Main Help → All Commands → Diffusion Calculations / MPM Boundary Conditions → Concentration
The Concentration
command sets concentration potential or transport value conditions to all nodes selected by the GridBC command that encloses it:
Concentration (style),(value),<(time)>,<(phaseStyle)>
where (style)
specifies the style of the applied concentration potential or transport value. Each condition depends on two parameters specified by arguments (value)
and (time)
. If either argument is not supplied, they are set to zero. The standard units are dimensionless concentration potential or transport value for (value)
and alt time units for (time)
(but the units may change depending on the (style)
setting).
By default, Concentration
command set solvent concentration potential on a node. The (phaseStyle)
command can set boundary conditions instead for other transport tasks. The options are:
Note that "pressure" (or 2) corresponds to a pore pressure boundary condition, but that should be set instead with a PorePressure command.
Concentration
command can only be in GridBC blocks which are only allowed for MPM analyses.