Trying to add multiple smoke simulations running at the same time in 2.8. but only one will render at a time
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In your physics settings, go to the cache tab and choose free all bakes
Once you have done that choose Bake all dynamics. That should do what you need.
FYI: If you want your smoke simulations to interact, the easiest method is to have them in one simulation, else it becomes tricky. Someone else may have a way to do so but this is the best method I can think of.
Good luck with your project and I hope I helped,
BFB
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$\begingroup$ Tried baking all dynamics and its acting real wonky. Quickly flickering between all the simulations but never show more than one at a time $\endgroup$ – trburns Apr 1 '19 at 21:29
