This is a paid asset, but now you can download Fluid Flames for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Fluid Flames v1.7
(Tested with Unity version 2020.3.23f1)
This dynamic fluid-based flames simulator is incredibly flexible. It can simulate candles, bonfires, flying fireballs and anything else that burns. It uses the navier-stokes differential equations to fully simulate the flow of fuel, heat, and oxygen in the environment in order to get an accurate result. And yet, it runs lightning fast. Try it, you won’t be disappointed!
Features:
*Set up in minutes
*9 adjustable parameters including fuel rate, wind direction, heat buoyancy, etc.
*Detail level adjustable
*Use one of the provided heat spectrums to implement colored or toon shaded flames, or create your own.
*REQUIRES a GPU capable of shader model 3.5.