So when you visualize the solution, the error is at the boundary but it
looks
correct in the interior?
Yes, it is. Thereafter, the error at boundaries does propagate and then
interfere with the interior.
From the pictures you posted in a follow-up, it looks like the boundary
values are actually correct, but that the problem starts one layer of cells
into the domain. Do I see this correctly?
> Is there a simple way to update the RHS of old value using something
simple
> like vmult?
What is the equation you are trying to implement?
I am trying just the Heat equation,
rho * C * dT/dt = nabla *(kappba nalbaT) + f(x,y,t);
Boundary condition is,
T(x,y,z,t) = 300K, at boundaries.
I meant the "update the RHS of old value" equation.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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