CFD Online Discussion Forums - [blockMesh] blockMesh crash with sigFpe

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blockMesh crash with sigFpe

hello friends
i wanna block a simple geometry!!! but i face to a problem, it's:

Create time

#0 Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam220/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#1 Foam::sigFpe::sigHandler(int) in "/opt/openfoam220/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2 in "/lib/x86_64-linux-gnu/libc.so.6"
#3 Foam::Time::readDict() in "/opt/openfoam220/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#4 Foam::Time::setControls() in "/opt/openfoam220/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#5 Foam::Time::Time(Foam::word const&, Foam::argList const&, Foam::word const&, Foam::word const&) in "/opt/openfoam220/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#6
in "/opt/openfoam220/platforms/linux64GccDPOpt/bin/blockMesh"
#7 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#8
in "/opt/openfoam220/platforms/linux64GccDPOpt/bin/blockMesh"
Floating point exception (core dumped)

i don't know what the problem is!!!
would you please help me?

Quick answer: Not enough information to diagnose the origin of the problem. Please follow the instructions given on this thread: http://www.cfd-online.com/Forums/ope...-get-help.html

edit: What you need to do is provide more details about how you got the error in the first place. For example: What is the content of the file "blockMeshDict" that resulted in that crash?

Quote:

Originally Posted by wyldckat (Post 576458)

this is my blockMeshdict:

Code:

/*--------------------------------*- C++ -*----------------------------------*\

| =========                 |                                                 |

| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |

|  \\    /   O peration     | Version:  2.2.0                                 |

|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |

|    \\/     M anipulation  |                                                 |

\*---------------------------------------------------------------------------*/

FoamFile

{

    version     2.0;

    format      ascii;

    class       dictionary;

    object      blockMeshDict;

}

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



convertToMeters 1;



vertices

(

    (0 0 0)

    (0.4 0 0)

    (0 0.02 0)

    (0.4 0.02 0)

    (0 0 -0.01)

    (0.4 0 -0.01)

    (0 0.02 -0.01)

    (0.4 0.02 -0.01)

);



blocks

(

    hex (0 1 3 2 4 5 7 6) (100 5 1) simpleGrading (1 1 1)

);



edges

(

);



boundary

(

    inlet

    {

        type patch;

        faces

        (

            (0 2 6 4)

        );

    }

    outlet

    {

         type patch;

         faces

         (

             (1 3 7 5)

         );

     } 

    wall

    {

        type wall;

        faces

        (

            (0 4 5 1)

            (2 6 7 3)

        );

    }

    frontAndBack

    {

        type empty;

        faces

        (

            (0 2 3 1)

            (4 6 7 5)

        );

    }

);



mergePatchPairs

(

);



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

Greetings Hamide,

I've gotten a very different result from the one you reported:

Code:

/*---------------------------------------------------------------------------*\

| =========                 |                                                 |

| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |

|  \\    /   O peration     | Version:  2.2.0                                 |

|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |

|    \\/     M anipulation  |                                                 |

\*---------------------------------------------------------------------------*/

Build  : 2.2.0-5be49240882f

Exec   : blockMesh

Date   : Dec 07 2015

Time   : 11:25:55

Host   : "machine"

PID    : 14207

Case   : /home/ofuser/OpenFOAM/ofuser-2.2.0/run/hamide/cavity

nProcs : 1

sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).

fileModificationChecking : Monitoring run-time modified files using timeStampMaster

allowSystemOperations : Disallowing user-supplied system call operations



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

Create time



Creating block mesh from

    "/home/ofuser/OpenFOAM/ofuser-2.2.0/run/hamide/cavity/constant/polyMesh/blockMeshDict"

Creating curved edges

Creating topology blocks

Creating topology patches



Creating block mesh topology

--> FOAM Warning : 

    From function cellModel::mag(const labelList&, const pointField&)

    in file meshes/meshShapes/cellModel/cellModel.C at line 128

    zero or negative pyramid volume: -1.33333e-05 for face 0

--> FOAM Warning : 

    From function cellModel::mag(const labelList&, const pointField&)

    in file meshes/meshShapes/cellModel/cellModel.C at line 128

    zero or negative pyramid volume: -1.33333e-05 for face 1

--> FOAM Warning : 

    From function cellModel::mag(const labelList&, const pointField&)

    in file meshes/meshShapes/cellModel/cellModel.C at line 128

    zero or negative pyramid volume: -1.33333e-05 for face 2

--> FOAM Warning : 

    From function cellModel::mag(const labelList&, const pointField&)

    in file meshes/meshShapes/cellModel/cellModel.C at line 128

    zero or negative pyramid volume: -1.33333e-05 for face 3

--> FOAM Warning : 

    From function cellModel::mag(const labelList&, const pointField&)

    in file meshes/meshShapes/cellModel/cellModel.C at line 128

    zero or negative pyramid volume: -1.33333e-05 for face 4

--> FOAM Warning : 

    From function cellModel::mag(const labelList&, const pointField&)

    in file meshes/meshShapes/cellModel/cellModel.C at line 128

    zero or negative pyramid volume: -1.33333e-05 for face 5

--> FOAM Warning : 

    From function blockMesh::createTopology(IOdictionary&)

    in file blockMesh/blockMeshTopology.C at line 255

    negative volume block : 0, probably defined inside-out



Check topology



  Basic statistics

    Number of internal faces : 0

    Number of boundary faces : 6

    Number of defined boundary faces : 6

    Number of undefined boundary faces : 0

  Checking patch -> block consistency



Creating block offsets

Creating merge list .



Creating polyMesh from blockMesh

Creating patches

Creating cells

Creating points with scale 1



Writing polyMesh

----------------

Mesh Information

----------------

  boundingBox: (0 0 -0.01) (0.4 0.02 0)

  nPoints: 1212

  nCells: 500

  nFaces: 2105

  nInternalFaces: 895

----------------

Patches

----------------

  patch 0 (start: 895 size: 5) name: inlet

  patch 1 (start: 900 size: 5) name: outlet

  patch 2 (start: 905 size: 200) name: wall

  patch 3 (start: 1105 size: 1000) name: frontAndBack



End

The problem is that the order of the vertices is incorrect. Please study the OpenFOAM User Guide in more detail. You can find the location of the PDF file if you run this command:

Code:

echo $WM_PROJECT_DIR/doc/Guides-a4/UserGuide.pdf

The other possibility is for you to install OpenFOAM 3.0.0, because that version allows for any order of the vertices.

Best regards,
Bruno

thank you very much
but i cant understand what you mean!!!!
do you mean i should make the finer mesh?
i don't know how improve it!!!!!! :(

and the other problem is:
i'm new in openFoam. i just can run it's tutorial and change them according to my need...
i can block this geometry in pisoFoam algorithm tutorial but not in the simpleFoam!!!!!
the error i sent you was in simpleFoam algorithm tutorial

Hi Hamide,

Quote:

Originally Posted by hamide (Post 576624)

but i cant understand what you mean!!!!
do you mean i should make the finer mesh?

I mean that the problem is explained in section 5.3 in the User Guide: http://cfd.direct/openfoam/user-guide/blockMesh/

The problem you have is with the way the vertices are ordered:

Code:

vertices

(

    (0 0 0)

    (0.4 0 0)

    (0 0.02 0)

    (0.4 0.02 0)

    (0 0 -0.01)

    (0.4 0 -0.01)

    (0 0.02 -0.01)

    (0.4 0.02 -0.01)

);

And also the way they are ordered in the "faces" lists. For example, one of the problems could be this:

Code:

The problem might be that the correct order is possibly "(4 2 6 0)", but I don't know if that is the solution or not.

Quote:

Originally Posted by hamide (Post 576627)

i'm new in openFoam. i just can run it's tutorial and change them according to my need...
i can block this geometry in pisoFoam algorithm tutorial but not in the simpleFoam!!!!!
the error i sent you was in simpleFoam algorithm tutorial

Have you studied the 3 tutorials from the User Guide? See here: http://cfd.direct/openfoam/user-guide/tutorials/

Then you should take one step at a time. One small change and then test. Practice with each tutorial case. Learn how each detail works. Only then you should try and change to another tutorial.

Best regards,
Bruno

Quote:

Originally Posted by hamide (Post 576627)

Hi,

As wyldcat said you have to be careful with vertices order. I have completely taught the basics of blockMesh using the famous cavity problem OF in here.
If you had any other questions, you may ask here to get more detailed answers.

Soon there will be a Persian book out regarding "Meshing in OpenFOAM".

Best.