[ICEM] Grid independence test

Aladinos05 · February 27, 2018, 23:41

Hello there !

I wanted to get some info about a quick way by which i can generate different grid numbers for the same geometric model. Any quick hint ?!
I am trying to simulate the transient flow through a pump turbine, and i wanted to first do the grid independence test where i need to be testing different grid numbers ! the mesh that i have now has been generated through ICEM (it's a structured mesh).
Any intervention is highly appreciated ! Thank you

AtoHM · February 28, 2018, 03:28

I can't really speak for ICEM since I don't use it. But I think it is a lot of effort there from what I have seen.
ANSYS Turbogrid allows quickly changing the overall mesh resolution by a single parameter. For example you can specify some regional values and also a target overall mesh size, say 500.000 cells, 1.000.000 cells, and so on.

Far · February 28, 2018, 04:21

Quote:

Originally Posted by Aladinos05

Hello there !

I wanted to get some info about a quick way by which i can generate different grid numbers for the same geometric model. Any quick hint ?!
I am trying to simulate the transient flow through a pump turbine, and i wanted to first do the grid independence test where i need to be testing different grid numbers ! the mesh that i have now has been generated through ICEM (it's a structured mesh).
Any intervention is highly appreciated ! Thank you

increase each mesh by factor of 2. for example 1 million and next mesh should be around 2 million.

yanki · February 28, 2018, 04:23

Quote:

Originally Posted by Far

increase each mesh by factor of 2. for example 1 million and next mesh should be around 2 million.

Could you please let me know how to do this in ANSYS Meshing? Which parameter should I change?

shereez234 · March 2, 2018, 07:22

Quote:

Originally Posted by yanki

Could you please let me know how to do this in ANSYS Meshing? Which parameter should I change?

In ICEM it is in mesh parameters tab.

In ANSYS meshing I am not sure.

yanki · March 2, 2018, 07:33

Quote:

Originally Posted by shereez234

In ICEM it is in mesh parameters tab.

In ANSYS meshing I am not sure.

Thanks for the answer. I'll check it.

Far · March 2, 2018, 08:12

In ansys meshing you have to double the sizing to get half the no of nodes. And halving the mesh size will double the number of nodes.

yanki · March 2, 2018, 08:34

Quote:

Originally Posted by Far

In ansys meshing you have to double the sizing to get half the no of nodes. And halving the mesh size will double the number of nodes.

So let's say I have a mesh size of 1000000, and I want to double it without changing the geometry. I can do this with changing just one parameter in ANSYS Meshing?

Far · March 2, 2018, 09:21

Yes would be oversimplification. But that is the right direction you are picking up. Try it and see results.

February 27, 2018, 23:41	Grid independence test	#1
Aladinos05 New Member Binama Maxime Join Date: Mar 2015 Location: Harbin-China Posts: 9 Rep Power: 11	Hello there ! I wanted to get some info about a quick way by which i can generate different grid numbers for the same geometric model. Any quick hint ?! I am trying to simulate the transient flow through a pump turbine, and i wanted to first do the grid independence test where i need to be testing different grid numbers ! the mesh that i have now has been generated through ICEM (it's a structured mesh). Any intervention is highly appreciated ! Thank you

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February 28, 2018, 03:28		#2
AtoHM Senior Member M Join Date: Dec 2017 Posts: 642 Rep Power: 12	I can't really speak for ICEM since I don't use it. But I think it is a lot of effort there from what I have seen. ANSYS Turbogrid allows quickly changing the overall mesh resolution by a single parameter. For example you can specify some regional values and also a target overall mesh size, say 500.000 cells, 1.000.000 cells, and so on.

March 2, 2018, 08:12		#7
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	In ansys meshing you have to double the sizing to get half the no of nodes. And halving the mesh size will double the number of nodes.

March 2, 2018, 09:21		#9
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Yes would be oversimplification. But that is the right direction you are picking up. Try it and see results.