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-   -   [GAMBIT] Different of union, split, and subtract (http://www.cfd-online.com/Forums/ansys-meshing/130054-different-union-split-subtract.html)

Erlanda February 19, 2014 00:35

Different of union, split, and subtract
 
Excuse me,
Hello everybody, I need your help about drawing geometry.
Which one the better of union,split, or subtract to make one geometry which has two volumes or zones and connected each other ?
Thank you.

-mAx- February 19, 2014 02:32

it depends on your geometries
display them and tell how you want to mesh them

Erlanda February 19, 2014 03:01

https://www.facebook.com/photo.php?fbid=10200689615881072&set=a.13516785302 97.44192.1781414203&type=1&comment_id=2496227&offs et=0&total_comments=3&ref=notif¬if_t=photo_commenthttps://www.facebook.com/photo.php?f...1414203&type=1

I want mesh them with different mesh, but I want they are connected each other. Thank you

-mAx- February 19, 2014 03:52

no facebook access from office

Erlanda February 19, 2014 04:23

Iam sorry.
How to upload image without facebook link ?
Thank you.

-mAx- February 19, 2014 04:34

by clicking on "Go Advanced" you have more possibilities for editing (attachment for example)

Erlanda February 19, 2014 05:18

1 Attachment(s)
Attachment 28751

This is my geometry, thank you.

-mAx- February 19, 2014 05:23

Is volume 2 a solid or a fluid domain?

Erlanda February 19, 2014 05:27

volume 2 is a fluid domain.

-mAx- February 19, 2014 05:33

do you have someting between volume 1 and 2?
Is volume 2 included in volume 1?

Erlanda February 19, 2014 05:44

Yes, between volume 1 and volume 2, there is porous media.

-mAx- February 19, 2014 05:51

then you need a third volume for modeling this porous zone
your fluid flows through volume 1 , then porous, then volume 2

Erlanda February 19, 2014 06:19

oh, thank you.
Where is the position of third volume ?

-mAx- February 19, 2014 08:13

between both volumes, but that should you know (don't you have a cad sketch or whatever?)

Erlanda February 19, 2014 21:18

Ok, thank you
Which one the better of union,split, or subtract when I finished three volume to connected them ?

-mAx- February 20, 2014 01:33

if "contact" surfaces match them together you only have to connect faces. It means Gambit will connect "contact" face from volume 1 with "contact" face from volume 2 and will merge both surfaces. Finally you will have a common face betwenn volume 1 and volume 2.
But it will only work if both contact surfaces are exactly the same.
Did you build the geometry in Gambit or from cad package?

Erlanda February 20, 2014 04:45

Yes, I build the geometry in Gambit.
I hope it works.

-mAx- February 20, 2014 07:12

did you build your geometry from a paper? if yes, can you display it?

Erlanda February 20, 2014 08:02

1 Attachment(s)
Yes, I will display it.

-mAx- February 20, 2014 09:11

has your porous zone 0-thickness?


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