I am getting an error "Spatial discretization has failed" while solving a 1D pde using pdepe for spherical coordinates

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Sagar Dhuri
Sagar Dhuri 2017-7-3
编辑： Sagar Dhuri 2017-7-3
I want to solve a pde for diffusion of species inside a spherical bacterial cell from its SURFACE.
The boundary conditions are as below: at r=0, dC/dr=0 for all t>0; and at r=R, C=1200 for all t>0; [--> **No convection from outside environment to the cell surface is involved, only diffusion is taking place from the cell surface to the inside of the cell]
I have written Boundary conditon as below for pdepe:
function [pl,ql,pr,qr] = PDEBC(xl,ul,xr,ur,t)
global K Ce De D
pl = 0;
ql = 1;
pr = (ur-1200);
qr = 0;
Following error occurs: Spatial discretization has failed
However, everything goes fine if I take convective and diffusive transport together into consideration, with BC: @ r=R, DdC/dr=K(C-1200)
I request the community to please help me.
Thanks in advance.

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