[kostnermo]

Hello everybody,

I am trying to assess mass flows through windows of a building.
My geometry looks like this (you can't see the whole domain but this is essentially what you need to know): https://postimg.org/image/6wkb4w6h3/

So I basically have a row of windows along two facades of a building/room and want to simulate the massflow through this geometry. I am therefore meshing inside as well as outside.

Depicted in yellow, you can see the faceSets (windows) which I create by using a topoSetDict. I use blockMesh in combination with snappyHexMesh for meshing my geometry.
Now, after executing topoSet I receive a cell id "-1" at the bottom of all of my slave cells which I later need for swak4Foam.

Excerpt from the bottom of contant/polyMesh/sets/window1SlaveCells

1540086 
1359863 
1359865 
1540090 
-1 
)

// ********

Excerpt of topoSetDict:

{
        name window1;
        type faceZoneSet;
        action new;
        source searchableSurfaceToFaceZone;
        sourceInfo
        {
                surface triSurfaceMesh;
                name "window_l.stl"; 
        }
}

{
        name window1SlaveCells;
        type cellSet;
        action new;
        source faceZoneToCell;
        sourceInfo
        {
                name window1;
                option slave;
        }
}

This, of course, causes an error when I try to run the simulation.

[0]
[0] --> FOAM FATAL ERROR:
[0] Illegal content -1 of set:window1SlaveCells of type cellSet
Value should be between 0 and 356166
[0]
[0]     From function topoSet::check(const label)
[0]     in file sets/topoSets/topoSet.C at line 200.
[0]
FOAM parallel run aborting

If I manually remove those "-1" cell ids and change the cell number accordingly, I am able to again run the simulation. However, it is quite tedious to do this every time I change the geometry.

Commands I used up until this issue occurres are:

blockMesh
surfaceFeatureExtract
snappyHexMesh
checkMesh (mesh is ok)
topoSet
simpleFoam

Does anybody have an idea what I am doing wrong or how to solve this issue?

Thank you for your time,

Patrick

--

OF301-d8a290b55d28
Ubuntu 16.04

[kostnermo]

I was able to narrow down the issue now. The problem arises when I change the normal vector of the surface in Rhino. I do this to have consistency later in the mass flows by swak4foam.
Is there a way to do this with OF as well?