2d Problems# 2D single-species reaction diffusion 2D Burgers (Periodic BCs) 2D Gray Scott reaction-diffusion 2D Shallow water equations 2D Euler Smooth 2D Euler Kelvin-Helmholtz 2D Euler Sedov Full 2D Euler Sedov (with symmetry) 2D Euler Riemann 2D Euler Normal Shock 2D Euler Double Mach Reflection