On the relevance of bubbles and potential flows for stellar convection
| Autor: | Achim Weiss, Wasilij Barsukow, M. M. Miller Bertolami, Vincent Prat, Maxime Viallet |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Convection
Bubble Computation Ciencias Físicas fundamental parameters [stars] FOS: Physical sciences Fundamental parameters of stars 01 natural sciences Evolution of stars Physics::Fluid Dynamics purl.org/becyt/ford/1 [https] Simple (abstract algebra) 0103 physical sciences Relevance (information retrieval) stars: evolution 14. Life underwater 010306 general physics 010303 astronomy & astrophysics Stellar evolution Solar and Stellar Astrophysics (astro-ph.SR) convection Physics Astronomy and Astrophysics purl.org/becyt/ford/1.3 [https] Astronomía Classical mechanics Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science evolution [stars] Stellar physics Potential flow stars: fundamental parameters CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| Popis: | Recently Pasetto et al. have proposed a new method to derive a convection theory appropriate for the implementation in stellar evolution codes. Their approach is based on the simple physical picture of spherical bubbles moving within a potential flow in dynamically unstable regions, and a detailed computation of the bubble dynamics. Based on this approach, the authors derive a new theory of convection which is claimed to be parameter-free, non-local and time-dependent. This is a very strong claim, as such a theory is the holy grail of stellar physics. Unfortunately, we have identified several distinct problems in the derivation which ultimately render their theory inapplicable to any physical regime. In addition, we show that the framework of spherical bubbles in potential flows is unable to capture the essence of stellar convection, even when equations are derived correctly. Facultad de Ciencias Astronómicas y Geofísicas Instituto de Astrofísica de La Plata |
| Databáze: | OpenAIRE |
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