Comparison of stochastic BGK and FP methods for the simulation of non-equilibrium multi-species molecular gas flows
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
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2025
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| _version_ | 1866929694839930880 |
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| author | Hild, Franziska Pfeiffer, Marcel |
| author_facet | Hild, Franziska Pfeiffer, Marcel |
| contents | Due to limited possibilities of experimental investigations for non-equilibrium gas flows, numerical results are of highest interest. Although the well-established Direct Simulation Monte Carlo (DSMC) method achieves highly accurate solutions, the computational requirements increase excessively for lower Knudsen regimes. Computationally more efficient simulations can be achieved with stochastic continuum-based methods using either the Bhatnagar-Gross-Krook (BGK) or the Fokker-Planck (FP) approximations where, instead of particle collisions, particle relaxation processes are considered. This paper explains the implementation of different stochastic BGK and FP methods in the open-source particle code PICLas for multi-species molecular gas flows. For verification, the results of different test cases are compared. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_18599 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Comparison of stochastic BGK and FP methods for the simulation of non-equilibrium multi-species molecular gas flows Hild, Franziska Pfeiffer, Marcel Computational Physics Fluid Dynamics Due to limited possibilities of experimental investigations for non-equilibrium gas flows, numerical results are of highest interest. Although the well-established Direct Simulation Monte Carlo (DSMC) method achieves highly accurate solutions, the computational requirements increase excessively for lower Knudsen regimes. Computationally more efficient simulations can be achieved with stochastic continuum-based methods using either the Bhatnagar-Gross-Krook (BGK) or the Fokker-Planck (FP) approximations where, instead of particle collisions, particle relaxation processes are considered. This paper explains the implementation of different stochastic BGK and FP methods in the open-source particle code PICLas for multi-species molecular gas flows. For verification, the results of different test cases are compared. |
| title | Comparison of stochastic BGK and FP methods for the simulation of non-equilibrium multi-species molecular gas flows |
| topic | Computational Physics Fluid Dynamics |
| url | https://arxiv.org/abs/2501.18599 |