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for diffusion between two domains. Adds a non-reactive internal interface modeling Fickian diffusive mass transfer across a stagnant film of finite thickness between two finite volume domains.
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Summary
Adds
FickDiffusionInternalInterface, a non-reactive internal interface that models Fickian diffusive mass transferacross a stagnant film of finite thickness between two finite-volume domains.
Motivation
The existing
ConstantReservoirDiffusioncouples a single domain to a constant-composition reservoir.The reservoir cannot represent a finite bulk phase that accumulates products or depletes reactants with time.
FickDiffusionInternalInterfaceconnects two domains that each carry their own state, so species diffuse betweenthem with mass conserved across the interface.
Testing
Adds a unit test simulating an inert, dilute O2 tracer diffusing between two liquid n-octane volumes at 298 K (reuses
liquid_phase.rms).Checks mass conservation, the exponential relaxation of the concentration difference, and equilibrium concentrations.