Re: [ff3d-users] Some questions..

[Stephane Del Pino]

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Le lundi 10 Mai 2004 20:56, address@hidden a écrit :
> Hello everybody,
>
> As usual I have some questions about ff3d programming... :) I am trying to
> simulate some models from semiconductor physics but I have some problems..
> How can I insert in a code expressions like the following? (In the
> following expressions n is the variable I am trying to evaluate)
>
> 1)   div.(grad(log(n)) = something
You have to solve div(grad(u)) = something
and then set n=exp(u).

> 2) div.(grad(n)+ (d^2 n)/(dx dy) = 0  (where d^2 is a partial derivative)
You have to use the syntax dx(dy(n)).

> 3) div(grad(n)) + dn/dx = 0 (where dn/dx is a partial derivative)
And here dx(n).

Best regards,
Stephane.
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