[fds-smv] Two layer walls on exterior mesh boundary

[Fork]

I have a case with two rooms (a fire room and an adjacent room)
separated by an inner wall (defined as an obstacle) and there is also
a door in that innerwall (open 20 degrees). The outside walls are not
defined, thus I use the exterior boundaries of the mesh as outside
walls/floor/ceiling of the rooms.

I now want to make two layer walls on all walls (both inner and
outer). The inner layer of all outer walls shall be gypsum and the
outer layer of all outer walls shall be insulation. For the inner wall
and door there shall be gypsum towards the fire room and insulation
towards the adjacent room.

I understand that I can use SURF_ID(6) for the inner wall and door.
But how does it work for the outer walls, which I have not "defined"?
My guess is that I define SURF_DEFAULT as the two layer surface. But
in which order does FDS calculate the layers? Is the first layer
always facing the inside of the room and the second layer always the
outside of the mesh, on all exterior boundaries regardless of the
directions in xx,yy,zz? Or does FDS put the layers in some kind of -x
to +x order and in that case, how do I define different orders of
layers for my outer walls, which are not any obstacles but only mesh
boundaries?

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[dr_jfloyd]

See the User's Guide 7.4 and 8.3.1