Fluid boundary conditions in kinetic-diffusion Monte Carlo
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911138257567744 |
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| author | Steel, Thijs Maes, Vince Samaey, Giovanni |
| author_facet | Steel, Thijs Maes, Vince Samaey, Giovanni |
| contents | The Kinetic-Diffusion Monte Carlo (KDMC) method is a powerful tool for simulating neutral particles in fusion reactors. It is a hybrid fluid-kinetic method that is significantly faster than pure kinetic methods at the cost of a small bias due to fluid approximations. Unfortunately, when simulating particles close to a boundary, it needs to switch to a purely kinetic method, which is significantly slower. In this paper, we will extend the method so that it can accurately take boundary conditions into account without switching to a purely kinetic method. Experiments show that this extension can lead to a speedup of up to 500 times compared to a KDMC method that switches to a purely kinetic method, while not sacrificing too much accuracy. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_03942 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fluid boundary conditions in kinetic-diffusion Monte Carlo Steel, Thijs Maes, Vince Samaey, Giovanni Numerical Analysis 65M75 G.1.8 The Kinetic-Diffusion Monte Carlo (KDMC) method is a powerful tool for simulating neutral particles in fusion reactors. It is a hybrid fluid-kinetic method that is significantly faster than pure kinetic methods at the cost of a small bias due to fluid approximations. Unfortunately, when simulating particles close to a boundary, it needs to switch to a purely kinetic method, which is significantly slower. In this paper, we will extend the method so that it can accurately take boundary conditions into account without switching to a purely kinetic method. Experiments show that this extension can lead to a speedup of up to 500 times compared to a KDMC method that switches to a purely kinetic method, while not sacrificing too much accuracy. |
| title | Fluid boundary conditions in kinetic-diffusion Monte Carlo |
| topic | Numerical Analysis 65M75 G.1.8 |
| url | https://arxiv.org/abs/2509.03942 |