ABSTRACT _In this paper the OpenFOAM based fully coupled algorithm for the resolution of compressible flows at all speed with emphasis on Turbomachinery applications is presented. The pressure-velocity coupling at the heart of the Navier-Stokes equations is resolved by deriving a pressure equation in similar fashion to what is done in the segregated SIMPLE algorithm but with an implicit treatment of the velocity field, also the pressure gradient in the momentum equations is treated implicitly. The resulting extended system of equations, that comprises the coefficients of the discretized momentum and pressure equations along with their inter-coupling, is solved using an algebraic multigrid solver. All of the above numerics have been implemented within OpenFOAM , an open source code framework that is used for the solution of industrial scale flow problems._ The OpenFOAM-based coupled solver is validated using experimental and numerical data available from reference literature test cases as well as with a segregated solver based on the SIMPLE algorithm. Then its performance is evaluated in a range of industrial cases. Results clearly indicate substantial improvements in terms of computational cost and robustness.