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initialising a thermal boundary layer at interface using funkySetFields

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Old   October 8, 2019, 13:34
Default initialising a thermal boundary layer at interface using funkySetFields
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Sam
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Hi all,

I am using interThermalPhaseChangeFoam to model a growing vapour bubble in a superheated liquid that can achieve results as shown in the following image.



Apologies for the enlarged image.

I have initialised the bubble using funkysetfields by using the following code.

initFieldAlpha
{
field alpha1;
expression "1";
keepPatches true;
}
initTemp
{
field T;
expression "378.15";
keepPatches true;
}
alpha1.org
{
field alpha1;
expression "0";
condition "pow(pos().x-0,2) + pow(pos().y-0,2) < pow((0.1E-3),2)";
keepPatches true;
}
BubbleTemp
{
field T;
expression "373.15";
condition "pow(pos().x-0,2) + pow(pos().y-0,2) < pow((0.1E-3),2)";
keepPatches true;
}


However, I am trying to initialise a thermal layer around the interface of the bubble by the equation as shown in the image using the equation.

δT = r(T = Tsat + 0.99(T∞ −Tsat)) −R0

where δT is initial thermal layer thickness (7.00 10−6)

R0 is initial bubble radius

It is suggested that the initial thermal boundary layer is to be misplaced about 1-2 cells outside the bubble interface on the liquid side.

I am unsure whether this can be achieved by funkysetfields or groovyBC or through codeStream.

Thanks for spending the time looking at my problem. If i need to provide you with more information please let me know.
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Old   October 25, 2019, 17:56
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Sam
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Hey guys,

Does anyone have any suggestions/guidance for this problem?

Last edited by saj216; October 26, 2019 at 17:26.
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Old   November 12, 2019, 18:04
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Sam
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Anyone have any ideas, getting a bit desperate here . My knowledge so far, suggests that I use groovyBC however I'm unsure how to define the thickness of the boundary.
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Tags
boundaries, bubble, code stream, funkysetfields, groovybc

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