--- res: bibo_abstract: - We investigate the dynamics of ferrofluidic wavy vortex flows in the counter-rotating Taylor-Couette system, with a focus on wavy flows with a mixture of the dominant azimuthal modes. Without external magnetic field flows are stable and pro-grade with respect to the rotation of the inner cylinder. More complex behaviors can arise when an axial or a transverse magnetic field is applied. Depending on the direction and strength of the field, multi-stable wavy states and bifurcations can occur. We uncover the phenomenon of flow pattern reversal as the strength of the magnetic field is increased through a critical value. In between the regimes of pro-grade and retrograde flow rotations, standing waves with zero angular velocities can emerge. A striking finding is that, under a transverse magnetic field, a second reversal in the flow pattern direction can occur, where the flow pattern evolves into pro-grade rotation again from a retrograde state. Flow reversal is relevant to intriguing phenomena in nature such as geomagnetic reversal. Our results suggest that, in ferrofluids, flow pattern reversal can be induced by varying a magnetic field in a controlled manner, which can be realized in laboratory experiments with potential applications in the development of modern fluid devices.@eng bibo_authorlist: - foaf_Person: foaf_givenName: Sebastian foaf_name: Altmeyer, Sebastian foaf_surname: Altmeyer foaf_workInfoHomepage: http://www.librecat.org/personId=2EE67FDC-F248-11E8-B48F-1D18A9856A87 orcid: 0000-0001-5964-0203 - foaf_Person: foaf_givenName: Younghae foaf_name: Do, Younghae foaf_surname: Do - foaf_Person: foaf_givenName: Ying foaf_name: Lai, Ying foaf_surname: Lai bibo_doi: 10.1038/srep18589 bibo_volume: 5 dct_date: 2015^xs_gYear dct_language: eng dct_publisher: Nature Publishing Group@ dct_title: Magnetic field induced flow pattern reversal in a ferrofluidic Taylor-Couette system@ ...