Robust moving-mesh algorithms for hybrid stretched meshes : application to moving boundaries problems

摘要

A robust Mesh-Mover Algorithm (MMA) approach is designed to adapt meshes of moving boundaries problems. A new methodology is developed from the best combination of wellknown algorithms in order to preserve the quality of initial meshes.ududIn most situations, known MMAs distribute mesh deformation while preserving a good mesh quality. However, invalid meshes are generated when the motion is complex and/or involves multiple bodies. After studying few MMAs limitations, we propose the following approach: use the Inverse Distance Weighting (IDW) function to produce the displacements field, then the Geometric Element Transformation Method (GETMe) smoothing algorithms to improve the resulting mesh quality and use an untangler to revert negative elements.ududThe proposed approach has been proven efficient to adapt meshes for various realistic aerodynamic motions: a symmetric wing has suffered large tip bending and twisting and the high-lift components of two wings (one rectangular and one swept) have moved to different flight stages.ududFinally, the fluid flow has been solved on adapted meshes and their results are close to experimental ones. However, for situations where moving boundaries are close to contact more improvements need to be made or other approaches should be considered such as the overset grid method.