  Pressure oscillations at small time steps have been known to be an issue in
poroelasticity simulations. A review of proposed approaches to overcome this
problem is presented. Critical time steps are specified to alleviate this in
finite element analyses. We present a mixed isogeometric formulation here with
a view to assessing the results at very small time steps. Numerical studies are
performed on Terzaghi's problem and consolidation of a layered porous medium
with a very low permeability layer for varying polynomial degrees, continuities
across knot spans and spatial discretizations. Comparisons are made with equal
order simulations.
