Abstract
The Yumeshima tunnels are the immersed tunnels which connect between the reclaimed grounds at the Osaka harbor. As undersea tunnels, The inlets are steep downward slopes. It is quite likely that the smoke moves along the ceiling strongly to the stop vehicles side. It was asked for the exhaust wind velocity which suppresses ascension of smoke using CFD. In order to realize the wind velocity, It was devised connecting the duct of the ventilation station to the ceiling part of the lowest point of entrance of side box part.
