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July 22, 2011, 07:31 |
3D pipe o-grid GAMBIT
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#1 |
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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. salzferkel |
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July 22, 2011, 07:50 |
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#2 |
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Maxime Perelli
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post a sketch of what you want
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July 22, 2011, 07:52 |
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#3 |
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July 22, 2011, 08:01 |
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#4 |
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Maxime Perelli
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on your picture you have a coax cylinder (one small cylinder hollow)
Sans titre.jpg
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July 22, 2011, 08:13 |
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#5 | |
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Quote:
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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July 22, 2011, 08:24 |
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#6 |
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Maxime Perelli
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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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July 22, 2011, 08:40 |
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#7 | |
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Quote:
alright, how can i split the surface that surrounds the square into 4 sub-surfaces in gambit ? thanks |
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July 22, 2011, 08:43 |
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#8 |
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Maxime Perelli
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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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July 22, 2011, 09:32 |
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#9 | |
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Quote:
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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July 22, 2011, 09:41 |
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#10 |
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Maxime Perelli
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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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July 22, 2011, 11:12 |
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#11 | |
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Quote:
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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July 22, 2011, 14:23 |
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#12 |
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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! Last edited by salzferkel; July 22, 2011 at 19:24. |
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July 24, 2011, 01:54 |
extrude in Gambit
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#13 |
Member
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can any body tell me :
how can i extrude airfoil in Z dir by using GAMBIT? tanx ___________ rasoul |
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July 25, 2011, 09:48 |
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#14 |
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Maxime Perelli
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sweep surfaces, and choose vector option
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July 25, 2011, 09:51 |
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#15 | |
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Maxime Perelli
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Quote:
You can mesh with hexa, tetra, wedge, hybrid, coarse, fine, etc...
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July 25, 2011, 10:19 |
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#16 |
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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
tanx ___________ Rasoul |
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July 25, 2011, 10:54 |
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#17 |
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Maxime Perelli
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if you don't want to use clip, sweep etc... then there are path lines.
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July 25, 2011, 23:47 |
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#18 |
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how to get path line!!!?
____________ Rasoul |
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July 26, 2011, 03:37 |
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#19 |
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Maxime Perelli
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July 26, 2011, 04:15 |
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#20 |
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tanx but i use OpenFOAM software not Fluent, how did it in OpenFOAM??
_______ Rasoul |
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