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[blockMesh] making mesh with 6 vertices to a horizontal axis wind turbine blade

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Old   July 3, 2019, 09:46
Default making mesh with 6 vertices to a horizontal axis wind turbine blade
  #1
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mostafa kamal
Join Date: Jun 2019
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hello everyone
iam trying to make a mesh domain as in 2.png using blockmesh ,but with 6 vertices instead of 8 vertices
i did so using the documentation of blockmesh utility but when i view the mesh on paraview it appears as shown in figures in the inlet and outlet there is a fine mesh at vertex 4 as shown
when i make checkmesh it tells me that the most of the mesh(7600) is hexahedra and a few is prisms (only 400)

my blockmeshDict is
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 6
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1;

vertices
(
( 0.000 0.000 0.000) // vertrex no 0
( 0.000 0.000 -110)
( -30 17.5 -110)
( -30 17.5 0.000)
( 30 17.5 0.000)
( 30 17.5 -110)



);

blocks
(
hex ( 0 1 2 3 4 5 5 4 ) (20 20 20) simpleGrading (1 1 1)
);

edges
(
arc 3 4 ( 0 35 0)
arc 2 5 ( 0 35 -110 )
);

boundary
(
inlet
{
type patch;
faces
(
(0 4 4 3)
);
}
outlet
{
type patch;
faces
(
(5 1 2 5)
);
}

outerWall
{
type wall;
faces
(
(3 4 5 2)
);
}
cyclic_half0
{
type cyclic;
neighbourPatch cyclic_half1;
transform rotational;
rotationAxis (0 0 1);
rotationCentre (0 0 0);
faces
(
(1 0 3 2 )
);
}
cyclic_half1
{
type cyclic;
neighbourPatch cyclic_half0;
transform rotational;
rotationAxis (0 0 1);
rotationCentre (0 0 0);
faces
(
(0 1 5 4)
);
}
);

mergeMatchPairs
(
);

// ************************************************** *********************** //


how can i solve this problem to make a uniform mesh as i dersire ?
thank you
Attached Images
File Type: png 1.png (177.0 KB, 9 views)
File Type: jpg 2.jpg (17.7 KB, 9 views)
File Type: png 3.png (100.1 KB, 9 views)
File Type: png 4.png (107.4 KB, 9 views)
File Type: png 5.png (138.5 KB, 9 views)
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Old   July 8, 2019, 03:57
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  #2
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Zander Meiring
Join Date: Jul 2018
Posts: 125
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You are collapsing on the wrong vertices. Where you define your block
Code:
hex ( 0 1 2 3 4 5 5 4 ) (20 20 20) simpleGrading (1 1 1)
you can see that the repeating vertices that you use are 4 and 5, which corresponds to the vertices on the top right of your block.

Based on your description, you want to collapse the vertices 0 and 1, and so your block needs to be rewritten as

Code:
hex ( 5 4 3 2 1 0 0 1 ) (20 20 20) simpleGrading (1 1 1)
Edit:
Your inlet and outlet patches also look wrongly defined. You might need to edit these
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