Question: Newton iteration is not converging

August 07 2014 wo0olf 20
Maple
0

hi 

what is problem ?

 


pde := u(x, y)*(diff(u(x, y), x)) = .108/(x^2/(0.625e-1)+0.25e-4)^2-609224*10^(-7)/(x^2/(0.625e-1)+0.25e-4)^3+(diff(u(x, y), y, y))*10^(-6)

u(x, y)*(diff(u(x, y), x)) = .108/(16.00000000*x^2+0.25e-4)^2-(76153/1250000)/(16.00000000*x^2+0.25e-4)^3+(1/1000000)*(diff(diff(u(x, y), y), y))

(1)

sol := pdsolve(pde, {u(0, y) = 18, u(x, 0) = 0.6e-3, u(x, 0.25e-4) = 18}, numeric)

module () local INFO; export plot, plot3d, animate, value, settings; option `Copyright (c) 2001 by Waterloo Maple Inc. All rights reserved.`; end module

(2)

sol:-plot3d(x = 0 .. 0.175e-1)

Error, (in pdsolve/numeric/plot3d) unable to compute solution for x>HFloat(0.0):
Newton iteration is not converging

 

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