Unified Gas-Kinetic Scheme for Unsteady Multiscale Flows with Moving Boundaries
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918439502741504 |
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| author | Zhang, Yue Long, Wenpei Cao, Junzhe Xu, Kun |
| author_facet | Zhang, Yue Long, Wenpei Cao, Junzhe Xu, Kun |
| contents | Simulating multiscale flows with moving boundaries, such as hypersonic multi-body separation and flows in micro-electro-mechanical systems (MEMS), requires robust numerical methods that couple mesh deformation with complex flow physics. This paper presents a hybrid overlapping moving-mesh technique developed within the unified gas-kinetic scheme (UGKS). To mitigate the Courant-Friedrichs-Lewy (CFL) constraint, we extend the implicit unsteady UGKS solver to support moving meshes, incorporating memory-efficient data handling and parallel computing optimizations to maximize computational efficiency. Validated against hypersonic multi-body separation and thermal rarefied MEMS flows, the proposed scheme accurately resolves complex, dynamic multiscale phenomena. The results confirm that this robust and efficient method provides a highly reliable tool for modeling dynamic flow interactions in complex geometric configurations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_09984 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Unified Gas-Kinetic Scheme for Unsteady Multiscale Flows with Moving Boundaries Zhang, Yue Long, Wenpei Cao, Junzhe Xu, Kun Fluid Dynamics Computational Physics Simulating multiscale flows with moving boundaries, such as hypersonic multi-body separation and flows in micro-electro-mechanical systems (MEMS), requires robust numerical methods that couple mesh deformation with complex flow physics. This paper presents a hybrid overlapping moving-mesh technique developed within the unified gas-kinetic scheme (UGKS). To mitigate the Courant-Friedrichs-Lewy (CFL) constraint, we extend the implicit unsteady UGKS solver to support moving meshes, incorporating memory-efficient data handling and parallel computing optimizations to maximize computational efficiency. Validated against hypersonic multi-body separation and thermal rarefied MEMS flows, the proposed scheme accurately resolves complex, dynamic multiscale phenomena. The results confirm that this robust and efficient method provides a highly reliable tool for modeling dynamic flow interactions in complex geometric configurations. |
| title | Unified Gas-Kinetic Scheme for Unsteady Multiscale Flows with Moving Boundaries |
| topic | Fluid Dynamics Computational Physics |
| url | https://arxiv.org/abs/2604.09984 |