[ICEM] Improve Quality of Tetra Mesh

geod · December 10, 2014, 12:03

Hi all,

I've created myself an unstructured mesh using tetra/mixed type. Now I'm trying to improve the quality of the mesh. I managed to increase the quality by about 0.1 by smoothing globally, however the quality is still pretty poor.

Now I'm trying to find a way to improve further, but am struggling quite a bit. Could anyone suggest any ways I could go about doing this?

Here are a couple photos of the mesh:

Qualitymesh.jpg qualitymesh2.jpg

Help would be much appreciated!

diamondx · December 10, 2014, 12:17

refine a little bit more ... depending on what you are simulating

geod · December 10, 2014, 12:22

Can you recommend how to go about refining it more? I have just improved by another 0.05 by increasing the density of mesh and smoothing again.

geod · December 10, 2014, 12:23

I am simulating heat transfer between hot water pipe (inner pipe) and cold water pipe (outer pipe)

geod · December 11, 2014, 05:54

From the tutorials I have access to none of them actually explain unstructured mesh refinement. I know I must use the edit mesh section but what tools to use I do not know. I have tried playing around with different things for hours but cannot find the correct way.

Please could someone help!

diamondx · December 11, 2014, 09:53

Just decrease the size. local refinement are done by using the density option.

geod · December 12, 2014, 08:45

Excuse my amateurness, but I have tried decreasing maximum size of all the parts and changing density but the quality seems to remain the same.

When you say 'just decrease the size', please could you explain what area to decrease?

diamondx · December 12, 2014, 09:52

If you decrease the size and nothing change, it means the size element is still big. You should take a look at the scaling of your geometry. Use the ruler and measure the distance between two points. then you will decide based on that distance. When I say decrease the size, it's in the global mesh paramaters. make sure you click on apply and then go too compute mesh. this is explained in the tutorials. You should start by the tutorials.

rolloblues · December 12, 2014, 10:14

Hi geod,
I think you're quality is not so bad at all. The problem with your mesh is that it is extremely coarse.

another thing: if you are interested in thermal exchange between the tubes you'll need a prism layer of some sort on both the inner and the outer surface

December 10, 2014, 12:03	Improve Quality of Tetra Mesh	#1
geod New Member Join Date: Nov 2014 Posts: 22 Rep Power: 12	Hi all, I've created myself an unstructured mesh using tetra/mixed type. Now I'm trying to improve the quality of the mesh. I managed to increase the quality by about 0.1 by smoothing globally, however the quality is still pretty poor. Now I'm trying to find a way to improve further, but am struggling quite a bit. Could anyone suggest any ways I could go about doing this? Here are a couple photos of the mesh: Qualitymesh.jpg qualitymesh2.jpg Help would be much appreciated!

December 10, 2014, 12:17		#2
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	refine a little bit more ... depending on what you are simulating __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

December 11, 2014, 09:53		#6
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	Just decrease the size. local refinement are done by using the density option. __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

December 12, 2014, 09:52		#8
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	If you decrease the size and nothing change, it means the size element is still big. You should take a look at the scaling of your geometry. Use the ruler and measure the distance between two points. then you will decide based on that distance. When I say decrease the size, it's in the global mesh paramaters. make sure you click on apply and then go too compute mesh. this is explained in the tutorials. You should start by the tutorials. __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

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December 10, 2014, 12:22		#3
geod New Member Join Date: Nov 2014 Posts: 22 Rep Power: 12	Can you recommend how to go about refining it more? I have just improved by another 0.05 by increasing the density of mesh and smoothing again.

December 10, 2014, 12:23		#4
geod New Member Join Date: Nov 2014 Posts: 22 Rep Power: 12	I am simulating heat transfer between hot water pipe (inner pipe) and cold water pipe (outer pipe)

December 11, 2014, 05:54		#5
geod New Member Join Date: Nov 2014 Posts: 22 Rep Power: 12	From the tutorials I have access to none of them actually explain unstructured mesh refinement. I know I must use the edit mesh section but what tools to use I do not know. I have tried playing around with different things for hours but cannot find the correct way. Please could someone help!

December 12, 2014, 08:45		#7
geod New Member Join Date: Nov 2014 Posts: 22 Rep Power: 12	Excuse my amateurness, but I have tried decreasing maximum size of all the parts and changing density but the quality seems to remain the same. When you say 'just decrease the size', please could you explain what area to decrease?

December 12, 2014, 10:14		#9
rolloblues Member davide basso Join Date: Jan 2012 Posts: 48 Rep Power: 14	Hi geod, I think you're quality is not so bad at all. The problem with your mesh is that it is extremely coarse. another thing: if you are interested in thermal exchange between the tubes you'll need a prism layer of some sort on both the inner and the outer surface