Problems with NDSolve

*To*: mathgroup at smc.vnet.net*Subject*: [mg5991] Problems with NDSolve*From*: lichtner at swri.edu*Date*: Sat, 8 Feb 1997 22:38:09 -0500*Organization*: Southwest Research Institute*Sender*: owner-wri-mathgroup at wolfram.com

I'm having problems with using NDSolve to solve partial differential equations. Has anyone had any luck with with?? I tried a very simple heat conduction equation as a test with constant initial temperature and constant temperature at the left face, and a zero flux boundary condition at the right face: soln =NDSolve[{D[y[x,t], t] == D[y[x,t], x, x], y[0,t]==1, y[x,0]==0, Derivative[1,0][y][5,t]==0}, y[x,t], {x,0,5}, {t,0,10}] I get a strange warning message: NDSolve::"ibcinc": "Warning: Boundary and initial conditions are inconsistent." And after plotting the results with Plot3D[Evaluate[y[x,t] /. First[soln]], {x,0,5}, {t,0,10},PlotPoints->30] get just a flat surface with nothing happening! Thanks for any help. ...Peter __________________________________________________________________ Peter C. Lichtner <lichtner at swri.edu> Southwest Research Institute http://www.swri.edu/ Center for Nuclear Waste Regulatory Analyses (CNWRA) 6220 Culebra Road San Antonio, Texas 78238-5166 Telephone: Work: (210) 522-6084 <<NeXTMail Welcome!!!>> Fax: (210) 522-6081 Home: (210) 490-8258 __________________________________________________________________