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some questions of "alpha***" about the multiphaseInterFoam

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Old   March 27, 2013, 03:28
Default some questions of "alpha***" about the multiphaseInterFoam
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salame ama
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Hi, Foamers:
i run the tutorial of multiphaseInterFoam, met some questions about the dambreak4phase.
First: in the "alphaair" of "0" folder ,
...
boundaryField
{
leftWall
{
type alphaContactAngle;
thetaProperties
(
( water air ) 90 0 0 0
( oil air ) 90 0 0 0
( mercury air ) 90 0 0 0
( water oil ) 90 0 0 0
( water mercury ) 90 0 0 0
( oil mercury ) 90 0 0 0
);
value uniform 0;
....
what's the means of value? If means the percent of air, a part of leftwall contact air, why can it write the "value" of zero?

second: In the file <setFieldDict> of "system" folder,
...
regions
(
boxToCell
{
box ( 0 0 -1 ) ( 0.1461 0.292 1 );
fieldValues
(
volScalarFieldValue alphaWater 1
...
boxToCell
{
box ( 0 0 -1 ) ( 0.1461 0.1 1 );
fieldValues
(
volScalarFieldValue alphaWater 0
volScalarFieldValue alphaOil 0
volScalarFieldValue alphaMercury 1
...

in my eyes,a part of both water and Mercury are superposition, box (0 0 -1) (0.1461 0.1 1) . Can someone tell me why?
thanks in advance!
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Old   March 28, 2013, 02:51
Default still me
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salame ama
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Hi, still need your explaining.
From the multiphaseInterFoam: timestep error by simulating a co-extrusion nozzle,
he writed the "alphair" not like this:
internalField uniform 0;

boundaryField
{
leftWall
{
type alphaContactAngle;
thetaProperties
(
( water air ) 90 0 0 0
( oil air ) 90 0 0 0
( mercury air ) 90 0 0 0
( water oil ) 90 0 0 0
( water mercury ) 90 0 0 0
( oil mercury ) 90 0 0 0
);
value uniform 0;
}
......

why?
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