Some properties of the kinetic energy flux and dissipation in turbulent stellar convection zones

Casey A. Meakin, W David Arnett

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We investigate simulated turbulent flow within thermally driven stellar convection zones. Different driving sources are studied, including cooling at the top of the convectively unstable region, as occurs in surface convection zones; and heating at the base by nuclear burning. The transport of enthalpy and kinetic energy, and the distribution of turbulent kinetic energy dissipation are studied. We emphasize the importance of global constraints on shaping the quasi-steady flow characteristics, and present an analysis of turbulent convection which is posed as a boundary value problem that can be easily incorporated into standard stellar evolution codes for deep, efficient convection. Direct comparison is made between the theoretical analysis and the simulated flow and very good agreement is found. Some common assumptions traditionally used to treat quasi-steady turbulent flow in stellar models are briefly discussed. The importance and proper treatment of convective boundaries are indicated.

Original languageEnglish (US)
Pages (from-to)221-225
Number of pages5
JournalAstrophysics and Space Science
Volume328
Issue number1
DOIs
StatePublished - 2010

Fingerprint

stellar convection
energy dissipation
energy flux
kinetic energy
convection
dissipation
turbulent flow
steady flow
stellar models
stellar evolution
flow characteristics
boundary value problems
enthalpy
cooling
heating
energy

Keywords

  • Convection
  • Stars: interiors
  • Turbulence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Some properties of the kinetic energy flux and dissipation in turbulent stellar convection zones. / Meakin, Casey A.; Arnett, W David.

In: Astrophysics and Space Science, Vol. 328, No. 1, 2010, p. 221-225.

Research output: Contribution to journalArticle

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