Flame in an animation I have been trying to get fire on an "Ark of the Covenant" for months.  It shows that it is there when I run the Timeline playing the frames.  I set everything up in the node editor, exactly as the tutorials say.  But the flame still will not animate.  I don't use GPU. 
Does anyone know how to solve this problem.

Thank you very much.
I think you need to "bake your simulation"
It sounds like you are recalculating it every single time you play it
and your computer isnt fast enough to calculate the animation in real time

But if you bake it, it will save the calculations so it wont have to 
re-calculate it all the time. 

https://www.blender.org/manual/physics/smoke/baking.html