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The multi-scale dust formation in substellar atmospheres

Please always quote using this URN: urn:nbn:de:0297-zib-7567
  • Substellar atmospheres are observed to be irregularly variable for which the formation of dust clouds is the most promising candidate explanation. The atmospheric gas is convectively unstable and, last but not least, colliding convective cells are seen as cause for a turbulent fluid field. Since dust formation depends on the local properties of the fluid, turbulence influences the dust formation process and may even allow the dust formation in an initially dust-hostile gas. A regime-wise investigation of dust forming substellar atmospheric situations reveals that the largest scales are determined by the interplay between gravitational settling and convective replenishment which results in a dust-stratified atmosphere. The regime of small scales is determined by the interaction of turbulent fluctuations. Resulting lane-like and curled dust distributions combine to larger and larger structures. We compile necessary criteria for a subgrid model in the frame of large scale simulations as result of our study on small scale turbulence in dust forming gases.

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Metadaten
Author:Christiane Helling, Rupert Klein, Erwin Sedlmayr
Document Type:ZIB-Report
Tag:dust formation; multi-scale problem; substellar atmosphere; turbuelnce
MSC-Classification:30-XX FUNCTIONS OF A COMPLEX VARIABLE (For analysis on manifolds, see 58-XX)
76-XX FLUID MECHANICS (For general continuum mechanics, see 74Axx, or other parts of 74-XX) / 76Fxx Turbulence [See also 37-XX, 60Gxx, 60Jxx] / 76F65 Direct numerical and large eddy simulation of turbulence
76-XX FLUID MECHANICS (For general continuum mechanics, see 74Axx, or other parts of 74-XX) / 76Pxx Rarefied gas flows, Boltzmann equation [See also 82B40, 82C40, 82D05] / 76P05 Rarefied gas flows, Boltzmann equation [See also 82B40, 82C40, 82D05]
85-XX ASTRONOMY AND ASTROPHYSICS (For celestial mechanics, see 70F15) / 85Axx Astronomy and astrophysics (For celestial mechanics, see 70F15) / 85A20 Planetary atmospheres
CCS-Classification:J. Computer Applications / J.2 PHYSICAL SCIENCES AND ENGINEERING
PACS-Classification:90.00.00 GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS (for more detailed headings, see the Geophysics Appendix) / 95.00.00 Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations / 95.30.-k Fundamental aspects of astrophysics (see also section 26 Nuclear astrophysics) / 95.30.Lz Hydrodynamics
90.00.00 GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS (for more detailed headings, see the Geophysics Appendix) / 95.00.00 Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations / 95.30.-k Fundamental aspects of astrophysics (see also section 26 Nuclear astrophysics) / 95.30.Wi Dust processes (condensation, evaporation, sputtering, mantle growth, etc.)
90.00.00 GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS (for more detailed headings, see the Geophysics Appendix) / 97.00.00 Stars (for relativistic stars, see 04.40.Dg in general relativity and gravitation) / 97.82.-j Extrasolar planetary systems / 97.82.Jw Infrared excess; debris disks; protoplanetary disks; exo-zodiacal dust
Date of first Publication:2003/10/31
Series (Serial Number):ZIB-Report (03-34)
ZIB-Reportnumber:03-34
Published in:Appeared in: G. Warnecke (Ed.) Analyse und Numerik von Erhaltungsgleichungen. Berichtsband zum DFG-Schwerpunkt, 2004
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