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Cyclic Boundary creation, what's the meaning of "separationVector"

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Old   June 1, 2010, 10:13
Default Cyclic Boundary creation, what's the meaning of "separationVector"
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Jiang
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Dear all.
I want to creat cyclic boundary using a pair of patches in lateral.
I want to do channel flow simulation, my wind comes from left.
So I think my cyclic boundary should be translational, not rotational.
But I don't know the meaning of separationVector , how should I set this vector when generating cyclic boundary . who can give me a explanation, Thanks.

patches
(
{
// Name of new patch
name CYCLIC;
// Type of new patch
dictionary
{
type cyclic;
transform translational;
separationVector (0 1 0);
}
constructFrom patches;
patches (CYCLIC_LEFT CYCLIC_RIGHT);
}
);
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