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materi_diffusion

The artificial diffusion $c$ is added to the node_dof records. It can be used in combination with materi_diffusion_minimum to decide in an eulerian calculation where material is present and where not. Initially set $c$ to 0 at places where no material is present, and set it to 1 at places where material is present. The initialization needs to be done in the node_dof records.

The redistribution of diffusion is governed by the conservation law


\begin{displaymath}
\dot{c} + \frac{\partial c v_j}{\partial x_j} = 0
\end{displaymath}

where $v_j$ is the velocity in the direction of the space coordinate $x_j$. Condition: the -materi differential group_type should be present.



root 2001-07-22