[snappyHexMesh] meshing

vishnunitro · February 20, 2014, 06:12

Hello,

Regarding multiphase flow,

I have 5 stl files, and one stl is a big geometry and other 4stl are very small. I am using snappyHexMeshmand i need a total mesh size of 50,000 cells.

but i can't able to reduce less than 100,000 cells..

please suggest me the ways to reduce the overall cell size..

Ruli · February 25, 2014, 15:03

dear vishnu,
what does "big" and "small" compared to the whole solution domain mean?

Possible ways:
- Reduce base blockMesh fineness (e.g. by using higher grading)
- Reduce domain size
- Reduce snappy max. fineness level

Keep in mind, less cells can lead to poorer accuracy.

Best regards
Julian

vishnunitro · March 5, 2014, 08:57

thankyou for your reply,,

for eg:

I have a big tank coneected with small pipes in a domain..
If i try to reduce the blockMesh fineness or using snappy i am not getting the complete mesh with all pipes and tank..

I mean the pipes are not getting meshed completely..my mesh is getting incomplete...

i have to get complete mesh but with minimum cells, now i dont want quality of mesh..

is there any idea

February 20, 2014, 06:12	meshing	#1
vishnunitro New Member vishnu Join Date: May 2013 Posts: 9 Rep Power: 13	Hello, Regarding multiphase flow, I have 5 stl files, and one stl is a big geometry and other 4stl are very small. I am using snappyHexMeshmand i need a total mesh size of 50,000 cells. but i can't able to reduce less than 100,000 cells.. please suggest me the ways to reduce the overall cell size..

February 25, 2014, 15:03		#2
Ruli Member Julian Langowski Join Date: May 2011 Location: Bremen, Germany Posts: 91 Rep Power: 15	dear vishnu, what does "big" and "small" compared to the whole solution domain mean? Possible ways: - Reduce base blockMesh fineness (e.g. by using higher grading) - Reduce domain size - Reduce snappy max. fineness level Keep in mind, less cells can lead to poorer accuracy. Best regards Julian __________________ πάντα ῥεῖ - Heraclitus

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March 5, 2014, 08:57		#3
vishnunitro New Member vishnu Join Date: May 2013 Posts: 9 Rep Power: 13	thankyou for your reply,, for eg: I have a big tank coneected with small pipes in a domain.. If i try to reduce the blockMesh fineness or using snappy i am not getting the complete mesh with all pipes and tank.. I mean the pipes are not getting meshed completely..my mesh is getting incomplete... i have to get complete mesh but with minimum cells, now i dont want quality of mesh.. is there any idea