Mesh check fail
 

Hi all,

Currently running trials for solidworks -> pointwise -> openfoam -> paraview process of simulations. I have created my model in solidworks, then created a hybrid mesh with openfoam boundaries in pointwise. When i import and execute checkMesh in terminal i get the following...

***Boundary openness (-1.25496e-08 0.00676147 1.33344e-05) possible hole in boundary description.
***Open cells found, max cell openness: 1, number of open cells 69988
<<Writing 69988 non closed cells to set nonClosedCells

Failed 2 mesh checks.

Anyone elese had similar issues or used the same program processes that i am trying to achieve? Any help would be welcomed.

Regards

John

eddiejohn,

What version of Pointwise are you using (Help > About Pointwise)? There was a problem with the orientation of prism blocks getting reversed when exported to OpenFOAM - and thus causing the error you're seeing - but that was fixed relatively recently.

If possible, it would also be helpful to see an image of what your mesh (in Pointwise) looks like.

-Chris

Chris,

Thankyou for your reply. I am running the following version;
Pointwise V16.04 Release 3 -- Optimized Build 0138141200 Windows 64-bit. Its a 30 day trial.


Please find attatched a jpeg of the mesh in pointwise. Tried just ignoring the error and running OpenFoam but to no avail. Any ideas?



Thanks


John

Who are you currently evaluating for/with? Your mesh looks fine in the picture but you might have to send it to me to look at it closer. Let me know if you are able to - send me an email.

checkMesh fail
 

hello everybody,

I'm using the rhoCentral Foam (2.0 version) and I have been problems to generate my mesh. My mesh is composed by two regions, the first one is rectangular and the second one is a parallelepiped. For the region when I run the commands blockMesh and checkMesh everything is ok, but when I introduce the second region the openFoam give the following error: "number of edges not aligned or perpendicular to non-empty directions". I substituted the parallelepiped region for other rectangular region and everything works fine. Maybe the openFoam don't accept angles in the mesh ? Somebody could help me ? Thanks

hello John,

Maybe you are allready aware of this, so maybe an irrelevant answer.
As far as I know solid works draws the hardware (pipe wall), where openfoam needs a mesh of the fluid (inside of pipe). so you need to subtract the hardware from the enclosing fluid and mesh this.

hope this helps
Wouter

mesh issue
 

Hi foamers !

I've an issue with my mesh generated with blockMesh and snappyHexMesh (OpenFoam V1.7) with a geometry given by a .obj file. I work in 2D, but the mesh present some errors and I can't find why ! Can sb help me ??
I think that errors come from some edges that pass through several cells and even through the foil !
I put a picture of my mesh and my snappyHexMeshDict file down below !
Thanks in advance!

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.7.1 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object snappyHexMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

// Which of the steps to run
castellatedMesh true;
snap true;
addLayers true;


geometry
{
wing_NACA66.obj
{
type triSurfaceMesh;
}

refinementBox
{
type searchableBox;
min (-0.5 -0.5 -1);
max ( 2 0.5 1);
}
};



// Settings for the castellatedMesh generation.
castellatedMeshControls
{

maxLocalCells 1000000;


maxGlobalCells 2000000;

minimumRefine

minRefinementCells 100;

nCellsBetweenLevels 6;





features ();




refinementSurfaces
{
wing_NACA66.obj
{

level (4 4);
}
}


resolveFeatureAngle 30;



refinementRegions
{
//refinementBox
//{
// mode inside;
// levels ((1e15 3));
//}
wing_NACA66.obj
{
mode distance;
levels ((0.15 4) (0.3 3) (0.4 2));
}
}



locationInMesh (-0.5 0 0);


allowFreeStandingZoneFaces true;
}



snapControls
{

nSmoothPatch 3;


tolerance 4.0;


nSolveIter 30;

nRelaxIter 5;
}




addLayersControls
{

relativeSizes false;

layers
{
"wing.*"
{
nSurfaceLayers 3;
}
}

expansionRatio 1.2;

finalLayerThickness 0.002;

minThickness 0.0002;

nGrow 0;


// Advanced settings


featureAngle 60;

nRelaxIter 5;

nSmoothSurfaceNormals 1;


nSmoothNormals 3;


nSmoothThickness 10;

maxFaceThicknessRatio 0.5;


maxThicknessToMedialRatio 0.3;


minMedianAxisAngle 90;


nBufferCellsNoExtrude 0;



nLayerIter 50;
}




meshQualityControls
{

maxNonOrtho 65;


maxBoundarySkewness 20;
maxInternalSkewness 4;

maxConcave 80;

minVol 1e-13;

minTetVol 1e-20;


minArea -1;


minTwist 0.05;

//- minimum normalised cell determinant

minDeterminant 0.001;


minFaceWeight 0.05;


minVolRatio 0.01;


minTriangleTwist -1;

nSmoothScale 4;

errorReduction 0.75;
}



debug 0;


mergeTolerance 1E-6;


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

[IMG]file:///mnt/home/stagiaires/marie-alix.lorin/Desktop/Capture.png[/IMG]

and the picture !