This article deals with the description and the validation of the unstructured viscous RANS flow solver Wolf and its compliance with anisotropic unstructured mesh adaptation. We first describe the numerical scheme of the flow solver and its validation on standard test cases. We then give a general description of the mesh generator and its main features for viscous mesh generation and adaptation. From these points, we define some simple strategies to perform adaptive computation for RANS solutions. Each technique is illus-trated with a numerical example and we discuss its robustness, effectiveness and ability to handle complex geometries.