A Qualitative Study on the Effects of Mesh Guideline Modification for Unstructured Mesh Generation of the NASA High Lift Common Research Model (HL-CRM)

Abstract

As part of the 1 st Geometry and Mesh Generation Workshop, unstructured tetrahedral and unstructured hybrid Computational Fluid Dynamics meshes were generated according to the meshing guidelines supplied by the 3 rd High Lift Prediction Workshop. During this process, it was noted that application of some meshing guidelines became a bottleneck in the process and negatively impacted the quality of the meshes. A study is performed to compare the FUN3D simulation from the baseline medium-resolution workshop unstructured mesh with those on meshes resulting from guideline variations to the baseline. Recommendations on the elimination or reduction of meshing guidelines for high lift aerodynamic cases like the High Lift Common Research Model are based on the resulting data. Nomenclature C L lift coefficient M Mach number R e Reynolds number Symbols α angle of attack O asymptotic algorithm complexity, i.e., big O notation

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“…A grid independent test (GIT) was performed to ensure negligible numerical error due to mesh density. Insufficient element numbers and poor-quality mesh would affect the reliability of simulated results and face slow convergence scenarios during simulation [27]. Five different sets of mesh densities starting from 1.5 million elements up to 24 million elements were used to conduct the GIT.…”