Hi all,I'm a beginner and I want to transform my particule to a flame as in the picture
What is the best apporoch?

I think you can drop down a pyrosource -> initialize as "smoke"
Then drop down a volume rasterize attributes, use 'density' and play with settings to get the look you want.

In the video it look like a flames but with green colour...I think about add my particule as a you u said to a Pyro source..rasterise..and add it to a Pyro solver to simulate a flame who goes from the out side to the inside...in the video it seems that the heat source is situated on the border of the door and push the fuel perpendicularly to the border....and with adding some random wind direction and noise maybe I will get a result....I don't know
May be it just particules with some colours and not a flames...
This is the link of the video:
https://youtu.be/gSoDPwx8NTw [youtu.be]

For the moment I get this