This movie shows the fluid kinetic energy of a coupled field-fluid simulation of a first-order phase transition in the early universe. You can read the original paper on the arxiv or at the journal's website.
Movie created using the Cosmos 2 Altix at COSMOS and VisIt.
This website's background is a slice through the 3D box in the movie above (around the 9 second mark), without transparency of course. The kinetic energy density is represented by luminosity, and using GIMP I colourised the resulting greyscale image weighted to the overall website colour scheme.
As the simulation was carried out using periodic boundary conditions, the pattern tiles seamlessly. The initial slice was 1024 pixels square, which I scaled down to 800 in order to reduce the overall image file size without unduly sacrificing quality. On a typical monitor the repeat may be noticeable but as much of the plot is covered by this text it should not be too obtrusive.
Q-ball decay in the Hartree approximation
Movie created using VisIt.
't Hooft-Polyakov monopole formation
Movie created using the Universe Altix at COSMOS and Vapor.