Computer simulation of vortex combustion processes in fire-tube boilers Sergei A. Khaustov, Alexander S. Zavorin, Konstantin V. Buvakov, Lidiya D. Kudryashova and Anastasiya V. Tshelkunova EPJ Web of Conferences, 82 (2015) 01041 Published online: 20 January 2015 DOI: 10.1051/epjconf/20158201041