  We present computer simulations of the response of a flexoelectric blue phase
network, either in bulk or under confinement, to an applied field. We find a
transition in the bulk between the blue phase I disclination network and a
parallel array of disclinations along the direction of the applied field. Upon
switching off the field, the system is unable to reconstruct the original blue
phase but gets stuck in a metastable phase. Blue phase II is comparatively much
less affected by the field. In confined samples, the anchoring at the walls and
the geometry of the device lead to the stabilisation of further structures,
including field-aligned disclination loops, splayed nematic patterns, and yet
more metastable states. Our results are relevant to the understanding of the
switching dynamics for a class of new, "superstable", blue phases which are
composed of bimesogenic liquid crystals, as these materials combine anomalously
large flexoelectric coefficients, and low or near-zero dielectric anisotropy.
