Stress and flux reconstruction in Biot's poro-elasticity problem with application to a posteriori error analysis

We derive equilibrated reconstructions of the Darcy velocity and of the total stress tensor for Biots poro-elasticity problem. Both reconstructions are obtained from mixed finite element solutions of local Neumann problems posed over patches of elements around mesh vertices. The Darcy velocity is reconstructed using RaviartThomas finite elements and the stress tensor using ArnoldWinther finite elements so that the reconstructed stress tensor is symmetric. Both reconstructions have continuous normal component across mesh interfaces. Using these reconstructions, we derive a posteriori error estimators for Biots poro-elasticity problem, and we devise an adaptive spacetime algorithm driven by these estimators. The algorithm is illustrated on test cases with analytical solution, on the quarter five-spot problem, and on an industrial test case simulating the excavation of two galleries.

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