Extract volume

Nadaaaa22 · November 4, 2018, 03:28

I’m new in Star-CCM+, I did a CAD and I imported it in the star-CCM+, it is a complicated geometry with a lot of cavities in irregular shapes how can I extract/subtract volume, I want to add fluid through these cavities but I don’t know what is the best way? Do I need to add a domain or there is another way?.

A similar shape to mine is attached.
Thank you

Maddin · November 4, 2018, 08:21

Can you show/explain a little bit more?

Most operations you can do on the surface level. Remeshing with protection of the geometry (feature lines!) supports you.

Nadaaaa22 · November 4, 2018, 14:54

My problem is somehow similar to the picture attached. I have the solid but I'm facing a problem how can I add the fluid?

Thank for your replay

me3840 · November 4, 2018, 14:59

If you have the solid body of that geometry then you just need to make a volume which encompasses it and do a boolean subtract.

Considering the complexity of that body I suggest doing this in a CAD package instead of STAR-CCM+.

Maddin · November 4, 2018, 17:58

I think to add a body around is possible with CCM to become a negative.
But I also think direct in CAD is faster.

pavko718 · November 5, 2018, 16:19

There are multiple ways to get the fluid volume. You can get it via subtraction in the original CAD package, as others have already mentioned. You can also do the same subtraction in STAR-CCM+, either at the CAD level (3D CAD) or using operations in the parts branch of the tree. This last method support CAD and surface level boolean operations. Lastly, you can use the Extract Volume operation in the parts branch to get the volume.

If your lettice does not contactact any other wall in your domain, you can simply make a box and combine it with your part, no extraction necessary. Then mesh this new part.

Nadaaaa22 · November 7, 2018, 14:57

Thank you all for your help.

Nadaaaa22 · November 7, 2018, 15:03

Sorry for this question what is the CAD package is it different from the 3-D CAD thank you.

me3840 · November 7, 2018, 17:46

"the CAD package" is whatever CAD software you are using (Catia, NX, Solidworks, etc). 3D-CAD is STAR-CCM+'s internal CAD software. It is pretty good for a CFD code, but it will struggle with anything really big or complex.

November 4, 2018, 08:21		#2
Maddin Senior Member Join Date: Mar 2009 Posts: 260 Rep Power: 18	Can you show/explain a little bit more? Most operations you can do on the surface level. Remeshing with protection of the geometry (feature lines!) supports you. Nadaaaa22 likes this.

November 4, 2018, 14:59		#4
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	If you have the solid body of that geometry then you just need to make a volume which encompasses it and do a boolean subtract. Considering the complexity of that body I suggest doing this in a CAD package instead of STAR-CCM+. Maddin and Nadaaaa22 like this.

November 4, 2018, 17:58		#5
Maddin Senior Member Join Date: Mar 2009 Posts: 260 Rep Power: 18	I think to add a body around is possible with CCM to become a negative. But I also think direct in CAD is faster. Nadaaaa22 likes this.

November 5, 2018, 16:19		#6
pavko718 New Member PK Join Date: Oct 2010 Posts: 9 Rep Power: 15	There are multiple ways to get the fluid volume. You can get it via subtraction in the original CAD package, as others have already mentioned. You can also do the same subtraction in STAR-CCM+, either at the CAD level (3D CAD) or using operations in the parts branch of the tree. This last method support CAD and surface level boolean operations. Lastly, you can use the Extract Volume operation in the parts branch to get the volume. If your lettice does not contactact any other wall in your domain, you can simply make a box and combine it with your part, no extraction necessary. Then mesh this new part. Nadaaaa22 likes this.

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November 7, 2018, 14:57		#7
Nadaaaa22 Member Join Date: Nov 2018 Posts: 41 Rep Power: 7	Thank you all for your help.

November 7, 2018, 15:03		#8
Nadaaaa22 Member Join Date: Nov 2018 Posts: 41 Rep Power: 7	Sorry for this question what is the CAD package is it different from the 3-D CAD thank you.

November 7, 2018, 17:46		#9
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	"the CAD package" is whatever CAD software you are using (Catia, NX, Solidworks, etc). 3D-CAD is STAR-CCM+'s internal CAD software. It is pretty good for a CFD code, but it will struggle with anything really big or complex.