Zobrazeno 1 - 10
of 83
pro vyhledávání: '"Friedrich Kupka"'
Publikováno v:
Meteorologische Zeitschrift, Vol 24, Iss 3, Pp 343-358 (2015)
Fluid stratified by gravitation can be subject to a number of instabilities which eventually lead to a flow that causes enhanced mixing and transport of heat. The special case where a destabilizing temperature gradient counteracts the action of a sta
Externí odkaz:
https://doaj.org/article/5271a955601d40a1b32d1f09ce833d11
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 504:3128-3138
We present evolutionary models for solar-like stars with an improved treatment of convection that results in a more accurate estimate of the radius and effective temperature. This is achieved by improving the calibration of the mixing-length paramete
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da5c5181ce817a903bfb7f7266a095ca
https://doi.org/10.1093/mnras/stab1106
https://doi.org/10.1093/mnras/stab1106
Autor:
Florian Zaussinger, Friedrich Kupka
Publikováno v:
Theoretical and Computational Fluid Dynamics. 33:383-409
We present a numerical study of double-diffusive convection characterized by a stratification unstable to thermal convection while at the same time a mean molecular weight (or solute concentration) difference between top and bottom counteracts this i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::86d0092340fa2765b0d54ad60577e91f
https://doi.org/10.1007/s00162-019-00499-7
https://doi.org/10.1007/s00162-019-00499-7
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 646, pp.L5. ⟨10.1051/0004-6361/202040259⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 646, pp.L5. ⟨10.1051/0004-6361/202040259⟩
The use of the full potential of stellar seismology is made difficult by the improper modeling of the upper-most layers of solar-like stars and their influence on the modeled frequencies. Our knowledge on these \emph{surface effects} has improved tha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::362e5b6069da5871d759ae3b6e6f7f70
http://arxiv.org/abs/2101.06065
http://arxiv.org/abs/2101.06065
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 474:4660-4671
We present results of a large, high resolution 3D hydrodynamical simulation of the surface layers of a DA white dwarf (WD) with $T_{\rm eff}=11800$ K and $\log(g)=8$ using the ANTARES code, the widest and deepest such simulation to date. Our simulati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b38b585a2ca09604fa7f498127df13f
https://doi.org/10.1093/mnras/stx3119
https://doi.org/10.1093/mnras/stx3119
Publikováno v:
Journal of Physics: Conference Series. 1623:012016
ANTARES (A Numerical Tool for Astrophysical RESearch) is a multi-purpose numerical tool to solve different variants of the equations of hydrodynamics as they appear in problems of astrophysics, geophysics, and engineering sciences and which require t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0623d0fde991ff39f6c7e6d2756d7d1a
https://doi.org/10.1088/1742-6596/1623/1/012016
https://doi.org/10.1088/1742-6596/1623/1/012016
Publikováno v:
Computer Physics Communications. 188:7-20
We investigate the achievable efficiency of both the time and the space discretisation methods used in Antares for mixed parabolic-hyperbolic problems. We show that the fifth order variant of WENO combined with a second order Runge-Kutta scheme is no
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb7fae39e34ea428007c4b31425abfef
https://doi.org/10.1016/j.cpc.2014.10.009
https://doi.org/10.1016/j.cpc.2014.10.009
Publikováno v:
Journal of Computational and Applied Mathematics. 272:116-140
We construct and analyze robust strong stability preserving IMplicit-EXplicit Runge-Kutta (IMEX RK) methods for models of flow with diffusion as they appear in astrophysics, and in many other fields where equations with similar structure arise. It tu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f6d6f96468e831de0927d3f454f4580d
https://doi.org/10.1016/j.cam.2014.05.011
https://doi.org/10.1016/j.cam.2014.05.011
Publikováno v:
Computer Physics Communications. 185:764-776
We investigate the applicability of curvilinear grids in the context of astrophysical simulations and WENO schemes. With the non-smooth mapping functions from Calhoun et al. (2008), we can tackle many astrophysical problems which were out of scope wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f53cbd1d919add0433bdb3a21f46d31
https://doi.org/10.1016/j.cpc.2013.11.005
https://doi.org/10.1016/j.cpc.2013.11.005