dorsal/arxiv
View SchemaGEM -- An Energy Conserving Electromagnetic Gyrofluid Model
| Authors | Bruce D. Scott |
|---|---|
| Categories | |
| ArXiv ID | physics/0501124 |
| URL | https://arxiv.org/abs/physics/0501124 |
| Journal | Physics of Plasmas 12 (2005) 102307 |
Abstract
The details of fluctuation free energy conservation in the gyrofluid model are examined. The polarisation equation relates ExB flow and eddy energy to combinations of the potential and the density and perpendicular temperature. These determine the combinations which must appear under derivatives in the moment equations so that not only thermal free energy but its combination with the ExB energy is properly conserved by parallel and perpendicular compressional effects. The resulting system exhibits the same qualitative energy transfer properties as corresponding Braginskii or Landau fluid models. One clear result is that the numerical model built on these equations is well behaved for arbitrarily large perpendicular wavenumber, allowing exploration of two scale phenomena linking dynamics at the ion and electron gyroradii. When the numerical formulation is done in the globally consistent flux tube model, the results with adiabatic electrons are consistent with the ``Cyclone Base Case'' results of gyrokinetic models.
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"abstract": "The details of fluctuation free energy conservation in the gyrofluid model\nare examined. The polarisation equation relates ExB flow and eddy energy to\ncombinations of the potential and the density and perpendicular temperature.\nThese determine the combinations which must appear under derivatives in the\nmoment equations so that not only thermal free energy but its combination with\nthe ExB energy is properly conserved by parallel and perpendicular\ncompressional effects. The resulting system exhibits the same qualitative\nenergy transfer properties as corresponding Braginskii or Landau fluid models.\nOne clear result is that the numerical model built on these equations is well\nbehaved for arbitrarily large perpendicular wavenumber, allowing exploration of\ntwo scale phenomena linking dynamics at the ion and electron gyroradii. When\nthe numerical formulation is done in the globally consistent flux tube model,\nthe results with adiabatic electrons are consistent with the ``Cyclone Base\nCase\u0027\u0027 results of gyrokinetic models.",
"arxiv_id": "physics/0501124",
"authors": [
"Bruce D. Scott"
],
"categories": [
"physics.plasm-ph"
],
"journal_ref": "Physics of Plasmas 12 (2005) 102307",
"title": "GEM -- An Energy Conserving Electromagnetic Gyrofluid Model",
"url": "https://arxiv.org/abs/physics/0501124"
},
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