Used Houdini to create and then process the clouds, there are no simulations envolved here, only velocity vectors manipulating advection.
Rendered with Octane Render in Cinema 4D. Airship model from Kitbash 3D
If you want to use these images please check out my artgrab where I post images that you can exclusively license to use as you please!
https://artgrab.co/art/teixynamics/283903