diff --git a/docs/source/methods/geometry.rst b/docs/source/methods/geometry.rst index 4e90dd992..93dec2df4 100644 --- a/docs/source/methods/geometry.rst +++ b/docs/source/methods/geometry.rst @@ -617,6 +617,10 @@ condition has been applied, the particle is killed and any surface current tallies are scored to as needed. If a reflective boundary condition has been applied to the surface, surface current tallies are scored to and then the particle's direction is changed according to the procedure in :ref:`reflection`. +Note that the white boundary condition can be considered as the speciall case of +reflective boundary condition, where the same processing method will be applied to +deal with the surface current tallies scoring, except for determining the +changes of particle's direction according to the procedures in :ref:`white`. Next, we need to determine what cell is beyond the surface in the direction of travel of the particle so that we can evaluate cross sections based on its @@ -892,6 +896,13 @@ Dxy + Eyz + Fxz + Gx + Hy + Jz + K = 0`. Thus, the gradient to the surface is \\ 2Cz + Ey + Fx + J \end{array} \right ). +.. _white: + +------------------------------ +White Boundary Conditions +------------------------------ + + .. _constructive solid geometry: http://en.wikipedia.org/wiki/Constructive_solid_geometry .. _surfaces: http://en.wikipedia.org/wiki/Surface .. _MCNP: http://mcnp.lanl.gov