Sensitivity to luminosity, centrifugal force, and boundary conditions in spherical shell convection

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

Organisaatiot

  • NORDITA
  • Stockholm University
  • University of Colorado Boulder

Kuvaus

We test the sensitivity of hydrodynamic and magnetohydrodynamic turbulent convection simulations with respect to Mach number, thermal and magnetic boundary conditions, and the centrifugal force. We find that varying the luminosity, which also controls the Mach number, has only a minor effect on the large-scale dynamics. A similar conclusion can also be drawn from the comparison of two formulations of the lower magnetic boundary condition with either vanishing electric field or current density. The centrifugal force has an effect on the solutions, but only if its magnitude with respect to acceleration due to gravity is by two orders of magnitude greater than in the Sun. Finally, we find that the parameterisation of the photospheric physics, either by an explicit cooling term or enhanced radiative diffusion, is more important than the thermal boundary condition. In particular, runs with cooling tend to lead to more anisotropic convection and stronger deviations from the Taylor-Proudman state. In summary, the fully compressible approach taken here with the Pencil Code is found to be valid, while still allowing the disparate timescales to be taken into account.

Yksityiskohdat

AlkuperäiskieliEnglanti
JulkaisuGEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS
Varhainen verkossa julkaisun päivämäärä15 helmikuuta 2019
TilaSähköinen julkaisu (e-pub) ennen painettua julkistusta - 15 helmikuuta 2019
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 27814469