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[GAMBIT] Meshing T-pipe

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Old   November 22, 2016, 16:46
Default Meshing T-pipe
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Hi everyone!

Is there any possibility how to mesh T-pipe only with cooper?

I want to mesh DN 700 pipe connected with DN 400 pipe in "T-shape"

Thanks!
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Old   November 23, 2016, 01:10
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This is not a T-Pipe, but you can get inspired from it
https://www.sharcnet.ca/Software/Gam...guide/tg03.htm
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Old   November 23, 2016, 03:49
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This is not a T-Pipe, but you can get inspired from it
https://www.sharcnet.ca/Software/Gam...guide/tg03.htm
Thank, but I have already download every possible tutorial guides (include this one), but have not found anything. Although this example is similar, it is still too different.
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Old   November 23, 2016, 04:07
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Ok,
Then make a volume decomposition like this:
Capture.JPG

Capture1.jpg

Be sure to start meshing the red volume
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Old   November 23, 2016, 05:01
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Ok,
Then make a volume decomposition like this:
Attachment 51945

Attachment 51946

Be sure to start meshing the red volume
Wow, thank you very much, that looks perfect. I have to admit that I am still begginer at Gambit, I mesh straight pipes with cooper, and T-pipe with tetrahedral.

Do you have a "step by step" guide of this?

Thanks alot for your advice!
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Old   November 23, 2016, 05:17
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Here is my journal file:
**************

volume create height 50 radius1 5 radius2 5 radius3 5 offset 0 0 25 zaxis frustum
volume create height 50 radius1 10 radius2 10 radius3 10 offset 0 25 0 yaxis frustum
volume move "volume.1" offset 0 25 0
volume unite volumes "volume.1" "volume.2"
face create width 100 height 100 yzplane rectangle
volume split "volume.1" faces "face.8" connected
volume delete "volume.2" lowertopology
face create width 100 height 100 yzplane rectangle
face move "face.13" offset -10 0 0
face move "face.13" offset 1 0 0
face move "face.13" offset 1 0 0
face move "face.13" offset 1 0 0
face move "face.13" offset 1 0 0
volume split "volume.1" faces "face.13" connected
face create width 100 height 100 zxplane rectangle
face move "face.19" offset 0 10 0
face move "face.19" offset 0 10 0
face move "face.19" offset 0 -1 0
face cmove "face.19" multiple 1 offset 0 10 0
volume split "volume.2" faces "face.19" connected keeptool
volume split "volume.1" faces "face.19" connected keeptool
face delete "face.19" lowertopology
face move "face.20" offset 0 1 0
face move "face.20" offset 0 1 0
volume split "volume.3" faces "face.20" connected keeptool
volume split "volume.4" faces "face.20" connected
face create width 100 height 100 xyplane rectangle
volume split "volume.3" faces "face.34" connected
face split "face.38" vertices "vertex.12" "vertex.13"
face create wireframe "edge.86" "edge.15" real
volume split "volume.7" faces "face.40" connected
volume mesh "volume.8" cooper source "face.40" "face.32" "face.34" size 1
undo
/Undone to: volume mesh "volume.8" cooper source "face.40" "face.32" "face.34" si
volume mesh "volume.8" cooper source "face.40" "face.32" "face.34" size 0.5
volume mesh "volume.3" cooper source "face.34" "face.22" size 1
volume mesh "volume.4" cooper source "face.20" "face.26" size 1
undo
/Undone to: volume mesh "volume.4" cooper source "face.20" "face.26" size 1
volume mesh "volume.4" cooper source "face.20" "face.26" size 0.5
volume mesh "volume.2" cooper source "face.15" "face.21" "face.37" size 1
volume mesh "volume.5" cooper source "face.10" "face.28" "face.35" size 1
volume mesh "volume.6" cooper source "face.20" "face.17" size 1
volume mesh "volume.1" cooper source "face.4" "face.26" size 1
volume mesh "volume.7" cooper source "face.3" "face.40" size 1
window modify invisible mesh
window modify shade
window modify noshade
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Old   November 23, 2016, 05:55
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Quote:
Originally Posted by -mAx- View Post
Here is my journal file:
**************

volume create height 50 radius1 5 radius2 5 radius3 5 offset 0 0 25 zaxis frustum
volume create height 50 radius1 10 radius2 10 radius3 10 offset 0 25 0 yaxis frustum
volume move "volume.1" offset 0 25 0
volume unite volumes "volume.1" "volume.2"
face create width 100 height 100 yzplane rectangle
volume split "volume.1" faces "face.8" connected
volume delete "volume.2" lowertopology
face create width 100 height 100 yzplane rectangle
face move "face.13" offset -10 0 0
face move "face.13" offset 1 0 0
face move "face.13" offset 1 0 0
face move "face.13" offset 1 0 0
face move "face.13" offset 1 0 0
volume split "volume.1" faces "face.13" connected
face create width 100 height 100 zxplane rectangle
face move "face.19" offset 0 10 0
face move "face.19" offset 0 10 0
face move "face.19" offset 0 -1 0
face cmove "face.19" multiple 1 offset 0 10 0
volume split "volume.2" faces "face.19" connected keeptool
volume split "volume.1" faces "face.19" connected keeptool
face delete "face.19" lowertopology
face move "face.20" offset 0 1 0
face move "face.20" offset 0 1 0
volume split "volume.3" faces "face.20" connected keeptool
volume split "volume.4" faces "face.20" connected
face create width 100 height 100 xyplane rectangle
volume split "volume.3" faces "face.34" connected
face split "face.38" vertices "vertex.12" "vertex.13"
face create wireframe "edge.86" "edge.15" real
volume split "volume.7" faces "face.40" connected
volume mesh "volume.8" cooper source "face.40" "face.32" "face.34" size 1
undo
/Undone to: volume mesh "volume.8" cooper source "face.40" "face.32" "face.34" si
volume mesh "volume.8" cooper source "face.40" "face.32" "face.34" size 0.5
volume mesh "volume.3" cooper source "face.34" "face.22" size 1
volume mesh "volume.4" cooper source "face.20" "face.26" size 1
undo
/Undone to: volume mesh "volume.4" cooper source "face.20" "face.26" size 1
volume mesh "volume.4" cooper source "face.20" "face.26" size 0.5
volume mesh "volume.2" cooper source "face.15" "face.21" "face.37" size 1
volume mesh "volume.5" cooper source "face.10" "face.28" "face.35" size 1
volume mesh "volume.6" cooper source "face.20" "face.17" size 1
volume mesh "volume.1" cooper source "face.4" "face.26" size 1
volume mesh "volume.7" cooper source "face.3" "face.40" size 1
window modify invisible mesh
window modify shade
window modify noshade
Wow, what a perfect job!

Even I know it will take me a century, I will try it !!

Cannot thank you enough
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Old   November 23, 2016, 05:59
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copy those lines in text editor and save it as text.
Then in Gambit you pick this file to run the journal:
File>Run Journal...
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Last edited by -mAx-; November 23, 2016 at 07:43.
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Old   November 23, 2016, 07:36
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Quote:
Originally Posted by -mAx- View Post
copy those lines in text editor and save it as text.
Then in Gambit you this file to run the journal:
File>Run Journal...
One more time thank you a lot ))

I work on this model of gas metering station with orifice flowmeters. I believe that you really help me ))


model.jpg
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Old   November 23, 2016, 08:05
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Quote:
Originally Posted by -mAx- View Post
copy those lines in text editor and save it as text.
Then in Gambit you pick this file to run the journal:
File>Run Journal...
Does it work in FLUENT (ANSYS 14.5)?
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Old   November 23, 2016, 08:08
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do you mean automation?
It was possible on Fluent 6.3
Now I don't know
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Old   November 23, 2016, 08:42
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Quote:
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do you mean automation?
It was possible on Fluent 6.3
Now I don't know
I dont know what does automation mean ? , thank you,
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Old   November 23, 2016, 08:45
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automatic tasks
(like a batch file)
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Old   November 23, 2016, 08:54
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Quote:
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automatic tasks
(like a batch file)
I dont know what batch file mean thank you again
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Old   November 23, 2016, 08:57
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open case 1
run case 1
write case and data for run1
open case 2
run case 2
write case and data for run2
open case 3
run case 3
write case and data for run3
...
the computer does all the tasks automatically
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Old   November 23, 2016, 09:00
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Thank you Max!
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Old   November 23, 2016, 16:46
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Quote:
Originally Posted by -mAx- View Post
copy those lines in text editor and save it as text.
Then in Gambit you pick this file to run the journal:
File>Run Journal...
Max, how did you create a volume 8, or face 40?

Because, if I run this journal in Gambit 2.2.30 it show me an error on this pic

model trial.jpg

I am almost done, but I do not know, how to split this last red volume ((

m?j model.JPG

Thanks a lot!
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Old   November 24, 2016, 01:04
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ok in your case I think you don't need to do another split.
You only have to enforce gambit to choose cooper scheme, and select source faces for cooper.
Here choose the 3 surfaces as I mentionned in the picture
Be also aware you need to mesh this volume first, and all other after:
you will project mesh from blue surfaces, on red one.
If red surface is already meshed, Gambit cannot project mesh on blue surfaces, because it has do generate a cut in the mesh
Capture.JPG
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Old   November 24, 2016, 14:27
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ok in your case I think you don't need to do another split.
You only have to enforce gambit to choose cooper scheme, and select source faces for cooper.
Here choose the 3 surfaces as I mentionned in the picture
Be also aware you need to mesh this volume first, and all other after:
you will project mesh from blue surfaces, on red one.
If red surface is already meshed, Gambit cannot project mesh on blue surfaces, because it has do generate a cut in the mesh
Attachment 51981
Thank a lot max ))

I almost done it, but couldnt mesh the last volume... I will do my whole project in tetrahedra and convert to polyhedra. Numerical time will be longer, but just thinkin, that I have to dothis for all T-pipes makes me cry

almost done.jpg
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Old   November 25, 2016, 01:33
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Then Apply Tet/Hexcore, it fill fill the domain with a max of hexa in the core of your volume.
But you will have to delete all the splits in the T-junction, else you will enforce the presence of tetraeders on the split surfaces
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