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Concentration Command

The Concentration command sets concentration potential 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. Each concentration 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 for (value) and alt time units for (time) (but the units may change depending on the (style) setting).

Be default concentration boundary condition set solvent concentration potential on a node. The (phaseStyle) command can set boundary conditions instead for other diffusion tasks. The options are:

  1. "solvent" (or 1) - solvent diffusion (the default)
  2. "fracture" (or 3) - fracture phase field diffusion
  3. "battery" (or 4) - battery phase field calculations
  4. "conduction" (or 5) - battery conduction equation solved by diffusion

Note that "pressure" (or 2) corresponds to a pore pressure boundary condition, but that should be set instead with a porepressure command.

Notes

  1. The Concentration command can only be in GridBC blocks which are only allowed for MPM analyses.