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Problem creating mesh, quarter of cylinder

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Old   May 23, 2018, 09:09
Default Problem creating mesh, quarter of cylinder
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Carlos
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Hi all,

I have problems creating a mesh (quarter of a cylinder). I tried to follow the user guide and other posts, but I am getting some problems. Could you please have a look at it?

I have attached an image which the vertices that I am trying to construct.


/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: plus |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1;

vertices
(

(0 0 0)
(0 0 0.002)
(0 0 0.008)
(0 0.008 0)
(0 0.002 0)

(0.01 0 0.008)
(0.01 0 0.002)
(0.01 0 0)
(0.01 0.002 0)
(0.01 0.008 0)

);


blocks
(


hex (0 4 1 0 7 8 6 7) (20 20 1200) simpleGrading (1 1 1)
hex (4 3 2 1 8 9 5 6) (20 20 1200) simpleGrading (1 1 1)

);

edges
(
arc 1 4 (0.70710678 1 0.70710678)
arc 2 3 (0.70710678 1 0.70710678)
arc 6 8 (0.70710678 1 0.70710678)
arc 5 9 (0.70710678 1 0.70710678)

);


patches
(

patch front
(
(0 1 6 7)
(1 2 5 6)
)
patch back
(
(0 4 8 7)
(4 3 9 8)
)
patch upper_wall
(
(2 3 9 5)
)
patch inlet
(
(0 1 4 0)
)
patch left_wall
(
(1 2 3 4)
)
patch outlet
(
(7 6 8 7)
(6 5 9 8)
)

);



mergePatchPairs
(
);

thanks in advance
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File Type: pdf [Untitled].pdf (8.0 KB, 30 views)
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Old   May 23, 2018, 16:38
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Hi,

is your drawing correct? It is not a simple geometry if I get your stuff correct.
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Old   May 23, 2018, 16:59
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hello Tobi,

Thanks for getting back. The drawing is correct, two concentric cylinders, the vertices in the front are

0 1 4 for the smaller cylinder
0 2 3 for the bigger cylinder

the points for the back

7 6 8 for the smaller cylinder
7 5 9 for the bigger cylinder

Is it correct that I can do an arc between the vertices 5-9 and 2-3?

thanks in advance
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Old   May 23, 2018, 17:29
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I am sorry - I cannot get your picture with the points and how you want to build the blocks. It does not make sense to me - even if the drawing is correct.
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Old   May 24, 2018, 06:55
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Can you elaborate more on problem you want to solve? Do you want a baffle between those smaller and bigger cylinders?
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Old   February 16, 2022, 23:20
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hi carlos
I'm dealing with the same geometry (two concentric cylinders) and i want a quarter of it like you. I used fluent mesh generator for meshing because i didn't know that it's possible to generate this kind of geometry with blockMesh.
did you managed to solve your problem with blockMesh?
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Old   February 17, 2022, 06:51
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Quote:
Originally Posted by saeed sangchooly View Post
hi carlos
I'm dealing with the same geometry (two concentric cylinders) and i want a quarter of it like you. I used fluent mesh generator for meshing because i didn't know that it's possible to generate this kind of geometry with blockMesh.
did you managed to solve your problem with blockMesh?

I am not sure about this with blockMesh, but perhaps a better alternative than fluent meshing would be gmsh? Then you can use gmshToFoam?
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Old   February 17, 2022, 09:19
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I would advice using Salome.
Took me approximately 3min from start to finish.
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File Type: png 2022-02-17 14_18_54-SALOME 9.7.0 - [Study1].png (71.8 KB, 12 views)
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