grid study, important question

hamid1 · February 9, 2012, 11:44

Dear Friends

I have a very important question regarding the mesh study (grid independency study)

My simulation is based on mesh A in which the element size (done in ICEM) is 0.15 and the total number of elements is 1 934 000 mesh,
For grid study I decreased the size of element for two times (mesh B and C), every time it became smaller with the ratio of 15%,
So, for mesh B, the size of element is 0.1275 and the number of element is 3 048 000 mesh and
for mesh C, the size of element is 0.108375 and the number of element is 5 000 000 mesh,
then I investigated the critical parameter in the critical zone, (the difference between mesh C and A was 4%)

- My question is, whether my Grid study (independency) procedure is correct or not?
- I got a bit confused about the amount increase in elements or decrease in element size regarding to grid study as every source tell something different… is reducing the size every time by 15% OK?

Thank you very much for ur helps
Hamid

aeroAngel · August 4, 2013, 00:14

it depends on the system you have.
in a REAL Grid-study,number of elements should be like about 1,000,000 and 10,000,000 and 20,000,000 .
but for a normal user without any powerful system,you've done a good job.
and the results for the element range that you've used won't differ a lot, and i think you've got correct results

February 9, 2012, 11:44	grid study, important question	#1
hamid1 Senior Member hamid Join Date: Nov 2010 Posts: 185 Rep Power: 15	Dear Friends I have a very important question regarding the mesh study (grid independency study) My simulation is based on mesh A in which the element size (done in ICEM) is 0.15 and the total number of elements is 1 934 000 mesh, For grid study I decreased the size of element for two times (mesh B and C), every time it became smaller with the ratio of 15%, So, for mesh B, the size of element is 0.1275 and the number of element is 3 048 000 mesh and for mesh C, the size of element is 0.108375 and the number of element is 5 000 000 mesh, then I investigated the critical parameter in the critical zone, (the difference between mesh C and A was 4%) - My question is, whether my Grid study (independency) procedure is correct or not? - I got a bit confused about the amount increase in elements or decrease in element size regarding to grid study as every source tell something different… is reducing the size every time by 15% OK? Thank you very much for ur helps Hamid

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August 4, 2013, 00:14		#2
aeroAngel New Member Fateme Sh Join Date: Jul 2013 Location: Tehran Posts: 8 Rep Power: 12	it depends on the system you have. in a REAL Grid-study,number of elements should be like about 1,000,000 and 10,000,000 and 20,000,000 . but for a normal user without any powerful system,you've done a good job. and the results for the element range that you've used won't differ a lot, and i think you've got correct results