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Old   May 19, 2020, 03:38
Smile questions about interFoam
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jiaxin li
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Hi!
I'm new about OpenFoam.I followed the dambreak tutorial but had some confusions.

Now I know the file "setFieldsDict". It gives a nonuniform initial condition
about phase fraction.(air=0,water=1)
At the same time ,OpenFoam use "transportproperties"file give the nu and density of water and air(See below)
But what I don't understand is how OpenFoam choose properties in "transportproperties"file as the property of phase-0 or phase-1.Because I don't see a clear correspondence between the two files.In other words, why OpenFoam give the water property to phase-1 rather than phase-0.


thanks for your help.




defaultFieldValues
(
volScalarFieldValue alpha.water 0
);

regions
(
boxToCell
{
box (0 0 -1) (0.1461 0.292 1);
fieldValues
(
volScalarFieldValue alpha.water 1
);
}
);



phases (water air);

water
{
transportModel Newtonian;
nu 1e-06;
rho 1000;
}

air
{
transportModel Newtonian;
nu 1.48e-05;
rho 1;
}
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Old   May 20, 2020, 11:01
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You can think of alpha.water as a binary field -- if it is 1, it is water (and uses thermophysical properties for water) and if it is zero, it is air (and uses the corresponding properties). In between I'd guess it's a blend of the two, but I don't remember off the top of my head where that happens... probably wherever the thermo interFoam lives.

Caelan
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