It is a current state in fire behavior when a fire occurs in the compartment where the fire discharge equipment is set up that there are still a lot of uncertain points. There is a possibility to influence the fire fighting activity and the shelter action by formation smoke layer being stirred in the compartment when the fire discharge equipment operates by a fire in such a compartment. Then, smoke and fire plume behavior that flow out from the compartment opening to the passage when the fire discharge equipment operates are clarified.