Improvement of Unstructured Computational Fluid Dynamics Simulations Through Novel Mesh Generation Methodologies

On the basis of the DLR, German Aerospace Center contribution to the fourth AIAA Drag Prediction Workshop, a procedure is documented to produce an unstructured grid family as self-similar as possible, with a specific procedure for steering the near-field advancing-layer process. A novel hybrid mesh generation approach is presented, in which adjoint-based dissipation error evaluations are successfully employed to improve the solution accuracy for specific conditions. An intrinsic deficit of the standard mesh generation procedure results in an unsatisfying resolution of flow features at the wing body junction. For this case, a solution strategy based on chimera grids is tested and found to improve the aerodynamic evaluation.