[Waseem_FDS]

I am simulating an under-ventilated experiment. Because of the wrong predictions of the oxygen concentration, the plume is moving towards the opening.
I think the problem is caused by the mixed is burnet (fast chemistry) assumption that is used in the combustion model, the assumption is called mixed is burnt or fast chemistry assumption. The smoke view shows that:
• The oxygen in the room is consumed
• Then, the fuel starts combusting when it contacts the oxygen near the opening
• Then, the plume is at the opening, not above the burner
• Then I got unrealistic results for the room temperature and the height of the flame
How to overcome this, without using the DNS?