Volume Term Adaptivity for Discontinuous Galerkin Schemes
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arXiv
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| Format: | Preprint |
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2026
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| author | Doehring, Daniel Chan, Jesse Ranocha, Hendrik Schlottke-Lakemper, Michael Torrilhon, Manuel Gassner, Gregor |
| author_facet | Doehring, Daniel Chan, Jesse Ranocha, Hendrik Schlottke-Lakemper, Michael Torrilhon, Manuel Gassner, Gregor |
| contents | We introduce the concept of volume term adaptivity for high-order discontinuous Galerkin (DG) schemes solving time-dependent partial differential equations. Termed v-adaptivity, we present a novel general approach that exchanges the discretization of the volume contribution of the DG scheme at every Runge-Kutta stage based on suitable indicators. Depending on whether robustness or efficiency is the main concern, different adaptation strategies can be chosen. Precisely, the weak form volume term discretization is used instead of the entropy-conserving flux-differencing volume integral whenever the former produces more entropy than the latter, resulting in an entropy-stable scheme. Conversely, if increasing the efficiency is the main objective, the weak form volume integral may be employed as long as it does not increase entropy beyond a certain threshold or cause instabilities. Thus, depending on the choice of the indicator, the v-adaptive DG scheme improves robustness, efficiency and approximation quality compared to schemes with a uniform volume term discretization. We thoroughly verify the accuracy, linear stability, and entropy-admissibility of the v-adaptive DG scheme before applying it to various compressible flow problems in two and three dimensions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_24189 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Volume Term Adaptivity for Discontinuous Galerkin Schemes Doehring, Daniel Chan, Jesse Ranocha, Hendrik Schlottke-Lakemper, Michael Torrilhon, Manuel Gassner, Gregor Numerical Analysis Mathematical Physics 65M60, 65M70, 65M50, 76-04 We introduce the concept of volume term adaptivity for high-order discontinuous Galerkin (DG) schemes solving time-dependent partial differential equations. Termed v-adaptivity, we present a novel general approach that exchanges the discretization of the volume contribution of the DG scheme at every Runge-Kutta stage based on suitable indicators. Depending on whether robustness or efficiency is the main concern, different adaptation strategies can be chosen. Precisely, the weak form volume term discretization is used instead of the entropy-conserving flux-differencing volume integral whenever the former produces more entropy than the latter, resulting in an entropy-stable scheme. Conversely, if increasing the efficiency is the main objective, the weak form volume integral may be employed as long as it does not increase entropy beyond a certain threshold or cause instabilities. Thus, depending on the choice of the indicator, the v-adaptive DG scheme improves robustness, efficiency and approximation quality compared to schemes with a uniform volume term discretization. We thoroughly verify the accuracy, linear stability, and entropy-admissibility of the v-adaptive DG scheme before applying it to various compressible flow problems in two and three dimensions. |
| title | Volume Term Adaptivity for Discontinuous Galerkin Schemes |
| topic | Numerical Analysis Mathematical Physics 65M60, 65M70, 65M50, 76-04 |
| url | https://arxiv.org/abs/2603.24189 |