Marcel Lesieur (12 July 1945 - 22 March 2022) was a French scientist.
He led a research team at the Geophysical and Industrial Flow Laboratory.
Marcel Lesieur's work focused on turbulence modeling and simulation.
He performed direct numerical simulations of large scales.
His work has been applied to industrial sectors, particularly in subsonic and supersonic aerodynamics, nuclear engineering and meteorology.