add density to bc.regions.fluid too

docs/source/inputs/InputsProblemDefinition.rst

@@ -541,10 +541,10 @@ For a fluid phase, the following inputs can be defined.
 +=====================+=======================================================================+=============+===========+
 | volfrac             | Volume fraction [required]                                            | Real        | None      |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
-| pressure            | Fluid pressure                                                        | Real        | None      |
-+---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | density             | Fluid density                                                         | Real        | None      |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
+| pressure            | Fluid pressure                                                        | Real        | None      |
++---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | temperature         | Fluid temperature                                                     | Real        | None      |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | velocity            | Velocity components                                                   | Reals       | None      |
@@ -688,6 +688,8 @@ For a fluid phase, the following inputs can be defined.
 +=====================+=======================================================================+=============+===========+
 | volfrac             | Volume fraction [required if bc_region_type='mi']                     | Real        | None      |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
+| density             | Fluid density [required if bc_region_type='mi' or 'pi']              | Real        | None      |
++---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | pressure            | Fluid pressure [required if bc_region_type='po' or 'pi']              | Real        | None      |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | temperature         | Fluid temperature [required if bc_region_type='mi' or 'pi']           | Real        | 0.0       |