| dasith0001 |
August 1, 2023 22:21 |
blockMesh - Curved surface - 3D - edge grading
1 Attachment(s)
Hi Foamers,
I am attempting to get to perfect mesh using blockMesh. my geometry has a curved channel, please see the figure.
So far the mesh is error free but checkMesh complains over high orthogonal cells. Theses cells are located along the y-axis, at the very edge of the curved channel ( along the curved line towards the end of top right).
I've tried edge grading to make those cells bigger as possible which seems to solve the problem but I am losing the smoothness of the curve.
I've attached the blockMesh file as well.
PHP Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: v2012 |
| \\ / A nd | Website: www.openfoam.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
scale 1;
upperLevel 0.1;
blockBx 10;
blockBz 100;
vertices
(
( 0.302195033 -0.039764330 0.053750000 ) // 0 A
( 0.321082223 -0.042249600 0.053750000 ) // 1
( 0.3324025 -0.032730084 0.053750000 ) // 2
( 0.303333079 -0.029867757 0.053750000 ) // 3
( 0.302195033 -0.039764330 $upperLevel ) // 4
( 0.321082223 -0.042249600 $upperLevel ) // 5
( 0.3324025 -0.032730084 $upperLevel ) // 6
( 0.303333079 -0.029867757 $upperLevel ) // 7
( 0.303333079 -0.029867757 0.053750000 ) // 8 B
( 0.332402500 -0.032730084 0.053750000 ) // 9
( 0.334010000 0.000000000 0.053750000 ) // 10
( 0.304800000 0.000000000 0.053750000 ) // 11
( 0.303333079 -0.029867757 $upperLevel ) // 12
( 0.332402500 -0.032730084 $upperLevel ) // 13
( 0.334010000 0.000000000 $upperLevel ) // 14
( 0.304800000 0.000000000 $upperLevel ) // 15
( 0.331155391 0.043575078 0.053750000 ) // 16 C
( 0.302195033 0.039764330 0.053750000 ) // 17
( 0.331155391 0.043575078 $upperLevel ) // 18
( 0.302195033 0.039764330 $upperLevel ) // 19
);
edges
(
arc 3 0 ( 0.302804490 -0.034820693 0.05375 ) // A
arc 2 1 ( 0.322635444 -0.0367596656 0.05375 ) //
arc 7 4 ( 0.302804490 -0.034820693 $upperLevel ) //
arc 6 5 ( 0.322635444 -0.0367596656 $upperLevel ) //
arc 11 8 ( 0.304433049 -0.014951879 0.05375 ) //
arc 10 9 ( 0.333607883 -0.016384768 0.05375 ) //
arc 15 12 ( 0.304433049 -0.014951879 $upperLevel ) //
arc 14 13 ( 0.333607883 -0.016384768 $upperLevel ) //
arc 17 11 ( 0.304148061 0.019924782 0.05375 ) //
arc 16 10 ( 0.333295584 0.02183424 0.05375 ) //
arc 19 15 ( 0.304148061 0.019924782 $upperLevel ) //
arc 18 14 ( 0.333295584 0.02183424 $upperLevel ) //
);
blocks
(
//hex (0 1 2 3 4 5 6 7) (20 20 100) edgeGrading (0.1 10 10 0.1 1 50 50 1 1 1 1 1) // - A
hex (0 1 2 3 4 5 6 7) (20 20 100) edgeGrading (1 10 10 1 1 50 50 1 1 1 1 1) // - A
hex (8 9 10 11 12 13 14 15) ($blockBx 20 $blockBz) simpleGrading (1 1 1) // (x y z) // 1 - B
hex (11 10 16 17 15 14 18 19) ($blockBx 30 $blockBz) simpleGrading (1 1 1) // (x y z) // 1 - C
);
boundary
(
front
{
type symmetry;
faces
(
(0 1 5 4)
);
}
back
{
type symmetry;
faces
(
(18 16 17 19)
);
}
minZ
{
type patch;
faces
(
(0 3 2 1)
(8 11 10 9)
(11 17 16 10)
);
}
maxZ
{
type patch;
faces
(
(4 5 6 7)
(12 13 14 15)
(15 14 18 19)
);
}
axis
{
type wall;
faces
(
(0 4 7 3)
(8 12 15 11)
(11 15 19 17)
);
}
maxY
{
type wall;
faces
(
);
}
interWall
{
type wall;
faces
(
(1 2 6 5)
);
}
masterA1
{
type wall;
faces
(
(2 3 7 6)
);
}
slaveB1
{
type wall;
faces
(
(9 8 12 13)
);
}
);
mergePatchPairs
(
(masterA1 slaveB1)
);
// ************************************************************************* //
What can I do to improve the mesh if I want to stick with blockMesh. ( which I really do).
Or do I have to say good buy to my good old friend (blockMesh) and turned into snappy ?
your thoughts on this highly appreciated.
Thank you
PS: my mesh could be fine as it is but I am always too sceptical about it. |
