Abstract: First- and second-order subgrid-scale (SGS) based large-eddy-simulation (LES) turbulent models are very convenient for designing hybrid RANS-LES models and performing Lagrangian particles tracking. Besides the additional subgrid-scale data yielded by those models, they rely on softer hypothesis and should present a larger validity domain than the ones based on pure eddy viscosity formulations. However, they require solving additional equations for SGS quantities.

In this work, we present first- and second-order models implemented in the open-source collocated finite-volume code Code_Saturne, developed by Électricité de France. They have been tested on existing or specifically designed validation cases and compared with experimental data or DNS results. As a first validation step, a new decaying isotropic turbulence case adapted to these new models has been developed to work on both hexahedral and tetrahedral meshes. The models’ near-wall behavior has been investigated with a plane channel flow. Finally, two test cases involving complex physics have been designed and run for further validation: a flow through a 40-deg bent pipe in which Dean vortices are tackled and a buoyancy-aided flow in a periodic circular pipe where the laminarization phenomenon is clearly observed.