[hfs]

Hi,

How can we orient or flip face normals? I have an internal patch .. some of its faces have reverse normals so I have to flip them. Any ideas?

Regards

[hfs]

I have got the internal patch after using snappyHexMesh .. and then createBuffles ..

[hfs]

Originally Posted by hfs

Hi,

How can we orient or flip face normals? I have an internal patch .. some of its faces have reverse normals so I have to flip them. Any ideas?

Regards

ScreenShots:

[hfs]

Detailed description of the problem is posted here:
http://www.cfd-online.com/Forums/ope...tml#post437560

[manju819]

You can use the flip option to revert the normals.

for example this is my cyclic patch

cyclicFaces1
{
type faceZone;
zoneName jetFan1;
patches
{
master
{
name jetFan1_half0;
type cyclic;
featureCos 0.9;
neighbourPatch jetFan1_half1;
}
slave
{
name jetFan1_half1;
type cyclic;
featureCos 0.9;
neighbourPatch jetFan1_half0;
}
}
}


which get the directions by default from the mesh orientation. Now If want to revert I put the option flip true; as shown below



cyclicFaces1
{
type faceZone;
zoneName jetFan1;
flip true;
patches
{
master
{
name jetFan1_half0;
type cyclic;
featureCos 0.9;
neighbourPatch jetFan1_half1;
}
slave
{
name jetFan1_half1;
type cyclic;
featureCos 0.9;
neighbourPatch jetFan1_half0;
}
}
}

and then if you run createBaffles it will revert the normals.

[anufagbemi]

how can you tell if your normals have been flipped or wrong orientation in openfoam/paraview.

[jaydeep]

Open your stl/surface in paraview -
sources >> search >> generate surface normals
then
sources >> glyph >> select normals under vectors