Figure 3.

Scherk surface obtained by numerically integrating the reaction-diffusion Brusselator model with A = 4.5, D_X = 2, D_Y = 16, and B = 7.2 in a box of sizes l_x = l_y = 60, l_z = 30. Periodic boundary conditions are applied along x and y while no-flux conditions are imposed in the z direction. To have a better visualization of the saddles region, typical of the Scherk surface, we zoom in on half the system. The representation is then l_x = l_y = l_z = 30 with l_z being on the vertical axis. The drawn isoconcentration surface corresponds to X = 4.5, the concentration of the uniform unstable reference state. The Scherk surface joins two orthogonal sets of three planes, one set being the x = constant planes while the other set is the y = constant planes.