Revisiting compressible and incompressible pressure-strain interaction in kinetic plasma turbulence
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866912276662976512 |
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| author | Adhikari, Subash Yang, Yan Matthaeus, William H. |
| author_facet | Adhikari, Subash Yang, Yan Matthaeus, William H. |
| contents | In this study, we revisit the pressure-strain interaction in kinetic turbulence, and in particular we re-examine the decomposition of pressure-strain interaction into compressive and incompressive parts. The pressure dilatation ingredient is clearly due to plasma compressions, but here using kinetic particle-in-cell (PIC) simulations of plasma turbulence, it is demonstrated that the remaining anisotropic part, often called Pi-D, also contains contributions due to compressive, non solenoidal velocities of the particle species. The compressive Pi-D can play a significant role in systems with low plasma $β$ even if the system starts with small density variations. The compressive ingredient of Pi-D is found to be anticorrelated with both incompressive Pi-D and pressure dilatation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_11825 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Revisiting compressible and incompressible pressure-strain interaction in kinetic plasma turbulence Adhikari, Subash Yang, Yan Matthaeus, William H. Plasma Physics Space Physics In this study, we revisit the pressure-strain interaction in kinetic turbulence, and in particular we re-examine the decomposition of pressure-strain interaction into compressive and incompressive parts. The pressure dilatation ingredient is clearly due to plasma compressions, but here using kinetic particle-in-cell (PIC) simulations of plasma turbulence, it is demonstrated that the remaining anisotropic part, often called Pi-D, also contains contributions due to compressive, non solenoidal velocities of the particle species. The compressive Pi-D can play a significant role in systems with low plasma $β$ even if the system starts with small density variations. The compressive ingredient of Pi-D is found to be anticorrelated with both incompressive Pi-D and pressure dilatation. |
| title | Revisiting compressible and incompressible pressure-strain interaction in kinetic plasma turbulence |
| topic | Plasma Physics Space Physics |
| url | https://arxiv.org/abs/2503.11825 |