Runge-Kutta solutions of a hyperbolic conservation law with source term

Spurious long-term solutions of a finite-difference method for a hyperbolic conservation law with a general nonlinear source term are studied. Results are contrasted with those that have been established for nonlinear ordinar y differential equations. Various types of spurious behavior are examined, including spatially uniform equilibria that exist for arbitrarily small tim e-steps, nonsmooth steady states with profiles that jump between fixed leve ls, and solutions with oscillations that arise from nonnormality and exist only in finite precision arithmetic. It appears that spurious behavior is a ssociated in general with insufficient spatial resolution. The potential fo r curbing spuriosity by using adaptivity in space or time is also considere d.