CFD Online Discussion Forums - [surface handling] surfaceFeatureExtract

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- - [surface handling] surfaceFeatureExtract (https://www.cfd-online.com/Forums/openfoam-meshing/154855-surfacefeatureextract.html)

surfaceFeatureExtract

I work on DTCHull but by snappyhexmesh I get

FOAM FATAL IO ERROR:
Could not open "C:/OpenFOAM/cygwin64/home/Windschip/OpenFOAM/Windschip-2.3.x/run/DTCHull/constant/triSurface/DTC-scaled.eMesh"

I dont know how I get . eMesh in the triSurface
Ron:confused:

I am looking for the the commandline of surfaceFeatureExtract.:confused:
Ron

surfaceFeatureExtract

I try but i can't find the solution to change DTC-scaled.stl in DTC-scaled .emesh
I haven seen some solutions but it looks like that in OpenFoam 2.3.x something is changed. Which commandoline is needed to change the .stl in . eMesh

Hi Ron,

you just need to use the command "surfaceFeatureExtract" in your case folder.
To use the command you need to store your .stl -files in /constant/triSurface and make sure you have a surfaceFeatureExtractDict" -file in /system .

A surfaceFeatureExtractDict should look like :

Code:

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

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

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

|  \\    /   O peration     | Version:  2.3.0                                 |

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

|    \\/     M anipulation  |                                                 |

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

FoamFile

{

    version     2.0;

    format      ascii;

    class       dictionary;

    object      surfaceFeatureExtractDict;

}

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



main.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;

}



orifice.stl

{

    extractionMethod    extractFromSurface;

    extractFromSurfaceCoeffs

    {

       includedAngle   150;

    }

    writeObj                yes;

}



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

You just have to modify the names to fit to your .stl -files... the values and options don't need adjustment.

regards
Alex

Hi Alex
The surfaceFeatureExtractdict file is in the system of DTCHull and also the dtc-scaled stil is in it
when I type in the DTCHull case folder:
surfaceFeatureExtract/constant/triSurface/DTC-scaled.stl DTC-scaled
I get
bash: surfaceFeatureExtract/constant/triSurface/DTC-scaled.stl: No such file or directory

Windschip@Asus ~/OpenFOAM/Windschip-2.3.x/run/DTCHull/system
$ Usage: C:\OpenFOAM\cygwin64\opt\OpenFOAM\OpenFOAM-2.3.x\platforms\cygwin64mingw-w64DPOpt\bin\surfaceFeatureExtract.exe [OPTIONS]
bash: Usage:: opdracht niet gevonden

What is it I do wrong?
Ron

Hi Ron,

no need to use this big font ;)

The stl files have to be in /constant/triSurface folder if it not exists... create it.

When you are in your DTCHull case folder

just type "surfaceFeatureExtract"

regards
Alex

Thank You Alex. The eMesh has succeed.
Ron