Can the Fluent be used to simulate impulsive flow?
 

I read an article about the vortex dipoles generate by Jet flow. What's more, it contains two typical situations, one is the continuous Jet flow , the other is the impulsive flow(the jet flow only generate at t=0s). I had simulated the continuous Jet flow in Ansys Fluent but I have no ideas about how to realize the second situations(impulsive jet flow). By the way, this is two-dimensional flow.