"Free-air turbulence, k=0.87, q=0.0028." This model was created by stacking the frames of an animation into a 3D set of voxels. The animation was created by Dave Whyte for his "Bees & Bombs" Tumblr. See the 323 project for more details. The animation that created this model is here.
By the way, the photo is real, not a simulation.