[ufocfd]

how do you specify user defined variables in snappyHexMeshDict?

eg...
minLevel = 4
maxLevel = 6

then...
baseline
{
level ($minLevel $maxLevel);
}

[ufocfd]

its actually quite easy...

// levels are specified below in feature edge refinement,
// surface based refinement, and region based refinement.
minLev 4;
maxLev 6;

geometry
{
level ($minLev $maxLev);
}