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Next: Albedos Up: Boundary conditions Previous: Extrapolation   Contents   Index

Zero flux

In the second case we treat the surrounding media (the reflector) as a part of the core, ie as a part of the region in which a solution is sought. In every physically realistic computation of the fluxes it is reasonable to assume a zero flux condition [1, p. 126] on the surface of the reflector (specified by $\hspace{0.2ex}\underline{R}{}\hspace{0.15ex}_{refl}(s)$), ie we choose a pure Dirichlet boundary condition of the form

\begin{displaymath}
\phi(\hspace{0.2ex}\underline{r}{}\hspace{0.15ex}) = 0, \qu...
...0.15ex}=\hspace{0.2ex}\underline{R}{}\hspace{0.15ex}_{refl}(s)
\end{displaymath} (1.9)

This form of boundary condition gives rise to a problem, however, because the inclusion of the reflector implies knowledge of group constants (see page [*]) for the reflector material. These constants are not only dependent on the reflector material itself but also depend on the composition of the core1.7.

 
 

 
 
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