This work presents the development of a model-chain for the simulation of Atmospheric Boundary Layer flows through an open-science approach. The presentation introduces the different stages of the open-science methodology which starts with the release of the open-source CFD code and the open-access validation data developed throughout the NEWA project. It also contains the open-access publications and description of the scripts employed for the comparison with the measurements so that it can serve as a case example for other model developments, and to the wind energy industry as a platform for validation & verification procedures for current and potentially new tools.