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Confused with wall boundaries in 3D

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Old   October 29, 2009, 12:37
Question Confused with wall boundaries in 3D
  #1
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Dennis Rown
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Hello!

I am modelling a cube with gas inside. Two sides of the cube have to be holes while the other four sides have to be walls. I have a patch for the holes and one for the walls.

In the blockMeshDict they're:

patch sides
(
(1 2 6 5)
(0 4 7 3)
)
wall walls
(
(0 1 5 4)
(5 6 7 4)
(3 7 6 2)
(0 3 2 1)
)

And in the 0/p they're:

boundaryField
{
sides
{
type zeroGradient;
}
walls
{
type zeroGradient;
}
}

Is this a false setting for walls to be walls and sides to be holes?
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Old   October 29, 2009, 14:23
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  #2
bhh
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Bjorn H. Hjertager
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Your wall BC seems OK. The holes are either inlets or outlets. If inlet zeroGradient is OK for pressure in addition you need a fixedValue for the normal velocity. If outlet the pressure should be a fixedValue.
rgds
Bjorn
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Old   October 30, 2009, 05:49
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Dennis Rown
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Thanks a lot! And for T is the same? And for U? I did it this way:

T)

boundaryField
{
outlet
{
type fixedValue;
value uniform 300;
}
walls
{
type zeroGradient;
}
}



U)

outlet
{
type fixedValue;
value uniform (0 0 0);
}
walls
{
type fixedValue;
value uniform (0 0 0);
}
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