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idaholab / blackbear

BlackBear is a MOOSE-based code for simulating degradation processes in concrete and other structural materials.
GNU Lesser General Public License v2.1
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Add version of ConcreteMoistureTimeIntegration with mass lumping to minimize oscillations #327

Closed bwspenc closed 1 year ago

bwspenc commented 1 year ago

Reason

Mass lumping is an accepted procedure to minimize oscillatory behavior in the presence of sharp concentration fronts (see https://mooseframework.inl.gov/modules/porous_flow/mass_lumping.html). This behavior is sometimes observed in the moisture solution for concrete, and it is expected that it will benefit from mass lumping.

Design

Add a new version of this kernel that derives from MassLumpedTimeDerivative.

Impact

This will only add new features. We may want to deprecate the non-lumped version of this at some point.

bwspenc commented 1 year ago

Solution of the relative humidity profile in the BlackBear maqbeth regression test without mass lumping: rh_plot_orig.pdf with mass lumping: rh_plot.pdf