SUMMARYPresently, improving the accuracy and reducing computational costs are still two major CFD objectives often considered incompatible. This paper proposes to solve this dilemma by developing an adaptive mesh reÿnement method in order to integrate the 3D Euler and Navier-Stokes equations on structured meshes, where a local multigrid method is used to accelerate convergence for steady compressible ows. The time integration method is a LU-SGS method (AIAA J 1988; 26:1025-1026) associated with a spatial Jameson-type scheme (Numerical solutions of the Euler equations by ÿnite volume methods using Runge-Kutta time-stepping schemes. AIAA Paper, 81-1259Paper, 81- , 1981. Computations of turbulent ows are handled by the standard k-! model of Wilcox (AIAA J 1994; 32:247-255). A coarse grid correction, based on composite residuals, has been devised in order to enforce the coupling between the di erent grid levels and to accelerate the convergence. The e ciency of the method is evaluated on standard 2D and 3D aerodynamic conÿgurations.