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Boundary conditions in CO5BOLD
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
2017 (English)In: Mem.Soc.Astron.Italiana, Vol. 88, p. 12-21Article in journal (Other academic) Published
Abstract [en]

The declaration of boundary conditions is a crucial step in the setup of a CO5BOLD simulation (and many others) due to the physical nature of the problem, that is reflected in the mathematical description by partial differential equations, discrete versions of which are integrated by the numerical solver(s). While parameters controlling the flux of energy through the computational box are most important for all simulations of convective flows, the detailed specifications describing the behavior of energy, gas and dust densities, velocities, and magnetic fields at or just beyond the boundaries influence the flow, dynamics, and stratification within the box. Recent refinements of the treatment of boundary conditions in CO5BOLD resulted in reliably working implementations of open and closed versions for top, bottom, and ``inner'' boundaries even under conditions with strong velocity fields (waves, shocks, or downdrafts). They are implemented and available in the current version of CO5BOLD - but have to be activated properly with parameters adapted to the type of the star under consideration (by defining for instance the depth of the damping layers for the closed-bottom boundary or by specifying the damping constants for the open-bottom boundary).

Place, publisher, year, edition, pages
2017. Vol. 88, p. 12-21
Keyword [en]
Stars: atmospheres, Numerical methods: hydrodynamics
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Astronomy with specialization in Astrophysics
Identifiers
URN: urn:nbn:se:uu:diva-348496OAI: oai:DiVA.org:uu-348496DiVA, id: diva2:1197751
Conference
3rd CO5BOLD Workshop in Napels
Available from: 2018-04-13 Created: 2018-04-13 Last updated: 2018-05-16Bibliographically approved

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Freytag, Bernd

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