# [ICEM] Grid independency study.

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 January 17, 2017, 12:35 Grid independency study. #1 New Member     Lovepreet Singh Join Date: Dec 2016 Location: Punjab, India Posts: 21 Rep Power: 3 Hello I have to study grid independency for my problem in Fluent. I have done meshing in ICEM CFD. Now how should I change the number of cells in ICEM CFD to get the grid independency effects. Thanks Sent from my C2004 using CFD Online Forum mobile app

January 17, 2017, 17:12
#2
Member

William
Join Date: Aug 2016
Posts: 56
Rep Power: 3
Quote:
 Originally Posted by lovegne Hello I have to study grid independency for my problem in Fluent. I have done meshing in ICEM CFD. Now how should I change the number of cells in ICEM CFD to get the grid independency effects. Thanks Sent from my C2004 using CFD Online Forum mobile app
The easiest way would be.
Blocking -> Pre-Mesh Params -> Refinement
Choose all blocks and increase the refinement level.

Then recompute the pre-mesh. I believe that number of nodes will double on for each level.

 January 18, 2017, 11:24 #3 New Member     Lovepreet Singh Join Date: Dec 2016 Location: Punjab, India Posts: 21 Rep Power: 3 With refinement of all blocks, number of nodes get increase to approx 4 times. what I want to increase by 1.5 times. Shall I choose important blocks only? Sent from my C2004 using CFD Online Forum mobile app

January 18, 2017, 15:19
#4
Member

William
Join Date: Aug 2016
Posts: 56
Rep Power: 3
Quote:
 Originally Posted by lovegne With refinement of all blocks, number of nodes get increase to approx 4 times. what I want to increase by 1.5 times. Shall I choose important blocks only? Sent from my C2004 using CFD Online Forum mobile app
If you have a single rectangle block with edges A, B, C and D. Where A & C and B & D are parallel. In that block the number of nodes is (Na*Nb) = (Nc*Nd)...
Na is number of nodes on edge A e.t.c.

So if
Na = Nc = 100
Nb = Nd = 100

The total number of nodes within the block is 100*100 = 10.000. If we double the nodes per edge we have nodes of 200*200 = 40.000 in the block.

So it depends on your blocking how much the number of nodes increase.

If you want to increase the number of nodes by only 1.5 you would have to change it manually. I would recommend using a replay file try multiplying the node number by ~1.225 to begin with...

 January 19, 2017, 03:07 #5 New Member     Lovepreet Singh Join Date: Dec 2016 Location: Punjab, India Posts: 21 Rep Power: 3 Thanks, I got it Sent from my C2004 using CFD Online Forum mobile app

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