ABSTRACT This study presents a scalable approach for generating large‐scale unstructured meshes efficiently with a multilevel parallelism to overcome bottleneck problems in applications. A multi‐threaded domain decomposition method is developed for generating numerous watertight subdomains on distributed systems. A high‐performance Delaunay mesh kernel for mesh generation and optimization is integrated with an MPI‐based framework designed for dynamic task management and load balancing. The above components are integrated to generate a large‐scale mesh with billions of elements. To testify to the effectiveness of the proposed method, experiments with complicated aerospace models were performed on parallel machines with multiple cores. The running time of domain decomposition and mesh generation was reduced significantly, and more than one hundred billion elements were successfully generated in less than two hours with thousands of cores on supercomputers. The hybrid parallelization demonstrates a pleasant efficiency and scalability of the hybrid parallelization. The results also illustrate the ability to generate billions of high‐quality elements in a more balanced load, and the numerical simulation of large‐scale mesh represents a prominent future for parallel applications in industry.
Wang et al. (2026) studied this question.