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From: ALOK GAUTAM on 8 Jun 2010 21:45
Dear Friends,

I am trying to solve nonlinear partial differential equation using PDETOOL box.

But I am not able to feed Neumann boundary condition.

If any one knows how to feed Neumann boundary condition please help me for that.

My pde is –div(c*grad(u))+a*u=f

c=-1./sqrt(1+ux.^2+uy.^2)
a=-1
f=0

my boundary condition

du/dn=1.7321

when I use feed my boundary condition in PDEtool box

n*c*grad(u)+qu=g

g=1.7321

c is problem for me, in my case c=1 for boundary condition but in pde it is c=-1./sqrt(1+ux.^2+uy.^2)


Thanks in advance

Alok
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