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CLAWPACK is a software package designed to compute numerical solutions to hyperbolic partial differe

claw/clawpack/2d/example2

This directory contains an example driver routine for solving the 2D
scalar equation $u_t + (u^2)_x + (u^4)_y = 0$ as an illustration of how the
Riemann solvers rpn2 and rpt2 can be set for a nonlinear problem.