iTurbo vs MaxwellsDemon

This application performs a Direct Numerical Simulation (DNS) where the Navier-Stokes equations are solved for two dimensional incompressible homogeneous turbulence. These equations are a set of nonlinear partial differential equations. The time stepping is performed with a simple Euler method where the time step is calculated so that the CFL number does not exceeds the given number (should be less than 0.8 otherwise the simulation blows up). The equations are solved in the Fourier space where the calculation of the nonlinear term transforms to a simple multiplication. The main CPU usage is consumed by transforming the vorticity field back and fourth between the Normal space where the time-stepping is performed and the Fourier space where the nonlinear term is calculated.

You can learn the essence of statistical thermodynamics. Through simulation of gas molecular motion, you can intuitively understand basic concepts such as molecular kinetic energy, temperature, and entropy. Prepare a hot gas and a cold gas separated by a wall. Remove the wall and mix the two gases. Then, place the wall, which is covered with Maxwell's demon, in the center of the container, again dividing the container in two. What will happen?