[bongbang]

How can I extrude radially (i.e. in the normal direction) off a face on a cylinder wall? Leaving the direction as "Normal" doesn't work. If I simply select a 3D edge as the direction vector, that doesn't work (result pictured below) because the vector is not really normal to the entire surface.

[amuzeshi]

Originally Posted by bongbang

How can I extrude radially (i.e. in the normal direction) off a face on a cylinder wall? Leaving the direction as "Normal" doesn't work. If I simply select a 3D edge as the direction vector, that doesn't work (result pictured below) because the vector is not really normal to the entire surface.

well; copy the following as extrudeMeshDict and place it in /system folder.

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  6
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      extrudeMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
sourceCase ".";
constructFrom mesh;
sourcePatches (wall);
extrudeModel        linearNormal;
nLayers             20;
expansionRatio      1.0;
linearNormalCoeffs { thickness  .01;}
mergeFaces false;   // true;
mergeTol 0;

Then run:

extrudeMesh

That's it !