[jiaodanuma]

Hello,

Sorry for the simple question, but I'm confused with when I run surfaceFeatureExtract to extract the edge features, .eMesh.gz format instead of .eMesh format generated in the /constant/triSurface file as illustrated in the attached picture triSurface. Besides, .gz format generated in extendedFeatureEdgeMesh file too. After decompressed the .gz file using gzip, the file showing no features were extracted:
[CODE]
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.2.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format binary;
class featureEdgeMesh;
location "constant/triSurface";
object cube.eMesh;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //


// points:

0


// edges:

0

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


// ************************************************** *********************** //
[CODE]

The setting of surfaceFeatureExtractDict is listed as following, which is exactly the same with case flange provided by the tutorial and I can't find any utility is related with the writing format.

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.1                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      surfaceFeatureExtractDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

cube.stl
{
    // How to obtain raw features (extractFromFile || extractFromSurface)
    extractionMethod    extractFromSurface;

    extractFromSurfaceCoeffs
    {
        // Mark edges whose adjacent surface normals are at an angle less
        // than includedAngle as features
        // - 0  : selects no edges
        // - 180: selects all edges
        includedAngle   150;
    }

    // Write options

        // Write features to obj format for postprocessing
        writeObj                yes;
}


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

BTW, can anyone explain why "flange_.*" is used in addLayersControls to add layers in the flange tutorial? Thank you very much!

// Settings for the layer addition.
addLayersControls
{
    // Are the thickness parameters below relative to the undistorted
    // size of the refined cell outside layer (true) or absolute sizes (false).
    relativeSizes true;

    // Per final patch (so not geometry!) the layer information
    layers
    {
        "flange_.*"
        {
            nSurfaceLayers 1;
        }
    }

[open]

I guess you might have worked this out by now but for future reference...

system/controDict
writeCompression [off OR uncompressed]

Note that one can change this setting (along with system/controlDict: writeFormat [acsii OR binary]) then use the foam utility foamFormatConvert to switch data formats. It affects all reconstructed data including 0 folder and mesh.