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I set the flow type to outflow, it's supposed to be not interacting with the ceiling as the Blender Manual says, the ceiling will be acting like a black hole, however, below is my screen shot and I can observe the ceiling is colliding with the smoke, why is that thankyou !

enter image description here

user3505400
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1 Answers1

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It's strange, I do not know if this is the intended design, everytime I change the setting of the flow, I need to re-select the "replay" item to make it valid as shown below, enter image description here

The issue I came accross resulted from the cache from the previous settings not freed up until I re-select the "replay", so this is my solution.

user3505400
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  • The cache type Replay is kind of a "on the fly" simulation, and sometimes can be screwed up if the cache isn't freed correctly. I usually don't simulate with Replay because if I set a little more than the default domain resolution it becomes too slow in my viewport. But that's of course dependent on your hardware. I prefer Modular or All and maybe enable Is Resumable. Then I can hit "Bake" or "Free" to simulate or get rid of a simulation. Just for testing and checking settings it doesn't even take long if you're still on a lower resolution. – Gordon Brinkmann May 17 '21 at 07:19