# Lax-Wendroff solve hyperbolic equations

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 July 14, 2003, 04:53 Lax-Wendroff solve hyperbolic equations #1 zyf Guest   Posts: n/a I'm trying to solve a standard hyperbolic equations with lax-wendroff method, but after two thousand timesteps, got divergence result. I'm not sure if the BC manipulation is right. du/dt+a*dv/dz=0 dv/dt+a*du/dz=0 with a=5000.here 'u' is velocity, 'v' is stress. t:[0,nt] z:[0,nz] set B.C.:at point z=0, u=0 at point z=nz, v=0 I.C.: u=0;v=0;except at point uz=nz/2, u=1. difference with Lax-Wendroff method. because 'a=5000', so set 'dt/dz=1e-4' to stablize L-W method. at boudnary set u(-1,t)=-u(1,t) v(-1,t)=2*v(0,t)-v(1,t) u(nz+1,t)=2*u(nz,t)-u(nz-1,t) v(nz+1,t)=-v(nz-1,t) does the boudnary setting right? thanks . Zyf

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