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P2 Cavity Operator and Riemannian Curved Edge Length Optimization: a Path to High-Order Mesh Adaptation

Abstract : We present a new P 2 extension of the P 1 cavity operator used as the basis for topological modification in 3D metric based mesh adaptation, with notable success in strongly anisotropic industrial cases of CFD. The P 2 operator inherits the P 1 cavity operator's robustness-mesh validity is guaranteed at all times-and manages to recover a metric field's inherent curvature through a Riemannian edge length optimization algorithm. This generic approach allows it to tackle a variety of problems, which are defined only by the input metric field such as the classic problem of surface approximation-through a geometric error surface metric propagated to the volume-or unit mesh construction such as for interpolation error minimization through high-order L p error estimates. Consistence with the log-euclidian metric interpolation scheme used in P 1 adaptation is obtained by a rigorous formulation of the optimization problem. This guarantees full compliance of the operator with the general adaptation process, by accurately measuring Riemannian edge lengths. Particular stress was put on the performance of the operator because of its central role in anisotropic mesh adaptation. All curving operations are carried out locally: this is in opposition with global approaches, be they optimization or PDE based. The optimization itself is carried out by an inhouse solver tailored to the problem at hand. As a result, the added cost is strictly linear. Numerical results illustrating the P 2 cavity operator's ability to recover curvature, be it surface curvature extended to boundary layers or metric field induced curvature of the volume, will be presented through cases representative of real-world geometries encountered in CFD. Finally, the operator's ability to handle rather large cases (10M elements) in minutes will be demonstrated.
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Contributor : Lucien Rochery <>
Submitted on : Tuesday, March 9, 2021 - 2:26:42 PM
Last modification on : Thursday, March 11, 2021 - 9:42:02 PM


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Lucien Rochery, Adrien Loseille. P2 Cavity Operator and Riemannian Curved Edge Length Optimization: a Path to High-Order Mesh Adaptation. AIAA Scitech Forum 2021, Jan 2021, Virtual, United States. ⟨10.2514/6.2021-1781⟩. ⟨hal-03163746⟩



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