This animation was simulated in a fluid simulation program that I am writing. The program outputs a triangle mesh for each simulated frame which is then imported into Blender and rendered using Cycles.
Simulation visualization was rendered in Blender.
Simulation Details:
Frames 384 (30fps)
Simulation time 30 hours
Render time 103 hours (125 samples)
Total time 133 hours
Simulation resolution 256 x 128 x 256
Peak # of fluid particles 29.5 Million
Peak # of diffuse particles 8 Million
Peak RAM usage 1.7 GB
Mesh bake file size 2.65 GB
Particle bake file size 21 GB
Total bake file size 23.65 GB
Computer specs: ultrabook style laptop with Intel Core i5-4200U @ 1.60GHz processor, integrated Intel HD4400 graphics chip, and 8GB RAM.
Source Code: https://github.com/rlguy/GridFluidSim3D