Navier-Stokes fluid simulation explained with Godot game engine

Navier-Stokes fluid simulation explained with Godot game engine(myzopotamia.dev)

35 points by myzek 3 days ago | 6 comments

myzek 3 days ago |

So once upon a time I stumbled upon simulating fluids in gamedev and I really wanted to learn how it works. Fast forward 2 months and I decided to write down everything I learned to hopefully make it easier for others in the future!

magicalhippo 3 days ago | |

Fluid sims are just so darn fun! Nice writeup, very accessible.

Couple of notes, I think you forgot to apply timestep when adding rocket exhaust velocity, pretty sure it should be

  u[idx] += backward.x * flame_velocity_amount * falloff * delta
  v[idx] += backward.y * flame_velocity_amount * falloff * delta

You need to compensate by scaling up flame_velocity_amount, I used 85, seemed about the same.

myzek 3 days ago | | |

Yeah it seems I missed that, adding the rocket at the end was a cherry on the top and I was so exhausted already I'm surprised it even works lol

nick__m 48 minutes ago | |

excellent article, great vulgarisation and human written !

Thank you

frankdlc222 3 days ago |

This is really cool. I love how much detail you went into explaining the setup and walking through each piece of the simulation. Definitely bookmarking this to play around with later!