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Old   July 22, 2011, 07:31
Default 3D pipe o-grid GAMBIT
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Hi,

i've try to make o-grid circular mesh on pipe 3-d. tried many times since yesterday didn't work.


now my idea, i make a face circle, and i have to split it into 8 pieces each @45°

how to split the circle face into 8 pieces faces @45°

how to do this on gambit ??

many thanks for help.
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Old   July 22, 2011, 07:50
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post a sketch of what you want
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Old   July 22, 2011, 07:52
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Quote:
Originally Posted by -mAx- View Post
post a sketch of what you want
thanks max.

here the pic

regards
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Old   July 22, 2011, 08:01
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on your picture you have a coax cylinder (one small cylinder hollow)
Sans titre.jpg
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Old   July 22, 2011, 08:13
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Quote:
Originally Posted by -mAx- View Post
on your picture you have a coax cylinder (one small cylinder hollow)
Attachment 8518
hi max,

yeahhh this is my problem.

i can make the one that in the middle hollow. i creat the mapped mesh on the outer face of cylinder, then submapped mesh on the face, circle ( inlet ) afterthat then i say to gambit should make the whole pipe (volume meshing) .. i've got as attached. it looks not good as in the hollow

should i just leave it hollow for the computation ? because it should a full cylinder.

attached the one i did now
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Old   July 22, 2011, 08:24
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Instead of a circle in the middle, create a square, then split the surface which surrounds the square into 4 sub-surfaces (see picture).
Mesh the square first, then the other.
Sans titre.jpg
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Old   July 22, 2011, 08:40
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Quote:
Originally Posted by -mAx- View Post
Instead of a circle in the middle, create a square, then split the surface which surrounds the square into 4 sub-surfaces (see picture).
Mesh the square first, then the other.
Attachment 8520

alright, how can i split the surface that surrounds the square into 4 sub-surfaces in gambit ?

thanks
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Old   July 22, 2011, 08:43
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create your vertex on the circle (with split edge for instance)
Then split surface with vertex: select one square corner and the appropriate vertex on the circle (it will split the surface with a line)
etc..
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Old   July 22, 2011, 09:32
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Quote:
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create your vertex on the circle (with split edge for instance)
Then split surface with vertex: select one square corner and the appropriate vertex on the circle (it will split the surface with a line)
etc..

thanks a lot max.

i've splitted the surface and the square as order.

now i try to mesh, if i starting from the surface square as map, then the surface circle ( see attached) gambit offer only pave option. i mean, if i switch to map mesh, it didn't work.

if i starting meshing from surface of the contour of the cylinder, then the the (inlet ) splitted surface (circle and square)
i got the mesh not as circular. see attached pic 2.

im sorry, im quite new with gambit.

thanks lot
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File Type: png Unbenannt2.png (35.0 KB, 73 views)
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Old   July 22, 2011, 09:41
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split also volumes:
split full pipe, with square-section-pipe
Then split volume surrounding the square-section-pipe with planes which will generate 4 sub-volumes.
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Old   July 22, 2011, 11:12
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Quote:
Originally Posted by -mAx- View Post
split also volumes:
split full pipe, with square-section-pipe
Then split volume surrounding the square-section-pipe with planes which will generate 4 sub-volumes.

thanks lot max.

but i got problem with splitting the volumen. it didint work. gambit said, it has a non volumen geometry. i try to comprehend.

i created 4 vertex alongside surface circle. then split surface with the square.

i found when i splitted the surface circle with the square with vertices ---> virtuell. (see attached) and the face change to non geometrical face. it means virtuelle surface ?? not real geometry

i dont know what i did wrong with splitting.
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Old   July 22, 2011, 14:23
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Hi Max...

finally i find the way!

well i get your idea to split the surface. but seems when i the circle edge splitted , seems the circle has got distorsion ,and the end of the vertex to another part of the surface didnt joint together.

now i didnt create the square in the middle. i just make the circle surface. then spitted into 4 quadrant.

when i click the mesh on the face, it marked a pizza slice orthogonal.

i've got not much experience, but i think the meshing now quiet good for computing. see attached.
what do you think ? is that enough to a good circular meshing for computing ?

thanks lot for helping.



finally i know how to split the surface. so now i made the version square with circle. (see attached) it also works.

many thanks Max!
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File Type: jpg Unbenannt2.jpg (94.5 KB, 58 views)
File Type: jpg Unbenannt.jpg (89.1 KB, 47 views)
File Type: jpg Unbenannt5.jpg (94.2 KB, 50 views)

Last edited by salzferkel; July 22, 2011 at 19:24.
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Old   July 24, 2011, 01:54
Default extrude in Gambit
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can any body tell me :
how can i extrude airfoil in Z dir by using GAMBIT?

tanx
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Old   July 25, 2011, 09:48
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Quote:
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can any body tell me :
how can i extrude airfoil in Z dir by using GAMBIT?

tanx
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sweep surfaces, and choose vector option
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Old   July 25, 2011, 09:51
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Quote:
Originally Posted by salzferkel View Post
what do you think ? is that enough to a good circular meshing for computing ?
There is no only one way to mesh a domain.
You can mesh with hexa, tetra, wedge, hybrid, coarse, fine, etc...
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Old   July 25, 2011, 10:19
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tanx max for your quick reply, i will try it ASAP, but would you tell me how can i see velocity or pressure contour for inside of the 3d geometry. on the othe hand i wanna eliminate or pale all bondaries to see what happen in it after run and see any contours. i dont want to use clip or slice or etc

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Old   July 25, 2011, 10:54
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if you don't want to use clip, sweep etc... then there are path lines.
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Old   July 25, 2011, 23:47
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how to get path line!!!?

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Old   July 26, 2011, 03:37
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Quote:
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how to get path line!!!?

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http://my.fit.edu/itresources/manual...tg/node357.htm
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Old   July 26, 2011, 04:15
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tanx but i use OpenFOAM software not Fluent, how did it in OpenFOAM??

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