[FLASH-USERS] Refinement and Derefinement Criteria

[Seyit Hocuk]

Hi all,

First of all thanks Anshu. I have somthing to work on now. I also 
consider to switch to FLASH3.0. However, I have another question for 
anybody who can reply. Sorry that I ask many questions, but this should 
be a simple one.

Flash, as I believe, refines automatically when you don't put 
lrefine_max equal to lrefine_min. With witch criteria can I play with 
the refinement and how can I say when to derefine. Basically I don't 
completely understand how refinement works and the user guide is not 
completely transparant about this. I assumed that delta_ref, delta_deref 
and the reference_density were exactly these parameters. I initially 
thought that when the density "rho" (or whatever parameter is set for 
refinement) at each block exceeds the reference density by amount of 
delta_ref (multiplied or added?) then it refines and when it is lower by 
an amount of delta_deref it derefines. However, changing these 
parameters has proven to have little effect for me.

Can anybody explain me how this works and what the formula's are if any?

TY,
Seyit