The density
is added to the node_dof records.
Now this density is used in the equations,
and the data item record materi_density in the data part
needs not to be specified.
The density is governed by the mass conservation law
where
is the velocity in the direction of the
space coordinate
.
Don't forget to initialize the density by specifying node_dof
records.
Condition: the -materi differential group_type should be present.
And see also group_materi_density_minimum.