Blocking strategy for cylinders inside cylinder
 

Assalam o Alaikum

Sir what will be the blocking strategy for the geometry shown below,

Sir actually in every annular space there is a different fluid. now when i tried i got lost in the blocks,,,,,,

first i tried to split the block from both ends and add them to a new as shown in figure and give it an arbitrary name and hide them to avoid the mess...

1 )Now sir i split the faces from both the ends and i tried to modify the ogrid now sir i want the inner block to get bigger and the outer block to get smaller but sir the opposite thing is happening why it so? and how i manage to do it correctly?


2 ) sir after dividing the inner block into multiple blocks by spliting faces at the end now how i can associates these blocks to my geomety i donot have any curve or vertex in this region and how to associate it?

geometry file and blocking file is attached, sir if you block this and explains it, it will help me alot; means a kind of a tutorial needed
Sir help needed

you need to make ogrid for each pipe + you need to split horizontally also

Jaza-KALLAH i will try . In-Sha-Allah try will be successful