[lsb1292]

Hello,

boundaryField
{
#includeEtc "caseDicts/setConstraintTypes"

"(right|bottom)"
{
type zeroGradient;
}
left
{
type waveAlpha;
U U;
inletOutlet true;
}
top
{
type inletOutlet;
inletValue uniform 0;
value uniform 0;
}
}

Could please anyone explain what the physical meaning of zeroGradient is?

and what is alpha.water for exactly?

Thank you

[jpeter3]

zeroGradient boundary field assumes equal value at boundary as in first cell from boundary into the domain (special case of Neumann BC that imposes zero gradient of the field at boundary).

alpha.water is a phase field, an indicator funciton that tells you where phase water is in domain (0 - no water in cell, 1 - cell is full of water). It is defined as volume of water per volume of cell.

Cheers