[ff3d-users] Specifying Initial Conditions

[Rogers, Carl Edward]

I'm new to FF3D so this may be a simple-minded question:

I'm trying to set up the 3 dimensional heat equation dC/dt = d/dx(D*dC/dx) 
where x is the position vector. I've basically tried to set it up as Arun 
Viswanathan did in his posts entitled "Code to solve Fick's law, what's 
wrong?". My question is that Arun specified his initial concentration C0 as a 
continuous function C0=x*y*z. Is it possible in FF3D to discretely intialize 
each element? I'd like to set up a uniform concentration and then specify a 
small region in the center as having 0 concentration. By solving the time 
iterations I'd be tracking the transient diffusion of the concentration into 
the region. Any help would be greatly appreciated!

Carl

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Rogers, Carl Edward
Vanderbilt University
Email: address@hidden