3D URANS computation with elsA solver (http://elsa.onera.fr).
The square building is modelled by IBC (immersed boundary conditions) in the simulation.
Part of Garteur AG22 project (http://www.garteur.org/Helicopters.html)
Publication: "Experimental and numerical investigation of the aerodynamic interactions between a hovering helicopter and surrounding obstacles", Q. Gallas, R. Boisard, JC. Monnier, J. Privost, A. Gilliot, ERF2017, 12-15 septembre 2017, Milan, Italy