thanks for the input.

Sagnik


PS: Boundary condition specifications:

inlet
{
type turbulentIntensityKineticEnergyInlet;
intensity 0.05; // 5% turbulence
value uniform 1; // placeholder
}

inlet
{
type turbulentMixingLengthDissipationRateInlet;
mixingLength 0.005; // 5 mm
value uniform 200; // placeholder
}
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Old   October 20, 2012, 16:35
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Greetings Sagnik and welcome to the forum!

The need for the line with "value" is explained in the comment: it's merely a placeholder! In the sense that:
  1. The dictionary reading system requires that this line is present. You can try removing it and you'll see that the solver will complain about the missing entry.
  2. This "value" keyword is later used to store the fields that have been calculated in the next iterations!
Best regards,
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Old   October 21, 2012, 13:22
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Thanks a lot, Bruno .....
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Old   December 11, 2015, 19:36
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Shahabeddin
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Dear Friends

I faced with following error using "turbulentIntensityKineticEnergyInlet" BC:


Code:
--> FOAM FATAL IO ERROR: 
keyword value is undefined in dictionary "/home/shahabeddin/Desktop/elbow/0/k.boundaryField.velocity-inlet-6"

file: /home/shahabeddin/Desktop/elbow/0/k.boundaryField.velocity-inlet-6 from line 40 to line 42.

    From function dictionary::lookupEntry(const word&, bool, bool) const
    in file db/dictionary/dictionary.C at line 442.

FOAM exiting
and the definition is:
Code:
    velocity-inlet-6
    {
        type            turbulentIntensityKineticEnergyInlet;
        intensity       0.05        //5% turb inten
        value           uniform 0.0054;
    }
should I remove "value" keyword? or any other solution is exists?
I am using OpenFoam 3.0
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Old   December 12, 2015, 03:03
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Nima Samkhaniani
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you missed semicolone after intensity line

Quote:
intensity 0.05;
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