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ayhan515 October 12, 2011 08:36

engineFoam new mesh problem
 
I run tutorial kivaTest case without fail.
I want to increase compression ratio value, like diesel engine, about 20.

I converted existent kiva mesh (otape17) to OpenFoam mesh(polymesh) with kivaToFoam command. It is ok no problem.
Then i converted OpenFoam mesh(polymesh) to a Fluent mesh(*.msh) with foamMeshToFluent command. It is ok no problem.

I deleted polyMesh folder which in constant folder.

This time I converted Fluent mesh(*.msh) to OpenFoam mesh(polymesh) to a by fluent3DMeshToFoam command. It is ok no problem.
I execute engineFoam command. it runs without problem.

Code:

kiva mesh ---->> OpenFoam mesh  ---->>  Fluent Mesh
 (otape17)              (polyMesh)      <<----      (*.msh) 
                                          |
                                          |
                                          v
                                    engineFoam
                                  (works well)

After I changed the Fluent mesh then I convert new Fluent mesh to OpenFoam mesh(polymesh) to a by fluent3DMeshToFoam command. It is ok no problem.

Code:

New Fluent Mesh  ---->> New OpenFoam mesh    xxxx    engineFoam
    (New.msh)                    (polyMesh)                              (Failed)

When I execute engineFoam command with new mesh. It gave this error message then exit.

Code:

// * * * * * * * * * * * * * * *  * * * * * * * * * * * * * * * //
Create engine time

Create mesh for time = -180

Selecting engineMesh layered


--> FOAM FATAL ERROR:
cannot find cylinderHead patch

    From function engineMesh::engineMesh(const IOobject& io)
    in file engineMesh/engineMesh/engineMesh.C at line 90.

FOAM exiting

I think problem caused from "cylinderHead patch".

In kivaToFoam command this problem solved by "Transfered xx faces from liner region to cylinder head"


Code:

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Reading kiva grid from file "otape17"
Finished reading KIVA file
Transfered 500 faces from liner region to cylinder head

Default patch type set to empty
Writing polyMesh
Writing cell zoning info to file: "/home/ayhan/OpenFOAM/ayhan-2.0.1/run/tutorials/combustion/engineFoam/kivaTest/constant/region0/cellZoning"
End

I suppose solution in the below file
/opt/openfoam201/applications/utilities/mesh/conversion/kivaToFoam/readKivaGrid.H
Code:

// Transfer liner faces that are above the minimum cylinder-head z height
// into the cylinder-head region
if
(
    pFaces[LINER].size()
 && pFaces[LINER][0].size()
 && pFaces[CYLINDERHEAD].size()
 && pFaces[CYLINDERHEAD][0].size()
)
{
    scalar minz = GREAT;

    forAllConstIter(SLList<face>, pFaces[CYLINDERHEAD][0], iter)
    {
        const face& pf = iter();

        forAll(pf, pfi)
        {
            minz = min(minz, points[pf[pfi]].z());
        }
    }

    minz += SMALL;

    SLList<face> newLinerFaces;

    forAllConstIter(SLList<face>, pFaces[LINER][0], iter)
    {
        const face& pf = iter();

        scalar minfz = GREAT;
        forAll(pf, pfi)
        {
            minfz = min(minfz, points[pf[pfi]].z());
        }

        if (minfz > minz)
        {
            pFaces[CYLINDERHEAD][0].append(pf);
        }
        else
        {
            newLinerFaces.append(pf);
        }
    }

    if (pFaces[LINER][0].size() != newLinerFaces.size())
    {
        Info<< "Transfered " << pFaces[LINER][0].size() - newLinerFaces.size()
            << " faces from liner region to cylinder head" << endl;
        pFaces[LINER][0] = newLinerFaces;
    }

    SLList<face> newCylinderHeadFaces;

    forAllConstIter(SLList<face>, pFaces[CYLINDERHEAD][0], iter)
    {
        const face& pf = iter();

        scalar minfz = GREAT;
        forAll(pf, pfi)
        {
            minfz = min(minfz, points[pf[pfi]].z());
        }

        if (minfz < zHeadMin)
        {
            pFaces[LINER][0].append(pf);
        }
        else
        {
            newCylinderHeadFaces.append(pf);
        }
    }

    if (pFaces[CYLINDERHEAD][0].size() != newCylinderHeadFaces.size())
    {
        Info<< "Transfered faces from cylinder-head region to linder" << endl;
        pFaces[CYLINDERHEAD][0] = newCylinderHeadFaces;
    }
}

The question is how can i apply this solving. How can i transfer faces from liner region to cylinder head while i convert new fluent mesh to polyMesh.

Thanks in advance.

ayhan515 October 18, 2011 09:03

I used checkMesh command now. The output is below.

Code:

/*---------------------------------------------------------------------------*\
| =========                |                                                |
| \\      /  F ield        | OpenFOAM: The Open Source CFD Toolbox          |
|  \\    /  O peration    | Version:  2.0.1                                |
|  \\  /    A nd          | Web:      www.OpenFOAM.com                      |
|    \\/    M anipulation  |                                                |
\*---------------------------------------------------------------------------*/
Build  : 2.0.1-51f1de99a4bc
Exec  : checkMesh
Date  : Oct 18 2011
Time  : 15:46:26
Host  : ubuntu
PID    : 2780
Case  : /home/ayhan/OpenFOAM/ayhan-2.0.1/run/tutorials/combustion/engineFoam/kivaTest-fluent-11-10-2011
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

Create polyMesh for time = -180

Time = -180

Mesh stats
    points:          30742
    faces:            85742
    internal faces:  79522
    cells:            27544
    boundary patches: 3
    point zones:      0
    face zones:      1
    cell zones:      1

Overall number of cells of each type:
    hexahedra:    27544
    prisms:        0
    wedges:        0
    pyramids:      0
    tet wedges:    0
    tetrahedra:    0
    polyhedra:    0

Checking topology...
    Boundary definition OK.
    Cell to face addressing OK.
    Point usage OK.
    Upper triangular ordering OK.
    Face vertices OK.
    Number of regions: 1 (OK).

Checking patch topology for multiply connected surfaces ...
    Patch              Faces    Points  Surface topology                 
    piston              1326    1400    ok (non-closed singly connected) 
    liner              2710    2858    ok (non-closed singly connected) 
    cylinderhead        2184    2260    ok (non-closed singly connected) 

Checking geometry...
    Overall domain bounding box (-0.046 -0.0459845 -0.0089896) (0.046 0.0459845 0.20335)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (2.0111e-20 -4.34397e-19 6.81738e-20) OK.
    Max cell openness = 2.54332e-16 OK.
    Max aspect ratio = 68.0635 OK.
    Minumum face area = 4.94833e-07. Maximum face area = 8.23324e-05.  Face area magnitudes OK.
    Min volume = 6.14138e-10. Max volume = 2.72275e-07.  Total volume = 0.00126259.  Cell volumes OK.
    Mesh non-orthogonality Max: 86.981 average: 37.3601
  *Number of severely non-orthogonal faces: 5320.
    Non-orthogonality check OK.
  <<Writing 5320 non-orthogonal faces to set nonOrthoFaces
    Face pyramids OK.
    Max skewness = 3.89796 OK.

Mesh OK.

End

Code:

/*---------------------------------------------------------------------------*\
| =========                |                                                |
| \\      /  F ield        | OpenFOAM: The Open Source CFD Toolbox          |
|  \\    /  O peration    | Version:  2.0.1                                |
|  \\  /    A nd          | Web:      www.OpenFOAM.com                      |
|    \\/    M anipulation  |                                                |
\*---------------------------------------------------------------------------*/
Build  : 2.0.1-51f1de99a4bc
Exec  : engineFoam
Date  : Oct 18 2011
Time  : 15:47:49
Host  : ubuntu
PID    : 2985
Case  : /home/ayhan/OpenFOAM/ayhan-2.0.1/run/tutorials/combustion/engineFoam/kivaTest-fluent-11-10-2011
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 engine time

Create mesh for time = -180

Selecting engineMesh layered


--> FOAM FATAL ERROR:
cannot find cylinderHead patch

    From function engineMesh::engineMesh(const IOobject& io)
    in file engineMesh/engineMesh/engineMesh.C at line 90.

FOAM exiting

Quote:

I still get same error when i try to use engineFoam.
While i am writing this above message i noticed :eek: these
Quote:

cylinderhead 2184 2260 ok (non-closed singly connected)
and
Quote:

cannot find cylinderHead patch
Then i changed cylinderhead to cylinderHead in boundary file of polyMesh folder.
Then now engineFoam is working. I am really shame on myself. :rolleyes:

enjoybitter May 1, 2012 04:29

Good Experience!
Thanks for your sharing.

kaveh19 August 9, 2015 08:19

Hi ayhan515,
thanks for your shearing.
how we can figure the volume of default geometry out and then know the compression ratio and clearance volume in kivaTest ?
thanks in advance.

ayhan515 August 10, 2015 05:37

Quote:

Originally Posted by kaveh19 (Post 558831)
Hi ayhan515,
thanks for your shearing.
how we can figure the volume of default geometry out and then know the compression ratio and clearance volume in kivaTest ?
thanks in advance.

open a openfoam terminal and use these commands.
Code:

1
cd combustion/engineFoam/kivaTest
2
kivaToFoam
3
engineCompRatio

the output
Code:

/*---------------------------------------------------------------------------*\
| =========                |                                                |
| \\      /  F ield        | OpenFOAM: The Open Source CFD Toolbox          |
|  \\    /  O peration    | Version:  2.4.0                                |
|  \\  /    A nd          | Web:      www.OpenFOAM.org                      |
|    \\/    M anipulation  |                                                |
\*---------------------------------------------------------------------------*/
Build  : 2.4.0-f0842aea0e77
Exec  : engineCompRatio
Date  : Aug 10 2015
Time  : 12:29:32
Host  : "ayhan-virtual-machine"
PID    : 3716
Case  : /home/ayhan/OpenFOAM/ayhan-2.4.0/run/tutorials/combustion/engineFoam/kivaTest
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create engine time

Create mesh for time = -180

Selecting engineMesh layered
deckHeight: 0.085639
piston position: 0
Using dynamicCode for functionObject timeStep at line 58 in "/home/ayhan/OpenFOAM/ayhan-2.4.0/run/tutorials/combustion/engineFoam/kivaTest/system/controlDict.functions.timeStep"
Creating new library in "dynamicCode/setDeltaT/platforms/linux64GccDPOpt/lib/libsetDeltaT_7bdeade1ab21a2b1d5fab42a96396cc9eda6b864.so"
Invoking "wmake -s libso /home/ayhan/OpenFOAM/ayhan-2.4.0/run/tutorials/combustion/engineFoam/kivaTest/dynamicCode/setDeltaT"
wmakeLnInclude: linking include files to ./lnInclude
Making dependency list for source file functionObjectTemplate.C
Making dependency list for source file FilterFunctionObjectTemplate.C
'/home/ayhan/OpenFOAM/ayhan-2.4.0/run/tutorials/combustion/engineFoam/kivaTest/dynamicCode/setDeltaT/../platforms/linux64GccDPOpt/lib/libsetDeltaT_7bdeade1ab21a2b1d5fab42a96396cc9eda6b864.so' is up to date.
CA = 0
deltaZ = 0.08423
clearance: 0.001409
Piston speed = 4.2115 m/s

Vmax = 0.000631297, Vmin = 7.15569e-05
Vmax/Vmin = 8.82231


End


kaveh19 August 10, 2015 08:45

hi ayhan515,
I appreciate u.
yes ,I did ,but unfortunately I don't have any idea.
I have some question . would you mind helping me?
1) I want to run the bore*stroke=76*66 in different compression ratio e.g.,12 and 20. How can i create this C.R ?
2) When i run bore*stroke = 86*86 for KivaTest ,it runs until -5 not 60 . what's the reason?
thanks in advance.


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