Stochastic Lagrangian method for downscaling problems in computational fluid dynamics Frédéric Bernardin, Mireille Bossy, Claire Chauvin, Jean-François Jabir and Antoine Rousseau ESAIM: M2AN, 44 5 (2010) 885-920 Published online: 26 August 2010 DOI: 10.1051/m2an/2010046