OpenVDB:

The archive contains 10 folders, each with a .vdb sequence of 300 frames. These animated sequences can be loaded as volumes in any 3D package that supports OpenVDB. The VDB sequences have been resampled to reduce vertex count, improving performance and enabling use on lower-end setups, with each frame containing between 500k to 1M vertices. The VDB sequences only include a density attribute. For shading, use density for density, and remapped inverted density for emission strength and color. A color ramp helps control inputs. In Blender, use the provided shader presets with the VDBs to save time.