Beyond the Oberbeck-Boussinesq and long wavelength approximation
arXiv:2207.05427 · doi:10.1088/1741-4326/aca9e0
Abstract
We present the first simulations of a reduced magnetized plasma model that incorporates both arbitrary wavelength polarization and non-Oberbeck-Boussinesq effects. Significant influence of these two effects on the density, electric potential and ExB vorticity and non-linear dynamics of interchange blobs are reported. Arbitrary wavelength polarization implicates so-called gyro-amplification that compared to a long wavelength approximation leads to highly amplified small-scale ExB vorticity fluctuations. These strongly increase the coherence and lifetime of blobs and alter the motion of the blobs through a slower blob-disintegration. Non-Oberbeck-Boussinesq effects incorporate plasma inertia, which substantially decreases the growth rate and linear acceleration of high amplitude blobs, while the maximum blob velocity is not affected. Finally, we generalize and numerically verify unified scaling laws for blob velocity, acceleration and growth rate that include both ion temperature and arbitrary blob amplitude dependence.
References in corpus (12)
- Radial convection of finite ion temperature, high amplitude plasma blobs
- Collisional transport across the magnetic field in drift-fluid models
- Reproducibility, accuracy and performance of the Feltor code and library on parallel computer architectures
- The influence of temperature dynamics and dynamic finite ion Larmor radius effects on seeded high amplitude plasma blobs
- Inertial blob-hole symmetry breaking in magnetised plasma filaments
- Padé-based arbitrary wavelength polarization closures for full-F gyro-kinetic and -fluid models
- Non-Oberbeck-Boussinesq zonal flow generation
- Unified transport scaling laws for plasma blobs and depletions
- Amplitude and size scaling for interchange motions of plasma filaments
- Gyrofluid vortex interaction
- The collisional drift wave instability in steep density gradient regimes
- Interchange instability and transport in matter-antimatter plasmas