[schmittp54]

I am asking for help about the setup of a driven cavity example, where at certain trigger times an internal barrier is attached. The wall velocity of the barrier is opposite to the lid movement, so that I expect one clockwise convection cell and one counterclockwise.

Instead the result (see attached screenshot) shows only convection above the barrier, which is located at half the vertical extent. The lower half is not circulating.

The following entries in 0/U specify U=(-1,0,0) at the barrier (patches "attachTop","attachBottom"). Why is this velocity not reached in the solution?

attachTop
{
type fixedValue;
value uniform (-1 0 0);
}
attachBottom
{
type fixedValue;
value uniform (-1 0 0);
}

I don't know how to proceed without someone's help. I'd very much appreciate if you could run the attached case, if my mistake is not obvious from the description above. These commands should reproduce my observation within a few seconds:

tar xzf newAttachDetach.tar.gz
cd newAttachDetach
blockMesh
faceSet
setsToZones -noFlipMap
icoDyMFoam

Thank you
Patricia