Ghost-Mode Filtered Fluctuating Lattice Boltzmann Method
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914238236196864 |
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| author | Lauricella, Marco Montessori, Andrea Tiribocchi, Adriano Succi, Sauro |
| author_facet | Lauricella, Marco Montessori, Andrea Tiribocchi, Adriano Succi, Sauro |
| contents | Fluctuating lattice Boltzmann solvers are widely employed to model mesoscopic fluid behavior in soft-matter systems, including colloidal suspensions and dilute polymer solutions. Despite their utility, these methods can lose accuracy and stability when non-hydrodynamic modes interfere with the dynamics, especially in single--relaxation-time schemes. Here, we introduce a ghost-mode filtered fluctuating lattice Boltzmann method (GMF-FLBM) for the D3Q27 lattice, obtained by selectively eliminating the propagation of the ghost deterministic content while preserving the necessary stochastic forcing. We show, over a broad range of relaxation times, that GMF-FLBM recovers the amplitudes of equilibrium fluctuations with a comparable accuracy as a fully regularized high-order formulation, while requiring only minor adjustments to the conventional BGK collision framework. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_03806 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ghost-Mode Filtered Fluctuating Lattice Boltzmann Method Lauricella, Marco Montessori, Andrea Tiribocchi, Adriano Succi, Sauro Soft Condensed Matter Fluid Dynamics Fluctuating lattice Boltzmann solvers are widely employed to model mesoscopic fluid behavior in soft-matter systems, including colloidal suspensions and dilute polymer solutions. Despite their utility, these methods can lose accuracy and stability when non-hydrodynamic modes interfere with the dynamics, especially in single--relaxation-time schemes. Here, we introduce a ghost-mode filtered fluctuating lattice Boltzmann method (GMF-FLBM) for the D3Q27 lattice, obtained by selectively eliminating the propagation of the ghost deterministic content while preserving the necessary stochastic forcing. We show, over a broad range of relaxation times, that GMF-FLBM recovers the amplitudes of equilibrium fluctuations with a comparable accuracy as a fully regularized high-order formulation, while requiring only minor adjustments to the conventional BGK collision framework. |
| title | Ghost-Mode Filtered Fluctuating Lattice Boltzmann Method |
| topic | Soft Condensed Matter Fluid Dynamics |
| url | https://arxiv.org/abs/2601.03806 |