Study how order parameters change with increasing bands. The simulations are performed on a serials of rectangle domains with fixed Ly but incresing Ly.
Calculate sample-averaged susceptibility for varied epsilon at given system size, where we can estimate the susceptibility peak chi_m and location epsilon_m. The given system size can be regarded as the correlation length at epsilon_m.
Meanwhile, we can evaluate the correlation length form decaying of order parameters or spatial correlation functions.
Calculate 2d spatial correlatin function of density and velocity.
Before reaches the steady state, it is of interest to study ordering dynamics.