[salomama]

i am trying to generate a simple 2D rectangular mesh as a beginner but i get this error


Creating block mesh from
"/home/salma/foam/incompressible/icoFoam/cavity/case0/constant/polyMesh/blockMeshDict"
Creating curved edges
Creating topology blocks
--> FOAM Warning :
From function bool Foam::blockMesh::blockLabelsOK(Foam::label, const pointField&, const Foam::cellShape&) const
in file blockMesh/blockMeshCheck.C at line 173
out-of-range point label 4 (max = 3) in block 0
Creating topology patches


--> FOAM FATAL ERROR:
Cannot create mesh due to errors in topology, exiting !


From function Foam:olyMesh* Foam::blockMesh::createTopology(const Foam::IOdictionary&, const Foam::word&)
in file blockMesh/blockMeshTopology.C at line 561.

FOAM exiting





my blockmesh is this way
convertToMeters 0.1;

vertices
(
(0 0 0) //vortice0
(1.5 0 0) //vortice1
(1.5 0.60 0) //vortice2
(0 0.60 0) //vortice3
);

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

edges
(
);

boundary
(
inlet
{
type patch;
faces
(
(0 3 0 0)
);
}
outlet
{
type patch;
faces
(
(1 2 0 0)
);
}
symmetry
{
type symmetryPlane;
faces
(
(3 2 0 0)
);
}
);

mergePatchPairs
(
);



i dont know where is the problem

[clapointe]

The error is indicating that the mesher is trying to access a point (4) that doesn't exist. If you are trying to create a 2d rectangular mesh you'll need 8 points -- 2d meshes are created by defining one direction (eg z, for cartesian) as "empty". For a reference case check out the icoFoam tutorials -- it looks like you've been looking at these from the path to the case. Here's an example of the blockMesh for the square cavity, found here : https://github.com/OpenFOAM/OpenFOAM.../cavity/cavity.

Here's the mesh :

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

convertToMeters 0.1;

vertices
(
    (0 0 0)
    (1 0 0)
    (1 1 0)
    (0 1 0)
    (0 0 0.1)
    (1 0 0.1)
    (1 1 0.1)
    (0 1 0.1)
);

blocks
(
    hex (0 1 2 3 4 5 6 7) (20 20 1) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
    movingWall
    {
        type wall;
        faces
        (
            (3 7 6 2)
        );
    }
    fixedWalls
    {
        type wall;
        faces
        (
            (0 4 7 3)
            (2 6 5 1)
            (1 5 4 0)
        );
    }
    frontAndBack
    {
        type empty;
        faces
        (
            (0 3 2 1)
            (4 5 6 7)
        );
    }
);

mergePatchPairs
(
);

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

Caelan