| Citation: | Wang Yi, Wang Xuede. Three-dimensional N-S/DSMC coupling algorithm for arbitrary-grid types[J]. Journal of Aerospace Power, 2026, 42（X）：20260248 doi: 10.13224/j.cnki.jasp.20260248
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To address the limitation of continuum/rarefied-flow coupling methods in handling multiple grid types, a three-dimensional Navier-Stokes (N-S)/Direct Simulation Monte Carlo (DSMC) coupling framework for arbitrary grid types was developed. A linked-list data structure was adopted to uniformly describe different grid topologies and face-adjacency relations in the continuum and rarefied regions. Based on the face-cell adjacency information, a molecular cell-to-cell migration search algorithm was developed by combining an oriented-volume criterion based on the divergence theorem with a line segment-triangle intersection method. The local Knudsen number was employed as the continuum breakdown criterion to automatically partition the N-S and DSMC regions and generate complex three-dimensional coupling interfaces. Bidirectional information transfer was realized by generating one or multiple layers of information-transfer cells on both sides of the interface and applying the boundary-state method. Hypersonic flow over a sphere was simulated using tetrahedral, hexahedral, and hybrid grids. The results showed that, compared with full-domain DSMC simulations, the computational time was reduced by 45.6% for tetrahedral grids, 39.8% for hybrid grids, and 33.7% for hexahedral grids. The wall pressure coefficient and heat flux obtained with the three grid types agreed well with the reference DSMC results. These results indicate that the proposed method has good computational efficiency and adaptability to different grid types.
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