Set correctly a muti-level adaptive refinement method

[cesarj.95plus]

Dear support,

I am practicing with the adaptive mesh refinement over a simple 2D cylinder configuration. I would like to set the following refinement layers:

• lvl 0 refinement for cells with vorticity-mag< 0.1
• lvl 1 refinement for cells with 0.1<=vorticity-mag < 0.25
• lvl 2 refinement for cells with 0.25<=vorticity-mag < 2.0
• lvl 3 refinement for cells with 2.0<=vorticity-mag

I have created for this reasons 6 cell registers

• lvl_1_ref that marks the cells for refinement where vorticity-mag > 0.1
• lvl_1_coa that marks the cells for coarseing where vorticity-mag < 0.09
• lvl_2_ref that marks the cells for refinement where vorticity-mag > 0.25
• lvl_2_coa that marks the cells for coarseing where vorticity-mag < 0.24
• lvl_3_ref that marks the cells for refinement where vorticity-mag > 2.0
• lvl_3_coa that marks the cells for coarseing where vorticity-mag < 1.95

So if we start from a base grid, regions where vorticity-mag > 2.0 will be afected by lvl_1_ref, lvl_2_ref and lvl_3_ref and therefore a grid refinement level 3 is achived. For regions where vorticity-mag > 0.1, only lvl_1_ref will be applied and a grid refinement level 1 is achieved.

However I see than only with the lvl_1_ref and lvl_1_coa refinement and coarsening criterias, the levels 3 of grid refinement are achieved. Is there any better way to apply each cell refinement level to a specific value of vorticity?