Moving the vent location to either side of {TAIL ~ the vent} follower causes {HEAD ~ fluid} or gas to escape from one or the other cell 
Moving the vent location to either side of { TAIL ~ the vent } follower causes { HEAD ~ fluid } or gas to escape from one or the other cell
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH