Hybrid Block-Structured Grids for Complex Ocean Domains

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Stahl, Julian ; Schmalfuß, Jonathan ; Aizinger, Vadym ; Grosso, Roberto:
Hybrid Block-Structured Grids for Complex Ocean Domains.
In: Proceedings of the 2026 SIAM International Meshing Roundtable. - Philadelphia, USA , 2026 . - S. 203-216
DOI: https://doi.org/10.1137/1.9781611979138.16

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Abstract

We propose a new method to automatically generate hybrid block-structured grids (hBSG) for complex ocean domains suited for numerical simulations. hBSGs may contain structured or unstructured blocks. They combine the performance benefits of block-structured grids with the ability of unstructured grids to control the local resolution and accurately represent the domain geometry. We discuss three different approaches to determine the placement of structured and unstructured grid blocks. The mesh generation schemes are optimized to guarantee element quality, thereby ensuring numerical stability, while also providing local resolution in accordance with the physical properties of the flow system, thereby minimizing the CFL restrictions on the time step. We evaluate and compare the quality of the meshes with previous methods and show that the performance benefits offered by hBSGs are comparable to those of standard block-structured grids.