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Pyro simulation smoke hang on in the air


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Hello guys, I am a new Houdini user, and my english is limited, may I try to say my problem with pyro simulation by my limited english. 

recently I did an explosion by pyro simulation, this simulated from 20 to 120 frame,  the simulate smoke hang on in the air that looks like doesn't move forward, just stop in the air from 50 frame to 70 frame, then smoke start move again after around 70 frame. 

I try to figure out what reason makes smoke stop in the air. I thinking the problem could be collision object, maybe some collision pieces are too close that makes  smoke can't through those object. 
every one have any idea? 

pyro smoke

smoke and collision

Thank you so much guys.

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