Boundary Conditions
 

hi everyone

I am Doing a simulation of valveless pulsejet engine.

After exhaust cycle when the pressure in the engine drops below the atm. pressure ,the flow is supposed to reverse at outlets,so now they become inlets leading the fresh air rushing in to the combustion space.

basically same the ports or sections toggle between inlet and outlet for intake and exhaust cycle,And thats the story behind theoperation of engine
Now how can i impose boundary conditions that are pressure dependent


regards