Topical issue on Multi-scale phenomena in complex flows and flowing matter Alessandra S. Lanotte, Massimo Cencini, Mauro Sbragaglia and Luca Biferale Eur. Phys. J. E, 39 5 (2016) 56 Published online: 27 May 2016 DOI: 10.1140/epje/i2016-16056-y