These effects were created with Unity's VFX Graph for an educational VR project.
Unfortunately I lost some great effects due to not having access to an older cloud storage account.
Here are the leftover images I gathered after losing the files.
Started with a tutorial flame to get the gist of it.
A "filled" fire circle wasn't quite what we were after, but could've worked in another situation.
Foggy/powdery smoke was implemented for an event where the player is extinguishing a fire.
Here I played a lot with the particles' 'color over lifetime' s and implemented math to create more flickering.
In the scene, the fire was contained in an open cylinder, so I could optimize a bit by not spawning particles within the sphere or circle.