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A closed advancing-layer method for generating curved boundary layer mesh

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Abstract

A closed advancing-layer method for generating high-order (P2) high-aspect-ratio elements in the boundary layer (BL) region is presented. This approach efficiently and naturally produces a smooth anisotropic blending between colliding BL fronts. It is also able to guarantee mesh generation validity and quality prior to mesh modifications. In additions, it provides a robust strategy to couple unstructured anisotropic mesh adaptation and high-aspect-ratio element pseudo-structured BL meshes. Contrary to classical high-order approaches that deform an existing linear BL mesh into a curved BL mesh, the proposed check validity and quality of the high-order elements prior to including them in the BL mesh. In the same manner the mesh deformation approach for including the BL mesh in the overall mesh allows checking of validity and quality of the outer region high-order elements. This approach utilizes a recently developed connectivity-change based P2 moving mesh strategy for deforming the curved volume mesh as the BL is inflated. In regards to the high-order BL mesh generation, it features state-of-art capabilities, including ; optimal normal evaluation, normal smoothing, blended BL termination, mixed-elements BL, varying growth rate, and BL imprinting on curved surfaces. First results obtained on simple geometries are presented to assess the proposed strategy.
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Dates and versions

hal-02345334 , version 1 (04-11-2019)

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Rémi Feuillet, David Marcum, Frédéric Alauzet. A closed advancing-layer method for generating curved boundary layer mesh. AIAA Aviation 2019 Forum, Jun 2019, Dallas, TX, United States. ⟨10.2514/6.2019-3675⟩. ⟨hal-02345334⟩
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