The Ability of Anisotropic Mesh Adaptation to Capture Complex Physics on a Transonic Tandem Compressor

This paper shows the ability of metric-based anisotropic mesh adaptation to accurately capture flow features on a common complex test case the TUDa-GLR-OpenStage : a transonic compressor with variable stator vane in tandem arrangement. This case involves several rows interaction, it has one rotor, one stator and one outlet guided vane (OGV). Two aspects have to be taken into account to extend mesh adaptation for such multi-row configurations. First, the rotor-stator and the stator-OGV interactions are modeled with mixing plane boundary condition technique as it removes the dependency of the results on the relative position between the rotor and the stator, and allows the use of steady simulation. A new mixing plane numerical scheme is developed to deal with unstructured meshes. Secondly, the mesh adaptation error estimate is extended to equidistribute the error over all the rows of the machine to achieve a consistent mesh adaptation process. The proposed methodology is validated on the TUDa-GLR-OpenStage for which a detailed numerical analysis is given.